System Overview With or Without Deadlock

The central locking systems are divided into two distinct systems depending on model year and market (although both systems may be offered in certain markets):
Central Locking System Without Deadlock.
Central Locking System With Deadlock.

The deadlock makes it difficult to break into the car since the interior latches and lock buttons are blocked in the locked position. As a result, the doors cannot be unlocked with the latches or lock buttons if the car is broken into.

Certain central lock features are common to both systems, but the central locking relay, deadlock relay and central lock units in the doors differ between the two systems. When replacing components, it is vital that units appropriate to the relevant system are fitted.

Shared components:
Wiring harness including connectors
Central lock unit, trunk/tailgate
Central lock unit, filler cover.

Components unique to each respective system:
Central lock unit, front doors
Central lock unit, rear doors
Central lock relay
Deadlock relay.

Identification Of Central Locking System
The easiest way of identifying the type of central locking system fitted to the car is as follows:

If the central lock functions:
The central locking system with deadlock features two locking positions, one for activating the central locking system and the other for activating the deadlock. To check if the car is equipped with a deadlock, insert the key in one of the front doors and turn it until the central locking system is activated, locking the car.






If the car features the deadlock system it will now be possible to turn the key a further quarter turn after the central lock is activated. After about 60° the key requires additional pressure to turn, and if the key is turned through a full 90° the central lock units are blocked in the deadlock position.


Color Of The Central Locking Relay:
The color of the central locking relay differs depending on whether or not the car is equipped with a deadlock in addition to the central locking system. A brown central locking relay indicates there is no deadlock, while a purple relay shows that a deadlock is fitted. If the car features a conventional locking system, position 202 in the relay unit (deadlock relay) is empty.

Central Locking Unit:
The central locking units are very similar in appearance but can be distinguished by the location and function of certain microswitches. The simplest means of distinguishing between the two systems is by checking the central locking system wiring harness. If a deadlock is fitted, the harness has a purple wire connected to the black connector (central lock unit for front doors position 8, for rear doors position 6). The central locking units can also be distinguished in that the deadlock system features an additional microswitch beside the lock cylinder.