Central Locking

E36 vehicles can be central locked or unlocked from both front doors or from the trunk. Double locking is only possible from the driver's door, but unlocking from double lock is possible from both front doors. The valet key will not unlock the glove box or the trunk (if the trunk lock is in the valet position).





If the vehicle is locked from the trunk and the key is removed in the horizontal position, the trunk will remain locked when unlocking the doors.


The central locking module receives input signals from the doorlock pin contact switches, trunk lock pin contact switch, and driver's door microswitch (double lock only). The central locking module controls the operation of the door lock actuators, truck lock motor, and fuel filler lock motor through three relays (internal to the module): one each for locking, unlocking, and double locking.





In the event of an accident while driving with the doors locked, the crash sensor input will cause the ZVM to unlock all doors and turn on the interior lights and 4-way flashers.


In addition to the reduction of electrical circuitry, the following features of the

E36 Central Locking System represent improved features:

- Locking button are uncoupled from the latch mechanism when double lock is activated.
- A double locked vehicle can be unlocked from the passenger side.
- In the event of electrical failure, mechanical override only requires turning the key to the unlock position.


The central lock/double lock circuit is protected against overloads or short circuits by electronic power protection. The power protection circuit is an integral part of the ZVM, and monitors current flow in the locking system by means of a comparator and measuring resistor. The locking system is switched off if current flow exceeds 30 amps for 0.3 seconds, or if current flow exceeds 50 amps at any time.

More detailed information is available in the E36 Electrical Troubleshooting Manual in the following sections.

Schematics: 5126.2
Diagnostic Procedures: 5126.2A