# Central locking description

Features

| Locking and unlocking of entire car from both front door cylinders and trunk cylinder
| Electrically operated lock motors
| Automatic unlocking in case of accident
| Separate locking and unlocking of individual doors.
| Deadbolt over ride from drivers door cylinder only ( Late models only)

The locking mechanism is operated by miniature motors in relation to the direction in which the key is turned.

Central locking is also possible from inside the car by pressing down the lock button on the drivers door. Pressing down the lock button for other doors will cause mechanical locking of that door only. The central locking system of the car can only be operated from the front passenger's door with the key. With this feature , it is virtually impossible to be locked out unintentionally.

Locking the car from the drivers door is accomplished by the reported position of the drivers door lock motor to the control unit.

Locking of the front passenger's door is accomplished with a microswitch, which is operated by a cam on the door lock cylinder and triggers the electric system.

After locking the car, the system can be unlocked from any locking point, either front door or trunk, provided the deadlock feature has not been engaged. In a deadlock situation, only the drivers door cylinder will release the locks.

The lock on the drivers door is designed to prevent operation of the lock system if all doors are not closed.

The central locking system will unlock via an impact switch in the control unit, in approximately 800 ms for an emergency situation, such as an accident. The system resets automatically after such a situation

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson