Ignition switch Mercedes-Benz W124 with automatic transmission
Location:
* To the right of the steering column, under the dashboard.
Functions:
* Turn on/off the ignition
* Lock/unlock steering shaft
* Engine starting system control
Components:
* Lock cylinder
* Ignition key
* Contact group
* Transponder (chip key)
* Immobilizer
Job:
1. Inserting the key: The ignition key is inserted into the lock cylinder.
2. Turning the key: The key turns from the “Lock” to “Start” position, passing through intermediate positions:
* “Off” – turn off the ignition
* “Acc” – switch on accessories (radio, headlights)
* “On” – turn on the ignition
* “Start” – engine start
3. Starting the engine: If the key is turned to the “Start” position, the contact group supplies power to the starter, which starts the engine.
4. Removing the key: After starting the engine, the key can be turned back to the “Off” position and removed from the lock.
Additional features (for some models):
* Steering Shaft Lock: When the key is removed from the lock, the steering shaft is locked, preventing unauthorized use of the vehicle.
* Transponder: The chip key contains a transponder that communicates with the vehicle’s immobilizer. If the transponder code does not match the code stored in the immobilizer, the engine will not start.
Maintenance Tips:
* Regularly lubricate the ignition switch with a special lock lubricant.
* Avoid using excessive force when inserting or turning the key.
* Do not leave the key in the ignition when leaving the vehicle.
* If you have problems with the ignition switch, contact a qualified service technician.