Fuel Tank Access Flap Lock Motor

Central Locking

The central-locking system is controlled by the general module 5.

The central locking drives in the vehicle doors are integrated in the system lock and facilitate locking, arming and unlocking of the doors.

In additional, the following flaps and compartments are locked and unlocked by means of the central-locking drives:
E46 Sedan, Coupe, Sport Wagon: fuel tank flap
E46 Convertible: fuel tank flap and glove compartment
E52 Z8: glove compartment and storage shelf in center console
E83 X3: fuel tank flap
E85 Z4: fuel tank flap and storage shelf (with soft top cover)

Functions

General
A differentiation is made between locking and locking with arming with regard to the functions of the central locking system.

Locking without arming: The vehicle doors can be opened from the inside by pulling the door handle twice.

Locking with arming: The vehicle doors can be opened neither from the inside nor the inside.

"Locking with arming" is implemented when:
- The ignition lock is in position 0 and the vehicle key is removed.
- The driver's or passenger's door is opened after removing the key
- The driver's and passenger's doors are closed
- The vehicle is locked via the door lock or remote control

Central double-locking of the vehicles also locks the flaps and compartments fitted with central-locking drives (see above).

Central locking drives
The drives are activated by a relay in the general module.

The general module is equipped with a repeat inhibit function in order to protect the drives from thermal overload as the result of frequent use.

Operating points
The central locking system can be operated from following points:
- Door lock of driver's door
- Door lock of passenger's door (only if no remote control is installed)
- Remote control (country-specific radio or infrared remote control)
- Center lock button (central locking button) in vehicle

The vehicle can only be locked and unlocked with the Center lock button, i.e. not armed and disarmed.

NOTE: Remote control functions are executed only if there is no key inserted in the ignition lock.

Automatic unlock
The vehicle doors are unlocked automatically when the airbag control module detects a crash. Crash signaling is performed:
- with airbag control module MRS2 via the CS line from the airbag control module to the general module.
- from airbag control module MRS3 via the K bus.

After crash detection, the central locking system must be unlocked once before locking is possible again.

An armed vehicle is disarmed automatically (not unlocked) when the vehicle key is inserted in the ignition lock. This status is detected by the control module of the "electronic vehicle immobilization system (EWS)".

Selective release
The following function can be coded via car key memory or is coded as standard in some country-specific variants (e.g. USA):

Initially only the driver's door is unlocked if a locked vehicle is unlocked by means of the door lock or remote control. All other doors are switched from the armed status to the disarmed status, however, they are not unlocked (it is possible to unlock the doors using the inner door handle or Center lock button). The doors are unlocked when the vehicle is unlocked for a second time via the door lock or remote control.

Automatic lock
The following function can be coded via car key memory or is coded as standard in some country-specific variants (e.g. USA):

The doors are locked automatically on exceeding a driving speed of 4 km/h.

Emergency operation
In the event of electrical operation failing (e.g. discharged batteries) the door can be unlocked mechanically via the door lock.

Trunk lid
Operation of the trunk lid/tailgate and rear window (E46 Sport Wagon) depends on the status of the central locking system.

When the vehicle is locked, the trunk lid/tailgate/rear window can only be opened using the remote control.