Functional Description

Functional Description

The vehicle has as far as the On Board Diagnosis (OBD) is concerned has a Comfort System (vehicles with power windows) (not central locking system) when the vehicle is equipped with electric windows, with door control units, and central locking.

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 and the windows and sliding/tilting sunroof are closed. The feedback message for the relevant control unit is via the contact switch in the lock unit.

The electrical Comfort System (vehicles with power windows) 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 provided the vehicle is equipped with these functions.

If an airbag is triggered this automatically sends a signal to the Comfort System (vehicles with power windows) which unlocks the doors and switches on the interior lights.







The Central control module for comfort system -J393- is located under the instrument panel and is secured to the steering column by a bracket. It is equipped with a fault memory. The On Board Diagnosis (OBD) connection is located beneath the cover under the steering wheel.

The control unit recognizes faults and malfunctions in the central locking Comfort System (vehicles with power windows) (Comfort System (vehicles with power windows) includes central locking, anti-theft alarm, electric windows, radio wave remote control, mirror) and stores them in a non-volatile memory.

To commence fault finding, initiate On Board Diagnosis (OBD) and retrieve the stored information with the Vehicle Diagnosis, Testing and Information System VAS 5051 or the scan tool V.A.G 1551/1552 1).

1) Some functions which could previously be performed with V.A.G 1551/1552 must now be performed with the Vehicle Diagnosis, Testing and Information System VAS 5051 in the operating mode vehicle On Board Diagnosis (OBD).

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

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