Key Identification and Start Procedure

Key identification and start procedure
The following procedure takes place after inserting the vehicle key in the ignition lock:

The transponder in the key is powered via the loop antenna and sends the key data to the EWS3 control unit.

- The EWS3 control unit then checks the key data to ensure it is correct and only then sends an enable signal to the engine management system and starter.
- After the engine has started, the EWS3 control unit generates new key data (change code) and transfers them to the transponder in the key.
- A new variable code is also created and stored in the DME/DDE control unit.