Lock units side doors

The lock units (3/74-77) are fitted in the rear of the side doors. The lock units in the front doors are each directly connected to their associated control module in the door. The lock units in the rear doors are directly connected to the rear electronic module (REM).

There are different versions of the lock units, depending on the configuration of the lock motors.

There are two versions of the lock units in the front doors with lock motors for:

• central locking
• central locking and deadlocking.

There are four versions of the lock units in the rear doors with lock motors for:

• central locking
• central locking and deadlocking
• central locking, deadlocking and child-proof locking
• central locking and child-proof locking.

The central locking lock motor locks the door.

The deadlocking lock motor disconnects the mechanical couplings from the door handles and the lock button to the lock unit. This function depends on the market.

The lock motor for child safety locks is only for the rear doors and disconnects the inner door handle and the lock button.

Driver door module (DDM) and the passenger door module (PDM) can only unlock the doors after a command from the rear electronic module (REM).

In addition to the lock motors, the lock units contain up to three contract breakers depending on the configuration:

• contact breaker to indicate that the central locking motor is in the locked position
• contact breaker which indicates that the door is not locked
• contact breaker to indicate the child-proof lock motor is locked.

The lock motors have integral overheating protection which prevents lock motor activation if the lock motor risks becoming too hot.