Keyless Starting System: Description and Operation

Access/Start Authorization


When disconnecting and connecting the battery, always perform the work procedure as described in the repair manual. Refer to => [ Battery, Disconnecting and Connecting ] Battery, Disconnecting and Connecting. Not adhering to sequence will result in the deactivation of Main Battery Switch -E74- and subsequent damage to electrical system components.

• Access/Start Authorization Switch (E415) (starter switch) with integrated lock cylinder is one unit and can only be replaced completely.

• If Access/Start Authorization Control Module (J518) is replaced, work sequence=> [ Access/Start Authorization Control Module, Replacing ] Access/Start Authorization Control Module, Replacing must be performed.

General Description

Access/Start Authorization Switch (E415) possesses an electronic terminal control.

Anti-Theft Engine Disable Sensor (D1) and Ignition Switch Key Lock Solenoid (N376) are integrated in Access/Start Authorization Switch and cannot be replaced separately.

All malfunctions in relation to Access/Start Authorization Switch are output via Access/Start Authorization Control Module (J518).

For this vehicle, the ignition key removal lock is enabled electro-mechanically.

• To remove ignition key in vehicles with automatic transmission, always shift selector lever into position "P" and then switch off ignition. Otherwise the Ignition Switch Key Lock Solenoid (N376) prevents removal of the ignition key (ignition key removal lock)!

Ignition key removal lock ensures that ignition key is secured against unintentional removal.

Ignition key removal lock can be checked via output Diagnostic Test Mode (DTM) of Access/Start Authorization Control Module (J518). Refer to => [ Access/Start Authorization Control Module, Output Diagnostic Test Mode ] Access/Start Authorization Control Module, Output Diagnostic Test Mode.

DTC Recognition and Display

Access/start authorization is equipped with On Board Diagnostics (OBD) which assists troubleshooting.

For troubleshooting, use Vehicle Diagnostic, Testing and Information System (VAS 5051A) in operating mode "Guided Fault Finding".

Access/Start Authorization Button (E408)

The access/start authorization button allows the vehicle to be started without actively using the ignition key.