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Home >> Volkswagen >> 2006 >> GTI 1.8 E, Automatic >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)] >> 01 On Board Diagnostic (OBD) >> Central locking system (vehicles without power windows), On Board Diagnostic (OBD) >> Functional description

Functional description

The locking units located in the doors (door lock) have an electric motor.

The motor locks the door and also takes care of the "Safe" condition, i.e. after locking at an external lock (door lock, tailgate, radio remote control) the vehicle is protected against theft and can no longer be unlocked from the interior. The feedback on the respective condition in control module occurs via the contact switch in the locking unit.

All the known convenience functions can be performed with the electric convenience system, interior lights control, ATA with interior monitoring and the radio remote control.

If the Airbag Control Module is triggered, a signal is sent to the convenience control module to unlock the doors.

Fig 1: Locating Central Locking Control Module -J379
GW00003910Courtesy of VOLKSWAGEN UNITED STATES, INC.

The Central Locking Control Module -J379- is located under the instrument panel and is secured by a bracket to the steering column. It is equipped with a DTC memory. The On Board Diagnostic (OBD) connection is located under the driver's knee bar to left of the steering wheel.

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

To commence troubleshooting, initiate self-diagnosis and retrieve the stored information with the V.A.G 1551 scan tool.

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

The malfunction information displayed is used to refer to a 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, will also be stored. These malfunctions will be displayed as sporadic DTCs "SP".

Determining the items which have possibly triggered the anti-theft alarm system 

The breakdown of the display content. Refer to Break down of display content for display group number 010  for the display group number 10 gives information as to which component triggered the alarm system last, and can therefore help the troubleshooting/rectification.

This "DTC memory" cannot be erased.

Only statistical malfunctions are considered:

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