Functional Description

Functional Description

The vehicle has as far as the On Board Diagnostic (OBD) is concerned has a central locking system (not convenience system) when the vehicle is not equipped with electric windows with door control units.

The central locking system works using the electric motor principle.

The locking units (door locks) located in the doors are equipped with electric motors.

After receiving a "lock" command from an external source (door lock, radio wave remote control) the doors are locked, the anti-theft system is activated. If necessary, the sliding/tilting sunroof is closed. The feedback message for the relevant control unit is via the contact switch in the lock unit.

The electrical central locking system can operate all the known convenience functions i.e. control of interior lights, anti-theft alarm with interior monitoring, electric windows and mirrors as well as radio wave remote control.

If an airbag is triggered this automatically sends a signal to the central locking control unit which unlocks the doors and switches on the interior lights.







The control unit for the central locking control unit -J393- is located under the instrument panel and is secured to the steering column by a bracket. It is equipped with a DTC memory. The On Board Diagnosis (OBD) connection is located beneath the cover under the steering wheel.

The control unit detects malfunctions in the central locking system and stores them in a permanent memory.

To operate Guided Fault Finding, initiate On Board Diagnosis (OBD) and retrieve the stored information with the scan tool V.A.G 1551.

System tester V.A.G 1552 may also be used.

All functions which could previously be performed with V.A.G 1551/1552 can also be performed with the new tester VAS 5051 in the operating mode vehicle On Board Diagnosis (OBD):

See Operating instructions for Vehicle Diagnosis, Testing and Information System VAS 5051.

The malfunction information displayed is used to refer to a Diagnostic Trouble Code (DTC) table with notes on the possible malfunction causes for directed repair measures.

Malfunctions which can be attributed to a temporary open circuit in the wiring or a loose terminal, will also be stored. These malfunctions will be displayed as sporadic faults "SP".

NOTE: Before changing a component erase DTC memory, perform functional checks and check DTC memory again.