2 Series F22/F23 (Coupe/Cabrio)

BMW EWS3 2001-2006 AKL

BMW EWS3 AKL Procedure Guide

2001-2006

CRITICAL INFORMATION

OBD Programming: EWS3 does NOT support All Keys Lost programming via OBD. Bench work is mandatory.

Module Removal Required: You must remove the EWS3 module from the vehicle and read data on the bench.

MCU Types:

0D46J - Can be read via K-line adapter (safer method)

2D47J - Requires MCU adapter, risk of memory erasure during read

Vehicle Coverage: BMW E36, E38, E39, E46, E53 (X5), Z4, Mini Cooper, Range Rover (2001-2006)

Transponder Chip: PCF7935 or PCF7930/PCF7931

GENERAL AKL PROCEDURE (All Tools)

Phase 1: Module Identification & Removal

1. Verify EWS3 System

Check production year (2001-2006)

Locate EWS3 module (typically behind glove box or under dash)

Note module part number

2. Remove EWS3 Module

Disconnect battery negative terminal

Remove module mounting screws

Disconnect connector carefully

Document connector orientation

3. Identify MCU Type

Open EWS3 module housing

Locate processor chip

Read mask number on chip (0D46J or 2D47J)

Phase 2: Data Reading

For 0D46J (Recommended Method):

Connect via K-line adapter to module connector

No MCU removal required

Read EEPROM data

Always read 2-3 times and verify consistency

For 2D47J (Caution Required):

Use dedicated 2D47J adapter

Never attempt K-line read on 2D47J (will erase memory)

Provide external 12V power

Read carefully - erasure risk exists

4. Save Original Dump

Create backup of original EEPROM data

Verify file integrity

Store securely for future reference

Phase 3: Key Programming

5. Analyze EEPROM Data

Load dump into key programming software

Verify VIN matches vehicle

Check existing key positions (typically positions 1-8)

Confirm password data is present

6. Prepare Dealer Key

Select unused key position (e.g., Position 4 or 5)

Place blank PCF7935 transponder in programming coil

Execute "Make Dealer Key" or equivalent function

Verify successful programming

7. Cut Key Blade

Use key code from EEPROM or decode existing key

Cut physical blade to match

Phase 4: Installation & Testing

8. Reinstall EWS3 Module

Reconnect module to vehicle

Secure mounting

Reconnect battery

9. Test Key

Insert programmed key

Turn to position II (ignition on)

Verify immobilizer light behavior

Attempt engine start

Confirm successful start

TOOL-SPECIFIC PROCEDURES

VVDI2 (Xhorse)

Required Hardware:

VVDI2 Commander

BMW Function License

VVDI Prog with EWS3 adapter OR external programmer

Procedure:

Connect EWS3 to VVDI Prog using EWS3 adapter

Launch VVDI2 software → BMW Programmer

Select "Read EWS3 EEPROM"

Save dump file to PC

Go to "Get Key Info" → "Lost All Key"

Place blank PCF7935 in coil

Select key position → "Prepare dealer key with programmer"

Confirm key programming successful

Notes: VVDI2 can read via programmer or external EEPROM dump. For 0D46J, K-line reading is supported. For 2D47J, use adapter method only.

Autel IM608 / IM508

Required Hardware:

Autel IM608 or IM508 tablet

XP400 Pro key programmer

APB114 EWS3 adapter board (part of IMKPA accessories)

12V power supply

Procedure:

Remove EWS3 from vehicle

Connect APB114 adapter to EWS3

Connect adapter to XP400 Pro

Provide external 12V power

Navigate: IMMO → BMW → EWS → EWS3 K-line 0D46J

Select "Read"

Save EEPROM dump

Select "Key Learning" → "All Keys Lost"

Follow on-screen prompts

Insert blank transponder in XP400 Pro

Select key position and write key

Verify programming complete

Notes: IM608/IM508 requires APB114 adapter for EWS3. Connection diagram displayed on screen. For 2D47J, adapter method required.

Xtool X100 Pad3 / Pad Elite

Required Hardware:

X100 Pad3 or Pad Elite tablet

KC100 key programmer adapter

External EEPROM programmer (AK90+, Xprog, or similar)

Procedure:

Read EWS3 D-FLASH/EEPROM with external programmer

Save dump file to tablet via USB or cloud

Connect X100 Pad3 to vehicle via OBD (for coding only)

Navigate: Immobilizer → BMW → EWS

Select "Read Keys Info" (if needed)

Connect KC100 adapter

Place blank PCF7935/PCF7930 in KC100 coil

Select "Write Start Key"

Load saved EEPROM dump file

Choose unused key position

Execute key writing

Verify dealer key generation success

Notes: X100 Pad3 does NOT read EWS3 directly - external programmer required first. KC100 used only for key writing. Not OBD-capable for EWS3 reading.

OBDSTAR X300 DP Plus

Required Hardware:

X300 DP Plus tablet (C Package recommended)

P001 programmer with adapters

Procedure:

Remove EWS3 module

Connect appropriate adapter for 0D46J or 2D47J

Navigate: IMMO → BMW → EWS

Read EEPROM data

Save dump file

Select key programming function

Place blank transponder in coil

Follow guided procedure

Write key to selected position

Notes: X300 DP Plus has limited EWS3 support compared to newer CAS systems. Verify specific EWS3 capability in latest software version. P001 programmer kit required.

ABRITES AVDI

Required Hardware:

AVDI interface with active subscription

ZN055 ABPROG EWS3 adapter

ABPROG programmer

ZN002 or ZN003 PROTAG key programmer

Procedure:

Remove EWS3 module from vehicle

Open EWS3 housing to access PCB

Connect ABPROG with ZN055 EWS3 adapter

Launch ABRITES software → BMW

Select EWS3 programming function

Read EEPROM data via K-line (0D46J) or adapter (2D47J)

Save data file

Navigate to key programming

Use PROTAG to prepare PCF7935 transponders

Program keys to selected positions

Verify programming successful

Notes: ABRITES requires annual subscription. PROTAG separately prepares transponders. ZN055 adapter connects ABPROG to EWS3 module. Professional-grade system with extensive BMW coverage.

Smart Pro (Advanced Diagnostics)

Required Hardware:

Smart Pro tablet

Smart Aerial

ADC2000 cable (for BMW connection)

Tokens or software modules

Note: Smart Pro primarily focuses on CAS2/CAS3/CAS3+ systems for BMW. EWS3 support is limited. For EWS3 AKL, consider using dedicated EWS programmers in conjunction with Smart Pro's CAS capabilities. Verify current EWS3 coverage with manufacturer before attempting procedure.

Xhorse Key Tool Plus

Required Hardware:

Key Tool Plus tablet

VVDI Mini Prog or VVDI Prog

XDNP50 EWS3 adapter (for Mini Prog) OR VVDI Prog EWS3 adapter

Blank PCF7935 transponders

Procedure:

Remove EWS3 from vehicle

Connect EWS3 to Mini Prog using XDNP50 adapter

Read EEPROM and save dump

Upload file to Key Tool Plus (via USB or cloud)

On Key Tool Plus: Immo Data Tool → Europe → BMW → EWS3

Load saved dump file

Review key information and positions

Select unused key position (Position 4, 5, etc.)

Place blank PCF7935 in Key Tool Plus coil

Tap "Prepare Dealer Key"

Select chip type: PCF7930/PCF7931/PCF7935

Wait for "Dealer key success" confirmation

Cut blade using Key Tool Plus or separate machine

Notes: Key Tool Plus combines functions of VVDI2, Key Tool Max, and programming capabilities. Mini Prog required for EWS3 reading. Can also work with AK90+ or other external programmers. Files can be transferred via USB or cloud storage.

TECHNICAL NOTES

EWS3 Module Specifications

Module Types:

Hardware versions: HW1, HW2, HW3

Software versions: SW1 through SW8

Processor masks: 0D46J (newer), 2D47J (older)

Key Positions: EWS3 supports up to 8 keys (positions 0-7)

Password System: Internal password for key synchronization and DME communication

Common Issues & Solutions

Problem: Failed to read 2D47J

Solution: Ensure proper adapter connection, provide stable 12V power, lift specific pins if required

Problem: "Wrong changing code" error

Solution: EWS-key synchronization issue. May require editing EWS file or programming new key with correct password

Problem: Module erased during read

Solution: If 2D47J memory lost, use EWS Factory Reset function and rebuild with DME data

Problem: Car cranks but won't start

Solution: Check EWS-DME synchronization, verify password matching between modules

Safety Precautions

Always read EEPROM data 2-3 times and verify consistency

Never write corrupted or mismatched data back to EWS3

Keep original dumps stored securely

For 2D47J, never attempt K-line reading - use proper adapter

Ensure stable power supply during all operations

Verify VIN matches before programming keys

Professional Tips

Document all connector orientations with photos before removal

Label all saved files clearly with VIN and date

Test programmed keys before final reassembly

Keep backup of working dump files

Consider DME synchronization requirements for full functionality

ADDITIONAL RESOURCES

For questions regarding specific tool compatibility or procedure variations, consult your tool manufacturer's latest documentation or technical support. BMW immobilizer systems are continuously evolving, and software updates may add new capabilities or change existing procedures.

This guide is for professional automotive locksmiths and technicians with appropriate training and equipment.

BMW CAS3&3+ 2006-2013 AKL

BMW CAS3/CAS3+ All Keys Lost (AKL) - Quick Professional Guide

⚠️ CRITICAL SAFETY WARNINGS

POWER SUPPLY MANDATORY: Use 12V battery maintainer at 13.5-14.2V throughout entire procedure. 85% of CAS failures are from voltage drops.

NEVER INTERRUPT POWER: Power loss during programming permanently damages CAS ($400-1,200 repair).

BACKUP FIRST: Always create CAS backup before starting - your only recovery option.

Vehicle Identification

CAS3 (2006-2009 E-Series)

Processor: 9S12XDP512 / 9S12HZ256

Models: E60, E61, E70, E71, E81, E82, E87, E88, E90, E91, E92, E93

ISN: Optional for most tools

Part Numbers: 9147xxx, 9166xxx

CAS3+ (2009-2012 E-Series)

Processor: 9S12XEP100

Models: Late E60/E90 facelift, E84 X1

ISN: Recommended but often not required

Part Numbers: 9187xxx, 9217xxx

Required Equipment

Programming tool (VVDI2, Xhorse Key Tool Plus, Autel IM608, Lonsdor K518, OBDSTAR G3)

12V battery maintainer (3A minimum)

Blank BMW key (ID46/PCF7942 for CAS3, PCF7945/Hitag2 for CAS3+)

Key cutting equipment

Correct frequency: 315MHz (USA), 433/868MHz (Europe)

METHOD 1: OBD PROGRAMMING (Recommended - 30-60 minutes)

Using XHORSE Key Tool Plus

Step 1: Connect & Setup (5 min)

Connect battery maintainer - verify 13.5V+

Connect Key Tool Plus to OBD port

Tap "IMMO Programming" → "Europe" → "BMW"

Select "Automatically diagnose models"

Verify CAS3/CAS3+ detected correctly

Step 2: Read Key Information (3 min)

Tap "Generate keys via OBD"

Tap "Read key information"

If connection fails: Press brake pedal 3x or activate hazards

Note available key positions (shows "FFFFFFFF Enable")

Step 3: Create Backup (5 min) ⚠️ MANDATORY

Tap "Backup CAS Data"

Enter filename: VIN_DATE_CAS3_BACKUP

Wait for completion (2-4 minutes)

Verify backup saved successfully

Export to cloud storage/email

Step 4: Unlock CAS (5 min) ⚠️ CRITICAL

Verify battery maintainer shows 13.5V+

Tap "Unlock CAS3/CAS3+"

Confirm backup created

Tap "Start Unlock"

DO NOT TOUCH ANYTHING - process takes 3-7 minutes

Wait for "Unlock Successful" message

PHOTOGRAPH security keys displayed (write them down)

Step 5: Program Key (8 min)

Prepare blank key (correct chip, blade cut)

Tap "Prepare dealer key with ignition switch"

Select empty key position (shows "FFFFFFFF")

Select "Unencrypted" version

Position key:

Keyless: Place near START/STOP button

Traditional: Insert in ignition (OFF position)

Tap "Start Programming"

Wait 5-8 minutes for completion

Success message: "Key learn success"

Step 6: Verify & Test (5 min)

Tap "Read key information" - verify position now shows "Enable"

Remove key and test remote (lock/unlock)

Insert key and turn ignition ON (don't start yet)

Wait 15 seconds (critical for sync)

Start engine - should crank immediately

Let run 30 seconds

Test all functions (remote, trunk, engine start/stop)

Step 7: Synchronize Remote (if needed)

Start engine and drive forward 30+ seconds

Press lock/unlock while driving

Or use Key Tool Plus "Synchronize Keys" function

Using VVDI2

Step 1: Connect & Setup (5 min)

Connect battery maintainer - verify 13.5V+

Connect VVDI2 to OBD and laptop via USB

Launch VVDI2 Commander software

Click "BMW" → "CAS3/CAS3+" → "OBD Mode"

Click "Read CAS Info" to verify detection

Step 2: Backup CAS Data (8 min) ⚠️ MANDATORY

Click "Create Backup" or "Read CAS Data"

Wait for reading (4-7 minutes)

Save as: VIN_DATE_CAS3_BACKUP.bin

Click "Verify Backup" to confirm integrity

Copy backup to multiple locations

Step 3: Unlock CAS (10 min) ⚠️ CRITICAL

Verify laptop on AC power, battery maintainer at 13.5V+

Click "Unlock CAS3/CAS3+"

Read all warnings carefully

Confirm backup created

Click "Start Unlock"

DO NOT INTERRUPT - takes 5-10 minutes

Process stages:

Connection → Authentication → Reading → Flash Update (2-4 min - most critical) → Verification

Wait for "Unlock Successful" message

SCREENSHOT security keys displayed

Step 4: Program Key (12 min)

Prepare blank key (correct chip, blade cut)

Click "Program Dealer Key"

Select empty position (shows "FFFFFFFF" or "Empty")

Choose "Standard Mode" (or "Secure Mode" if using ISN)

Position key:

Keyless: Near emergency coil

Traditional: Insert in ignition (OFF)

Click "Start Programming"

Wait for stages:

Key Detection → Calculate Data → Write CAS → Write Chip → Verify

Total time: 8-12 minutes

Success message appears

Step 5: Test Key (5 min)

Remove key and test remote functions

Insert key, turn ignition ON

Wait 15 seconds before starting

Start engine - should crank immediately

Let idle 30 seconds

Drive 30+ seconds if remote doesn't work (auto-sync)

Using Autel IM608

Step 1: Connect (5 min)

Connect battery maintainer at 13.5V+

Connect IM608 to OBD

Tap "IMMO" → "BMW" → Select year/model → "CAS3/CAS3+"

Step 2: Backup & Unlock (10 min)

Tap "All Keys Lost"

Tap "Read CAS Data" - auto-saves backup (5-12 min)

Tap "Continue" to unlock

DO NOT INTERRUPT during flash update

Wait for "Unlock Successful"

Step 3: Program Key (8 min)

Tap "Program Key"

Select empty key slot

Insert key or use XP400 simulator

Follow on-screen prompts

Wait for completion

Test all functions

Using Lonsdor K518

Step 1: Connect (5 min)

Connect battery maintainer at 13.5V+

Connect K518 to OBD

Select "Immobilizer" → "BMW" → "CAS3/CAS3+"

Step 2: Backup & Unlock (8 min)

Select "All Keys Lost"

K518 reads and backs up CAS data automatically

Follow prompts for unlock procedure

Wait for completion (don't interrupt)

Step 3: Program Key (8 min)

Select "Add Key"

Choose empty position

Insert key in K518 card slot or position near vehicle coil

K518 programs automatically

Wait for "Success" message

Test key functions

Using OBDSTAR G3

Step 1: Connect (5 min)

Connect battery maintainer at 13.5V+

Connect OBDSTAR to OBD

Select "Immobilizer" → "BMW" → "CAS3/CAS3+"

Step 2: Backup & Unlock (10 min)

Select "All Keys Lost" function

Device reads CAS and creates backup

Follow unlock prompts

Wait for completion

Step 3: Program Key (8 min)

Select "Add New Key"

Choose key position

Position key as directed

Wait for programming completion

Test all functions

METHOD 2: BENCH PROGRAMMING (When OBD Fails)

When to Use Bench Method

OBD unlock failed

CAS damaged/unresponsive via OBD

Enhanced security variant

ISN required and must read from DME

CAS Removal (60-90 min)

Location: Bottom left of steering wheel area

Removal Steps:

Disconnect battery negative terminal

Remove dashboard panels to access CAS:

Center LCD screen cover

Right air outlet

Trim panels

AC control panel

Photograph all connectors before removal

Disconnect CAS connectors (press release tabs)

Remove mounting bolts

Extract CAS carefully - place in anti-static bag

Using Lonsdor K518 (Bench Method)

Step 1: Read CAS EEPROM (20 min)

Use VVDI Prog or similar to read CAS EEPROM

Identify chip type (95128/95256)

Connect appropriate adapter

Read EEPROM and save as .BIN file

Save backup: VIN_CAS3_EEPROM.bin

Step 2: Program with K518 (15 min)

Copy EEPROM file to K518 "customfile" folder

On K518: "Immobilizer" → "BMW" → "CAS3/CAS3+"

Select "Make Dealer Key"

Choose imported EEPROM file

Enter ISN if prompted (32-digit hex from DME)

Insert blank key in K518 card slot

K518 programs automatically (2-3 min)

"Generate key success" message appears

Step 3: Reinstall CAS (30 min)

Reconnect all CAS connectors (match photos)

Install mounting bolts

Reassemble dashboard panels

Reconnect battery

Test key: Start engine, wait 15 seconds, test all functions

Using VVDI2 (Bench Method)

Step 1: Connect CAS to Test Platform (10 min)

Place CAS on GODIAG test platform

Connect adapters according to pinout

Connect 12V bench power supply (13.5V)

Connect platform to VVDI2

Launch VVDI2 software

Step 2: Backup & Unlock (15 min)

Select BMW → CAS3/CAS3+ → Bench Mode

Click "Read CAS Data" - save backup

Click "Unlock CAS3/CAS3+"

Wait for completion (safer on bench than in vehicle)

Record security keys displayed

Step 3: Program Key (12 min)

Enter ISN if prompted

Click "Program Dealer Key"

Select key position

Place blank key on test platform coil

Click "Start Programming"

Wait for completion

Test key on platform before reinstalling CAS

Step 4: Reinstall (30 min)

Disconnect bench setup

Reinstall CAS in vehicle (reverse of removal)

Reconnect battery

Test key functions

ISN Reading (If Required)

Most CAS3 systems work WITHOUT ISN

Some CAS3+ variants may require ISN

Option 1: OBD Reading (Rarely Works)

Try via programming tool

Usually fails on E-series

If successful, ISN displays automatically

Option 2: DME Bench Reading (Advanced)

Remove DME from vehicle (location varies by model)

Use VVDI Prog + appropriate DME adapter

Read ISN from DME EEPROM (32-digit hex)

Takes 20-30 minutes

Or use professional ISN service ($150-300, 24-48 hrs)

Option 3: Continue Without ISN

Most CAS3 procedures work fine without ISN

Key will function fully (immobilizer + remote)

Troubleshooting

"Cannot Connect to CAS"

Check battery voltage (must be 12.5V+)

Press brake pedal 3x or activate hazards

Verify OBD cable secure

Try different USB port

"Unlock Failed"

Restore from backup immediately

Check power supply stable at 13.5V+

Update tool software

Try bench method instead

"Key Programs But Won't Start Engine"

Verify ISN entered correctly (if used)

Delete key and reprogram

Check key frequency matches vehicle

Perform synchronization procedure

"Remote Doesn't Work"

Start engine and drive 30+ seconds (auto-sync)

Use tool's "Synchronize Remote" function

Press each button multiple times while engine running

"CAS Damaged/Unresponsive"

Restore from backup file

Use tool's "CAS Repair" function

Professional CAS repair may be needed ($200-400)

Key Programming Tips

✅ Always

Connect battery maintainer at 13.5V+ throughout

Create backup before any changes

Wait 15 seconds during first engine start

Test all functions before finishing

Save security keys displayed after unlock

❌ Never

Interrupt power during programming

Skip backup step

Start engine immediately (wait 15 seconds)

Use wrong chip type or frequency

Force connections or keys

Time Estimates

OBD Method

Xhorse Key Tool Plus: 45-60 min

VVDI2: 50-70 min

Autel IM608: 40-60 min

Lonsdor K518: 45-65 min

OBDSTAR G3: 50-70 min

Bench Method

CAS removal: 60-90 min

Programming: 30-60 min

Reinstallation: 30-60 min

Total: 2-4 hours

Additional Keys

Repeat programming steps for each additional key

Use different key positions (1, 2, 3, etc.)

Maximum 10 keys per CAS3/CAS3+

Each additional key: 8-12 minutes

BMW CAS4&4+ 2011-2014 AKL

BMW CAS4/CAS4+ All Keys Lost (AKL) - Complete Step-by-Step Procedure

⚠️ CRITICAL SAFETY WARNINGS

READ THESE BEFORE STARTING - FAILURE TO FOLLOW CAUSES MODULE DAMAGE

POWER SUPPLY IS MANDATORY: Connect a 12V battery maintainer delivering stable 13.5-14.2V throughout the ENTIRE procedure. Vehicle battery alone is NOT sufficient. 90% of CAS corruption failures result from voltage drops during programming.

NEVER INTERRUPT POWER: Once programming begins, any power interruption can permanently damage the CAS module ($500-1,500 repair cost).

BACKUP BEFORE STARTING: Always create complete CAS backup before any modifications. This is your only recovery option if something goes wrong.

CAS4+ REQUIRES ISN: You MUST obtain the 32-digit ISN code from the engine ECU before starting CAS4+ programming. Without it, the procedure will fail.

Pre-Procedure Verification & Preparation

Step 1: Identify Your CAS Type

Connect diagnostic tool to vehicle OBD port and read CAS information:

CAS4 Identifiers:

Processor: 9S12XDP512 (1L15Y) or 9S12XEP100 (5M48H/1N35H)

Found in: 2010-2012 F-series BMW

ISN Status: Sometimes works without DME ISN (but recommended)

CAS4+ Identifiers:

Processor: 9S12XEP100 with EWS5 encryption

Found in: 2012+ F-series BMW

ISN Status: MANDATORY - must read from DME/DDE

Common F-Series Models with CAS4/CAS4+:

5-Series: F07, F10, F11, F18

6-Series: F06, F12, F13

7-Series: F01, F02, F04

X3: F25

Step 2: Gather Required Equipment

Essential Items (All Methods):

Programming tool (VVDI2, XHORSE Key Tool Plus, Autel IM608, Lonsdor K518, or OBDSTAR)

12V battery maintainer (minimum 3A capacity)

Laptop/tablet for tool operation

OBD-II cable compatible with your tool

Multimeter to verify voltage

Blank BMW key (correct frequency: 315MHz USA, 433/434/868MHz Europe)

ESD wrist strap and anti-static mat

Additional for Bench Method:

EEPROM programmer (VVDI Prog recommended)

BMW CAS4/CAS4+ adapter cables

GODIAG CAS4/CAS4+ Test Platform (highly recommended)

Panel removal tools and trim pry tools

12V bench power supply

Storage containers for screws/parts

Step 3: Document Vehicle Information

Record the following BEFORE starting:

Complete VIN number

Current mileage

CAS part number and software version

Key frequency (from CAS data or vehicle spec plate)

Any existing fault codes

Take photos of dashboard and vehicle condition

METHOD 1: OBD PROGRAMMING (Fastest - When Supported)

⚠️ COMPATIBILITY WARNING

CAS4: OBD method works with most tools (XHORSE, Autel, some configurations)

CAS4+: Limited OBD support - most require bench method for AKL

Risk Level: Higher risk if power fails during unlock process

XHORSE Key Tool Plus - OBD Procedure

Step 1: Setup and Connection (5 minutes)

Ensure vehicle battery is fully charged (12.5V minimum)

Connect battery maintainer to vehicle battery - verify 13.5V+ output

Turn ignition to OFF position

Connect XHORSE Key Tool Plus to vehicle OBD port

Power on Key Tool Plus tablet

Verify stable connection indicator

Step 2: Access BMW Programming Menu (2 minutes)

On Key Tool Plus main screen, tap "IMMO Programming"

Select "Europe" region

Select "BMW"

Choose "Automatically diagnose models"

Wait for auto-detection to complete (30-60 seconds)

System will display: CAS4 or CAS4+ identification

Step 3: Read Current Key Information (3 minutes)

Select "Generate keys via OBD"

Tap "Read key information"

If connection fails:

Press brake pedal 3 times rapidly

OR activate hazard lights

Wait 10 seconds and retry connection

System displays:

All key positions (1-10)

Enabled/Disabled status for each position

Software version

Ignition switch status

Step 4: Create Complete Backup (3 minutes)

THIS IS YOUR SAFETY NET - DO NOT SKIP

Select "Backup CAS Data" from menu

Enter descriptive filename: VIN_DATE_CAS4_BACKUP

Save to Key Tool Plus storage

Wait for "Backup Successful" confirmation

Verify backup file exists before proceeding

Step 5: Unlock CAS4/CAS4+ (CRITICAL STEP - 2-5 minutes)

warning">⚠️ DO NOT TOUCH ANYTHING DURING THIS PROCESS

Tap "Continue" then "Unlock CAS4/CAS4+"

Read ALL warning messages carefully

Verify battery maintainer voltage is 13.5V+

Tap "Start Unlock"

Screen will show progression:

Connected

Security login

Flash updating (DO NOT TOUCH - 1-2 minutes)

Programming session

Writing coding

Success message appears: "CAS4/CAS4+ unlock success"

If unlock fails:

DO NOT retry immediately

Restore from backup file

Check all connections

Verify power supply voltage

Consider switching to bench method

Step 6: Record Security Information (2 minutes)

System now displays critical data - WRITE THIS DOWN:

CAS4/CAS4+ security key: [16-digit hex]

DME/CAS security key: [16-digit hex]

Key/CAS security key: [16-digit hex]

ECU ISN: [32-digit hex]

Take a photograph of this screen for backup documentation

Step 7: Program New Key (5 minutes)

Select "Prepare dealer key with ignition switch"

Choose an unused key position (shows "FFFFFFFF Enable")

Example: If positions 1-2 were used, select position 3

System asks: "Use encrypted or unencrypted version?"

Select "Unencrypted" for standard procedure

Prepare your blank key:

For keyless entry: Place key near START/STOP button area

For standard ignition: Insert key into ignition switch

Tap "Start Programming"

Wait for preprocessing (1-2 minutes)

Screen shows: "Preprocessing key data..."

Key learning begins automatically

Screen shows: "Writing key data to CAS..."

Progress bar displays

Success message: "Key learn success"

Step 8: Verify Programming (2 minutes)

Tap "Read key information" again

Verify your selected position now shows:

Status: "Enable"

Ignition switch: Recognizes key

Check that position is no longer showing "FFFFFFFF"

Step 9: Test Key Functions (3 minutes)

Test in this exact order:

Remove key from ignition (if inserted)

Test remote lock button - doors should lock with confirmation sound

Test remote unlock button - doors should unlock

Test trunk/boot release (if equipped)

Insert key in ignition OR press START/STOP

Dashboard should illuminate normally

All warning lights should behave normally

Attempt engine start

Engine should crank and start normally

Allow engine to run for 30 seconds

Test key removal - should remove smoothly

Step 10: Final Synchronization (if needed) (5 minutes)

If remote functions don't work:

Start engine with new key

Drive vehicle forward slowly for 30+ seconds

Remote should synchronize automatically during movement

Test lock/unlock buttons while driving

If still not working:

Return to Key Tool Plus menu

Select "Synchronize Keys"

Place key near emergency coil (steering column right side)

Follow on-screen prompts

success">✅ TOTAL TIME: 30-45 MINUTES

METHOD 2: BENCH PROGRAMMING (Safest - Always Works)

✅ ADVANTAGES

Complete control over programming environment

No risk of damaging CAS while installed in vehicle

Can test on bench platform before reinstalling

Safer for CAS4+ and complex scenarios

⏱️ TIME REQUIRED: 2.5-6 hours (depending on experience)

Phase 1: CAS Module Removal (45-90 minutes first time)

Step 1: Prepare Vehicle and Workspace (10 minutes)

Park vehicle in well-lit, clean workspace

Disconnect battery negative terminal

Wait 5 minutes for system power-down

Gather all tools and storage containers

Put on ESD wrist strap

Prepare camera for documentation photos

Step 2: Dashboard Disassembly (30-60 minutes)

warning">⚠️ Take photos at EVERY step for reassembly reference

CAS4/CAS4+ is located bottom left of steering wheel area

Remove center LCD screen cover:

Locate 2 screws on each side

Remove screws and carefully pull cover forward

Disconnect any electrical connectors

Set aside with screws labeled

Remove right side air outlet:

Gently pry with trim tool at edges

Work around perimeter

Pull straight out when loose

Set aside

Remove peach wood trim panel (if equipped):

Locate 8 internal nuts (may be T20 or T25 Torx)

Remove all nuts carefully

Pull panel forward gently

Disconnect any lighting connectors

Set aside with hardware

Remove small cover plates:

Located at sides of AC control panel

Gently pry with trim tool

Set aside

Remove AC control panel:

Locate 4 mounting screws

Remove screws

Pull panel forward carefully

Disconnect all electrical connectors (note positions)

Set aside with screws labeled

Access CAS4/CAS4+ module:

Now visible in lower left area

Note mounting bracket configuration

Photograph module position and all connectors

Step 3: CAS Module Extraction (15-20 minutes)

Identify all connectors attached to CAS:

Typically 2-3 large multi-pin connectors

Photograph each connector before removal

Note connector colors and positions

Disconnect connectors carefully:

Press release tabs fully before pulling

Pull connectors straight out (don't twist)

Never force - verify release tab is fully depressed

Set connectors aside in safe location

Remove CAS mounting hardware:

Typically 2-3 bolts or screws

Keep hardware with module

Note bracket orientation

Extract CAS module:

Carefully slide module from mounting bracket

Avoid touching circuit board components

Place in anti-static bag immediately

Step 4: DME/DDE Removal for ISN Reading (30-45 minutes)

warning">⚠️ ONLY if you don't already have ISN - CAS4+ REQUIRES THIS

DME location varies by model:

Most F-series: Engine bay, near firewall

Some models: Under passenger floor panel

Consult model-specific documentation

General DME removal steps:

Disconnect battery (if not already done)

Locate DME based on model

Remove any covers or protective panels

Photograph DME position and all connectors

Disconnect all electrical connectors (note positions)

Remove mounting bolts

Extract DME carefully

Place in anti-static bag

Phase 2: EEPROM Reading and ISN Extraction (30-60 minutes)

Step 5: Setup Bench Programming Station (10 minutes)

Clear clean workspace

Place ESD-safe mat on work surface

Connect 12V bench power supply

Setup EEPROM programmer (VVDI Prog or equivalent)

Verify all connections before applying power

Have laptop ready with programming software

Step 6: Read CAS EEPROM Data (20-30 minutes)

Using VVDI Prog (most common method):

Identify CAS chip type:

Open CAS module carefully

Locate EEPROM chip (usually 95128 or 95256)

Note chip markings

Connect CAS to VVDI Prog:

Use appropriate BMW CAS4 adapter (XDNP12 or equivalent)

Match adapter pins to CAS module pins according to pinout diagram

Double-check all connections before applying power

Connect VVDI Prog to laptop via USB

Read EEPROM data:

Launch VVDI Prog software

Select BMW → CAS4/CAS4+

Choose appropriate chip type

Click "Read"

Wait for read operation to complete (2-5 minutes)

Verify data is not all FF or all 00 (indicates read error)

Save EEPROM file:

Save as .BIN format (critical for compatibility)

Filename: VIN_CAS4_EEPROM_DATE.bin

Save to multiple locations (backup)

Verify file size is correct (typically 1KB-4KB)

Step 7: Read DME/DDE ISN (20-30 minutes)

warning">⚠️ MANDATORY FOR CAS4+ - STRONGLY RECOMMENDED FOR CAS4

Using VVDI Prog for DME ISN reading:

Identify DME type:

Common F-series types: MSV80, MSV90, MSD80, MSD81, MSD85, MEVD17.2.x

Check DME label for part number

Connect DME to programmer:

For MEVD17.2.9 (N20/B38 engines): Use XDNP37/38/39 adapters

For MSV80/90: Use appropriate adapter

Consult VVDI Prog documentation for specific DME pinouts

Connect programmer to laptop

Enter programming mode:

Launch VVDI Prog software

Select BMW ISN DME function

Choose your specific DME type from list

Click "Connect"

Read ISN:

Click "Read ISN"

Software enters programming session

Wait for ISN extraction (5-10 minutes)

ISN displays as 32-digit hexadecimal code

Example: 0F 1E 2D 3C 4B 5A 69 78 87 96 A5 B4 C3 D2 E1 F0

Save ISN securely:

Write down ISN immediately - triple-check accuracy

Save ISN file from software

Add to password-protected document

Store in multiple secure locations

Alternative ISN reading methods:

Yanhua Mini ACDP: Excellent for various DME types, no-solder adapters

Autohex II: Boot mode ISN reading for supported DME types

Professional ISN service: Mail DME to specialist ($150-300, 24-48 hour turnaround)

Phase 3: Key Programming on Bench (15-30 minutes)

Using Lonsdor K518 (Most Common Bench Method)

Step 8A: Import EEPROM to K518 (5 minutes)

Connect K518 to computer via USB

Open K518 device in file explorer

Navigate to "customfile" folder

Copy your CAS EEPROM .bin file to this folder

Safely disconnect K518

Power on K518 and verify file appears in device menu

Step 9A: Program Key with K518 (10-15 minutes)

On K518 main screen, select "Immobilizer"

Choose "BMW"

Select "Select from type"

Choose "CAS4" or "CAS4+" as appropriate

Select "Make Dealer Key"

Choose your imported EEPROM file from customfile folder

System displays vehicle information:

VIN number

CAS part number

Current mileage

Key tooth code

Remote frequency

Diagnostic codes

Enter ISN code:

System prompts: "Please input 32-bit ISN"

Carefully enter the ISN obtained from DME

Triple-check each character - errors cause failure

Confirm ISN entry

Insert blank key:

Push key blade into K518 card slot (right side)

Push slot shell right to lock

K518 identifies chip type automatically

Verify chip is recognized

Program key:

K518 begins programming automatically

Progress bar displays (1-3 minutes)

Wait for "Generate key success" confirmation

Remove programmed key

Step 10A: Test Key on Bench (Optional but Recommended)

If you have GODIAG CAS4/CAS4+ Test Platform:

Connect CAS module to test platform

Connect 12V bench power supply (13.5V)

Place programmed key near platform coil

Press test platform start button

Verify CAS recognizes key (indicator lights)

This confirms programming before vehicle installation

Using XHORSE Key Tool Plus (Bench Method)

Step 8B: Connect CAS to Test Platform (10 minutes)

Place CAS module on GODIAG CAS4/CAS4+ Test Platform

Connect CAS connectors to test platform adapters

Connect test platform to Key Tool Plus via special cable

Connect 12V bench power supply to test platform

Power on Key Tool Plus

Step 9B: Program via Bench (15-20 minutes)

On Key Tool Plus, select "IMMO Programming"

Choose "Europe → BMW"

Select "Bench Programming Mode"

Choose "CAS4/CAS4+"

System detects CAS on test platform

Select "Read CAS Data" and create backup

Select "Unlock CAS" (similar to OBD procedure but safer)

Enter ISN when prompted (if CAS4+)

Select "Program New Key"

Choose unused key position

Place blank key on test platform coil

System programs key (2-5 minutes)

Success confirmation appears

Test key recognition on platform before vehicle installation

Using VVDI2 (Bench Method)

Step 8C: Connect CAS to Test Platform (10 minutes)

Prepare VVDI2 bench setup:

Place CAS module on GODIAG CAS4/CAS4+ Test Platform

Connect CAS connectors to test platform adapters according to pinout diagram

Ensure proper alignment of all pins

Connect power and communications:

Connect 12V bench power supply to test platform

Verify voltage output is 13.5-14.0V before connecting to CAS

Connect GODIAG platform to VVDI2 using BMW bench cable

Connect VVDI2 to laptop via USB cable

Power up system:

Turn on 12V power supply first

Launch VVDI2 software on laptop

Power on VVDI2 device

Verify green connection indicator on VVDI2

Verify communications:

Software should detect VVDI2 device

Check that bench connection mode is active

Ensure stable connection before proceeding

Step 9C: Read and Backup CAS Data (10 minutes)

Access BMW functions in VVDI2:

In VVDI2 software main menu, click "BMW"

Select "CAS4/CAS4+" from module list

Choose "Bench Mode" connection type

Software initializes bench communication

Read current CAS data:

Click "Read CAS Data" button

VVDI2 establishes programming session

Progress bar shows data reading (2-4 minutes)

DO NOT interrupt during reading process

Create complete backup:

When read completes, click "Save Backup"

Enter descriptive filename: VIN_CAS4_VVDI2_BACKUP_DATE

Choose save location (multiple backup locations recommended)

Verify file saved successfully

CRITICAL: Check backup file size is reasonable (typically 512KB-1MB)

Verify backup integrity:

Click "Verify Backup" if option available

Software confirms backup is readable and complete

Note down any displayed security information

Step 10C: Unlock CAS4/CAS4+ on Bench (5-10 minutes)

warning">⚠️ CRITICAL STEP - Ensure power stability throughout

Prepare for unlock:

Verify 12V power supply shows steady 13.5V+

Ensure laptop is connected to AC power (not battery)

Close all unnecessary programs on laptop

Have backup file location noted for quick recovery if needed

Initiate unlock procedure:

In VVDI2 BMW menu, click "Unlock CAS4/CAS4+"

Software displays warning messages - READ CAREFULLY

Confirm you have created backup

Click "Start Unlock" to proceed

Unlock process stages:

Initializing security session (30 seconds)

Authenticating with CAS (1 minute)

Erasing protection zones (1-2 minutes) - DO NOT INTERRUPT

Writing new unlock data (1-2 minutes)

Verifying unlock status (30 seconds)

Finalizing and coding (30 seconds)

Unlock completion:

Software displays: "CAS4/CAS4+ unlock successful"

Security keys are displayed on screen

PHOTOGRAPH THIS SCREEN - contains critical data:

CAS security key (16 digits hex)

DME/CAS security key (16 digits hex)

Key/CAS security key (16 digits hex)

System ISN (if readable)

Click "Save Security Data" to file

Store this file securely with backup

If unlock fails:

Software will display specific error message

DO NOT retry immediately

Click "Restore Backup" to return CAS to original state

Check all connections and power supply

Verify CAS module is not damaged

Consider contacting VVDI2 technical support before retry

Step 11C: Load ISN into VVDI2 (2 minutes)

warning">⚠️ MANDATORY FOR CAS4+ - Strongly recommended for CAS4

Access ISN input:

In VVDI2 BMW CAS menu, locate "ISN Management" section

Click "Enter ISN" or "Load ISN" button

Input ISN code:

If you read ISN from DME with VVDI Prog:

Click "Import ISN File"

Browse to ISN file location

Select file and click Open

VVDI2 loads ISN automatically

If you have manual ISN code:

Click "Enter ISN Manually"

Type the complete 32-digit hexadecimal ISN

Format: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

Triple-check each digit - errors cause programming failure

Click "Confirm ISN"

Verify ISN acceptance:

Software validates ISN format

Displays: "ISN loaded successfully"

ISN appears in programming menu

Write down ISN as additional backup

Step 12C: Program Dealer Key (8-12 minutes)

Access key programming function:

In VVDI2 BMW menu, click "Program Dealer Key"

System displays available key positions (1-10)

Shows which positions are enabled/disabled

Shows which have existing keys

Select key position:

Choose an unused key position showing "Empty" or "FFFFFFFF"

Example: If positions 1 and 2 are used, select position 3

Click selected position to highlight

Software confirms: "Position X selected for programming"

Prepare key for programming:

Take your blank BMW key

If using test platform coil:

Place key on GODIAG platform coil area

Position key blade pointing toward platform center

Ensure key sits flat against coil

If using VVDI2 key card slot:

Insert key chip directly into VVDI2 card reader slot

Push until chip makes contact

LED indicates chip detected

Initiate key programming:

Click "Start Key Programming" button

VVDI2 prompts: "Place key near coil or insert in reader"

Confirm key is in position

Click "Continue"

Key programming sequence:

Detecting key chip type (15 seconds)

Software displays detected chip: Usually "Hitag2" or "PCF7945"

Confirm chip type is correct

Preprocessing key data (1-2 minutes)

Progress bar shows: "Calculating key data..."

Writing key to CAS memory (2-3 minutes)

Progress bar shows: "Programming key position X..."

Writing key chip data (1-2 minutes)

System writes immobilizer data to key transponder

Verifying key programming (30 seconds)

Software reads back programmed data

Syncing key data (30 seconds)

Programming completion:

Software displays: "Key programming successful!"

Shows programmed key details:

Key position number

Key chip ID

Programming date/time

Click "Save Programming Log" (recommended)

Verify programming in CAS memory:

Click "Read Key Information" in VVDI2 menu

Software reads current CAS key positions

Your programmed position should now show:

Status: "Enabled"

Ignition: "Recognized"

Chip ID: [displays chip serial]

If position shows "Disabled" or "Not Programmed", repeat procedure

Step 13C: Test Key on Bench Platform (5 minutes)

warning">⚠️ HIGHLY RECOMMENDED - Verifies programming before vehicle installation

Prepare bench test:

Ensure CAS still connected to test platform

Verify 12V power supply still active

Keep VVDI2 connected for monitoring

Test key recognition:

Remove programmed key from coil/reader

Hold key near test platform emergency coil area (usually marked)

Press platform "Test Start" button (if equipped)

Expected results:

Platform LED illuminates (key detected)

VVDI2 software shows "Key recognized by CAS"

Relay click sound (if platform has relay)

Test key functions on platform:

Immobilizer test:

Platform simulates ignition on

CAS should authenticate key

No fault codes should appear

Remote function test (if platform supports):

Press key remote lock button

Press key remote unlock button

Platform indicators show signals received

Verify key data in VVDI2:

Click "Test Key Communication" in BMW menu

Software attempts to communicate with key via CAS

Displays: "Key communication: OK"

Shows key encryption status

Final bench verification:

Click "Read CAS Data" once more

Verify no new fault codes generated

Confirm key position remains "Enabled"

Save final bench test report

If bench test fails:

Key doesn't respond on platform

Delete key from CAS using VVDI2

Reprogram key using same procedure

Verify ISN was entered correctly

Check key chip isn't damaged

Try different blank key

If bench test succeeds:

✅ Key is correctly programmed

✅ Safe to disconnect CAS from bench

✅ Ready for vehicle reinstallation

✅ High confidence of success in vehicle

Step 14C: Disconnect and Prepare for Installation (5 minutes)

Save final data:

In VVDI2, click "Save Session Log"

Creates complete record of all operations

Save to project folder with all other files

Include in customer documentation

Power down safely:

Close VVDI2 software

Turn off 12V bench power supply

Disconnect VVDI2 USB cable

Disconnect bench cables from CAS

Prepare CAS for installation:

Visually inspect CAS for any damage

Verify all connector pins are straight and undamaged

Ensure no foreign objects in connectors

Place CAS in anti-static bag for transport to vehicle

Organize programmed key:

Label programmed key: "Position X - Programmed [Date]"

Keep separate from any blank keys

Have key ready for synchronization procedure

Using Autel IM608 with XP400 Pro (Bench Method)

Step 8D: Connect CAS to XP400 Pro (10 minutes)

Connect CAS to appropriate XP400 Pro adapter

Connect XP400 Pro to IM608 tablet

Connect 12V bench power supply

Power on IM608

Step 9D: Program with IM608 (15-20 minutes)

On IM608, select "IMMO"

Choose "BMW"

Select "Bench Mode" or "CAS Adapter"

Choose "CAS4/CAS4+ Programming"

Select "Read CAS Data" - creates automatic backup

Choose "All Keys Lost" function

Enter ISN when system prompts (mandatory for CAS4+)

Select "Program Dealer Key"

Choose unused key position

Connect blank key to XP400 Pro key slot OR place on induction coil

Tap "Start Programming"

Wait for completion (2-5 minutes)

"Key programming successful" message appears

Phase 4: Module Reinstallation (30-60 minutes)

Step 10: Prepare for Reinstallation (5 minutes)

Verify key programming was successful

Ensure CAS module is clean and undamaged

Review all installation photos taken during removal

Organize all hardware and connectors

Verify battery maintainer is ready for connection

Step 11: Install CAS Module (15-20 minutes)

Carefully position CAS in mounting bracket:

Align module exactly as documented in photos

Slide into bracket smoothly

Do not force

Install mounting hardware:

Hand-tighten bolts first to verify alignment

Tighten to finger-tight plus 1/4 turn

Do not overtighten (can crack housing)

Reconnect all electrical connectors:

Refer to removal photos for correct positions

Align connector pins carefully

Push firmly until click is heard/felt

Verify locking tabs engage

Gently tug each connector to confirm secure connection

Step 12: Dashboard Reassembly (20-30 minutes)

Reverse of disassembly - refer to photos at each step:

Reinstall AC control panel:

Reconnect all electrical connectors first

Position panel in opening

Install 4 mounting screws

Verify panel sits flush

Reinstall small cover plates at AC panel sides

Reinstall peach wood trim panel:

Reconnect any lighting connectors

Position panel carefully

Install 8 internal nuts

Verify alignment before fully tightening

Reinstall right side air outlet:

Press firmly into position

Verify clips engage

Reinstall center LCD cover:

Reconnect any electrical connectors

Position cover

Install 2 screws each side

Final inspection:

Check all panels for proper fit

Verify no gaps or misalignment

Ensure no tools or parts left in vehicle

Check that all trim pieces are secure

Step 13: Electrical Reconnection (5 minutes)

Connect battery maintainer to battery (DO NOT connect battery terminals yet)

Verify maintainer shows 13.5V+ output

Reconnect battery positive terminal - tighten securely

Reconnect battery negative terminal - tighten securely

DO NOT start vehicle yet - wait for system initialization

Phase 5: Key Synchronization and Testing (10-20 minutes)

Step 14: Initial System Check (5 minutes)

Remove all other keys from vehicle (if any exist)

Place newly programmed key in ignition OR hold near START/STOP

Press START button once (do not start engine yet)

Dashboard should illuminate normally

Check for warning lights:

✅ Normal: Standard warning lights (airbag, ABS, etc.)

⚠️ Problem: "Key not detected" or steering lock warning

Step 15: Key Synchronization (5-10 minutes)

Critical synchronization procedure:

Insert key in ignition OR hold key near START/STOP

Press START button to crank engine

Wait exactly 15 seconds even if dashboard illuminates before

Count slowly: "One thousand one, one thousand two..."

This wait period is MANDATORY for proper synchronization

Engine should start normally

Let engine run for 30 seconds minimum

If engine doesn't start:

Check for fault codes with diagnostic tool

Verify ISN was entered correctly

Ensure key position shows "Enable" in CAS memory

Try synchronization procedure again

Step 16: Remote Function Synchronization (5 minutes)

If remote buttons don't work initially:

With engine running, drive vehicle forward slowly

Movement triggers automatic synchronization

Drive for 30+ seconds

Press lock button multiple times while driving

Press unlock button multiple times

Remote should synchronize within 15-20 seconds

Test all remote functions

Alternative sync method if driving doesn't work:

Turn ignition off

Remove key from vehicle

Use programming tool's "Synchronize Keys" function:

Connect tool to OBD

Select BMW → CAS4/CAS4+ → Synchronize Keys

Place key near emergency coil (right side steering column)

Follow tool's on-screen prompts

Test remote functions after sync completes

Step 17: Comprehensive Function Testing (5 minutes)

Test EVERY function before returning vehicle:

✅ Remote lock button - doors lock, mirrors fold (if equipped)

✅ Remote unlock button - doors unlock, interior lights activate

✅ Trunk/boot release button - trunk opens

✅ Panic button - horn and lights activate

✅ Key insertion (if applicable) - smooth operation

✅ Engine start - cranks and starts immediately

✅ Engine run - runs smoothly with no warnings

✅ Dashboard indicators - all normal operation

✅ Key removal - removes smoothly without resistance

✅ Door lock/unlock from inside - operates normally

✅ Windows - operate normally (not locked out)

Verify no new fault codes:

Connect diagnostic tool

Read all modules for fault codes

Clear any registration-related codes (normal after programming)

Verify no critical faults remain

Step 18: Final Documentation (5 minutes)

Create service record including:

Date and time of service

Vehicle VIN and mileage

CAS part number and software version

ISN used (store securely)

Key position programmed

Any issues encountered and resolutions

Total service time

Customer signature acknowledging completed work

success">✅ BENCH METHOD TOTAL TIME: 2.5-6 HOURS

Troubleshooting Common Problems

Problem 1: "Cannot Connect to CAS" via OBD

Possible causes and solutions:

Low battery voltage:

Check voltage with multimeter

Must be 12.5V minimum, 13V+ preferred

Connect battery maintainer

Communication module in sleep mode:

Press brake pedal 3 times rapidly

OR activate hazard lights

Wait 10 seconds and retry connection

Faulty OBD cable or connection:

Check OBD connector pins for damage

Try different USB port on laptop

Test with known-good OBD cable

Wrong vehicle protocol selected:

Ensure tool is set to automatic detection

Try manual selection of BMW protocol

If all else fails: Switch to bench programming method

Problem 2: ISN Read Fails from DME

Solutions by method:

OBD ISN Reading:

Most F-series require factory mode or boot mode - OBD rarely works

Verify tool has ISN reading license activated

Check all adapter connections are secure

Try alternative reading method

Bench ISN Reading:

Verify correct DME type selected in software

Check adapter pinout matches DME model

Ensure stable 12V power supply to DME

Try boot mode instead of programming mode

Consider professional ISN reading service ($150-300)

Problem 3: Key Programs Successfully but Engine Won't Start

Most common cause: Incorrect ISN

Diagnosis and repair:

Verify ISN accuracy:

Re-check all 32 digits of ISN code

Compare against original ISN file

Look for transposed digits

Delete and reprogram key:

Connect programming tool

Delete newly programmed key position

Clear all ISN data from CAS

Re-enter CORRECT ISN

Program key again

Check key frequency:

Wrong frequency (315MHz vs 433MHz) causes recognition issues

Verify key matches vehicle specification

Obtain correct frequency blank

Verify key position status:

Read CAS memory

Ensure position shows "Enable" not "Disabled"

Check ignition switch recognizes key

Synchronization issue:

Perform manual synchronization procedure

Wait full 15 seconds during initial start attempt

Drive vehicle if synchronization hasn't occurred

Problem 4: Remote Functions Don't Work After Programming

Immobilizer works but remote fails - common issue

Solutions:

Automatic synchronization:

Start engine with new key

Drive vehicle forward 30+ seconds

Remote should sync automatically

Test lock/unlock buttons

Manual synchronization:

With engine running, press each button 3-5 times

Lock button first

Then unlock button

Then trunk/boot release

Functions should activate after repeated presses

Tool-based synchronization:

Use programming tool's sync function

Place key near emergency coil

Follow on-screen procedure

Usually takes 1-2 minutes

Delete and reprogram:

If sync fails repeatedly

Delete key from CAS

Reprogram with sync option enabled

Test immediately after programming

Problem 5: CAS Unresponsive After Programming Attempt

Critical failure - immediate action required

Recovery steps:

DO NOT disconnect power yet

DO NOT attempt to start vehicle

Check battery voltage - should be 13V+

Attempt to re-establish communication:

Try different programming tool if available

Try bench connection instead of OBD

Restore from backup:

Connect tool that created backup

Select "Restore CAS backup"

Choose backup file created before programming

Write backup to CAS

Wait for completion

If backup restore fails:

Some tools have CAS recovery functions:

CGDI BMW: "CAS Fix" function

Yanhua ACDP: Auto-recovery mode

VVDI2: CAS repair function

Follow tool-specific recovery procedure

Last resort - professional repair:

If all recovery attempts fail

CAS requires professional repair service

Cost typically $200-500

Turnaround time 1-5 days

Problem 6: Terminal 15 Deactivated Error

Symptoms: Vehicle electrical systems don't activate, "Terminal 15" fault code

Recovery:

Read fault codes first

Restore from backup immediately

Clear all fault codes after restoration

If no backup exists:

Use tool's Terminal 15 activation function

CGDI BMW has specific fix for this

May require professional CAS repair

Problem 7: Power Loss During Programming

If power interruption occurs:

Restore power IMMEDIATELY

Reconnect battery

Reconnect maintainer

DO NOT disconnect programming tool

Attempt to restore from backup

If CAS becomes unresponsive, follow Problem 5 recovery steps

Key Programming Tips

✅ Always

Connect battery maintainer at 13.5V+ throughout

Create backup before any changes

Wait 15 seconds during first engine start

Test all functions before finishing

Save security keys displayed after unlock

Verify ISN accuracy before programming

❌ Never

Interrupt power during programming

Skip backup step

Start engine immediately (wait 15 seconds)

Use wrong chip type or frequency

Force connections or keys

Attempt programming without stable power supply

Time Estimates

OBD Method

Xhorse Key Tool Plus: 30-45 min

VVDI2: 35-50 min

Autel IM608: 30-45 min

Bench Method

CAS removal: 45-90 min

DME ISN reading: 30-45 min

Programming: 30-60 min

Reinstallation: 30-60 min

Total: 2.5-6 hours

Additional Keys

Repeat programming steps for each additional key

Use different key positions (1, 2, 3, etc.)

Maximum 10 keys per CAS4/CAS4+

Each additional key: 10-15 minutes

BMW FEM-BDC 2014-2020 AKL

Universal BMW FEM/BDC All Key Lost (AKL) Procedure Guide

This guide provides a comprehensive, tool-agnostic approach to BMW FEM/BDC All Key Lost procedures that can be adapted for any professional programming system (Autel IM608, CGDI BMW Pro, AutoHex II, VVDI2, etc.).

Pre-Work Preparation and Safety

1. Vehicle Assessment and Documentation

Verify vehicle identification: Record VIN, model year, and exact F/G-series designation

Identify module type: Determine if vehicle uses FEM, BDC, or BDC2 system

Check tool compatibility: Confirm your programming tool supports the specific module version

Document original state: Photograph all connector positions, fuse locations, and dash warnings

2. Safety Protocol Implementation

Disconnect battery: Remove negative terminal and wait minimum 15 minutes

Prepare ESD protection: Use anti-static wrist strap and grounded work surface

Set up stable power supply: Ensure 12-15V source capable of sustained 2-5 amp delivery

Clear workspace: Remove all unnecessary items and ensure clean, organized environment

3. Required Equipment Verification

Programming tool with BMW FEM/BDC support

EEPROM programmer or clips (model-specific)

BMW FEM/BDC test platform

Stable power supply (12-15V, 2-5A minimum)

Anti-static equipment

Backup storage for original files

Phase 1: ISN Code Retrieval

Step 1: DME Module Access

Locate DME module: Typically in engine bay or behind glove compartment

Remove DME safely: Disconnect connectors and document positions

Connect to programming tool: Use appropriate adapters for your specific tool

Establish communication: Verify stable connection before proceeding

Step 2: ISN Extraction

Navigate to DME functions: Access immobilizer or security section in your tool

Read ISN data: Extract the Individual Serial Number (32-digit code for most models)

Verify data integrity: Confirm complete and accurate ISN retrieval

Create multiple backups: Save ISN data in multiple locations for security

Step 3: ISN Validation

Check format: Ensure ISN follows expected pattern for vehicle model

Document thoroughly: Record ISN along with vehicle and tool information

Prepare for synchronization: ISN will be used to program FEM/BDC module

Phase 2: FEM/BDC Module Preparation

Step 4: Module Location and Removal

Locate module: FEM typically in A-pillar area, BDC varies by model

Document connections: Photograph all connectors before disconnection

Remove carefully: Handle module gently to prevent physical damage

Transport safely: Use anti-static bag for module transport

Step 5: EEPROM Access Method Selection

Choose based on your tool capabilities:

Option A: Clip Connection (Preferred)

Identify EEPROM chip (usually M95128 for FEM, M95256 for BDC)

Clean chip surface with appropriate solvent

Attach EEPROM clip ensuring proper pin alignment

Verify stable electrical connection

Option B: Soldering Method (If Required)

Apply flux to chip pins

Solder fine wires to appropriate pins

Ensure clean connections without bridges

Test continuity before proceeding

Step 6: Original Data Backup

Read EEPROM completely: Extract all data from chip

Verify read integrity: Ensure clean, complete data capture

Create multiple backups: Save original files with clear naming convention

Document chip details: Record chip type, size, and any identifying marks

Phase 3: Module Modification and Programming

Step 7: EEPROM Data Modification

Method varies by tool - follow your specific software procedures:

Load original EEPROM data into your programming software

Apply tool-specific modifications: Enable programming mode per your tool's requirements

Verify modifications: Ensure changes are correct before writing

Prepare modified file: Save modified EEPROM data for programming

Step 8: Programming Mode Activation

Write modified data: Program modified EEPROM file to chip

Verify write operation: Confirm successful programming

Test module response: Check if module enters programming mode

Troubleshoot if needed: Address any communication issues

Step 9: ISN Synchronization and Key Programming

Connect to test platform: Mount module on BMW test platform

Establish tool communication: Connect programming tool via OBD

Enter programming sequence: Navigate to key programming functions

Input ISN data: Synchronize DME ISN with FEM/BDC

Program new keys: Follow tool-specific key programming procedure

Verify programming success: Confirm keys are properly programmed

Phase 4: Restoration and Testing

Step 10: Module Restoration

Write original EEPROM: Restore original data to return module to normal operation

Verify restoration: Ensure original data is properly written

Test basic functions: Check module communication and basic operations

Prepare for installation: Clean connections and prepare module for vehicle

Step 11: Vehicle Installation and Testing

Reinstall module: Return module to original vehicle location

Reconnect all connectors: Ensure proper seating and secure connections

Reconnect battery: Restore power and initialize systems

Test all functions: Verify complete key and vehicle functionality

Step 12: Final Verification

Test key operations: Start engine, lock/unlock doors, check all key functions

Verify dashboard: Ensure no immobilizer or security warnings

Check comfort features: Test windows, mirrors, seat memory if applicable

Document completion: Record successful procedure and key information

Tool-Specific Adaptations

For Autel IM608 Users

Use G-Box2 for DME connection

Utilize XP400 Pro for EEPROM operations

Follow IM608 BMW immobilizer programming sequence

Use APA103 clips for no-solder EEPROM access

For CGDI BMW Pro Users

Use CG100 programmer for EEPROM operations

Leverage CGDI's module recovery capabilities

Utilize dealer key generation functions

Follow CGDI BMW software programming sequence

For AutoHex II Users

Select appropriate unlocking method (ISN, working key, or reset)

Use 8-pin clip connection system

Follow AutoHex module repair procedures

Utilize gateway and body programming functions

For VVDI2 Users

Use VVDI2 BMW functions for key programming

Combine with VVDI Prog for EEPROM operations

Follow VVDI2 immobilizer programming sequence

Use flash repair functions if needed

Critical Success Factors

Power Management

Maintain stable voltage: Voltage fluctuations can corrupt programming

Use quality power supplies: Cheap supplies cause most failures

Monitor current draw: Excessive current indicates problems

Data Integrity

Verify all reads: Bad reads lead to non-functional modules

Maintain backups: Original data is your safety net

Check file sizes: Truncated files indicate read problems

Communication Stability

Ensure clean connections: Poor connections cause communication failures

Use quality cables: Cheap cables introduce errors

Minimize interference: Keep workspace free of electrical noise

Troubleshooting Common Issues

Communication Failures

Check power supply stability

Verify cable connections

Ensure proper grounding

Try different communication speeds

Programming Failures

Verify ISN data accuracy

Check EEPROM modification correctness

Ensure stable power during programming

Confirm tool compatibility with module version

Module Recovery

Use original EEPROM backup to restore

Try different programming tools if available

Consider professional repair services for severe damage

Check for physical damage to module or chip

Post-Procedure Considerations

Customer Education

Explain any warranty implications

Discuss future serviceability limitations

Provide information about key replacement procedures

Document service for future reference

Professional Standards

Maintain detailed service records

Follow legal requirements for key programming

Ensure proper customer verification and authorization

Provide appropriate service guarantees

Important Warnings

BDC2/BDC3 Limitations

Many procedures result in permanent modifications

Future dealer programming may be prevented

Enhanced security makes procedures more complex

Success rates vary significantly by tool and experience

Legal Considerations

Verify customer ownership before proceeding

Follow local laws regarding key programming

Maintain proper business licensing and insurance

Document authorization for all services