Mercedes-Benz models 204, 207and 212 may experience steering lock (ESL/ELV) failures, causing no-start issues. This guide outlines two replacement methods, with Method 2 (direct data calculation and writing it into ELV by APPRO2 APP2) recommended for safety.
Replacement Methods
Method 1: Erase & Synchronize Lock Data
Steps:
1. Retrieve the key code.
2. Save the original lock EIS data (includes key password).
3. Erase the lock data and clear TP protection.
4. Write back the saved EIS data to the new lock.
5. Synchronize data to the steering lock (ESL).
6. Insert the working key to activate.
Disadvantage: Risk of lock damage if data erasure fails.
Method 2: Direct Data Calculation (Recommended)
Steps:
1. Retrieve the key code.
2. Save the original EIS data (includes key password).
3. Upload EIS data to the server to calculate ESL sync data.
4. Erase the new steering lock and clear TP protection.
5. Write the calculated ESL data to the lock.
6. Insert the working key to activate.
Advantage: Safer, avoids lock damage from erasure.
Notes
1. Blank Lock Requirement: Ensure the new steering lock is erased and writable before synchronization.
2. Lock Status: Verify "Initialized,""Personalized," and "Activated" flags in the tool interface.
3. Simulator Use:
Simulators must be erased before reuse.
Check stored passwords to confirm successful personalization.
4. Activation: Insert the working key after writing data to complete personalization.
Troubleshooting
No Ignition? Verify key codes match between EIS and ESL.
Locked CPU? Repair or replace the ELV module if empty/personalized operations fail.
Conclusion:
For reliable Mercedes-Benz steering lock replacement, Method 2 with APPRO APP2 Key Programmer is the safer choice. Always ensure proper tool connectivity (OBD-K adapter) and follow status checks to avoid errors.
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