Important Testing Information

Lock locking module with door in open position.




Doors and trunk/tailgate may be open while fault-tracing. Lock locking module in locked position by pushing central locking latch in with a screwdriver.




Once fault-tracing is complete, return latch to open position using the outside or inside door controls.

Immobilizing door switches manually




The door switches do not affect the working of the central locking system. If you wish, you can immobilize the door switches by pushing them in and turning them clockwise. Door switches will reset when the door is shut again.




Switch ignition off before:
- connecting and disconnecting test equipment.
- connecting and disconnecting central locking relay.
- connecting and disconnecting connectors.
- using an ohmmeter
- using a voltmeter unless step instructions indicate otherwise.

Battery




When testing the various components, it is important that the battery voltage is normal. A battery charger can be connected while testing if necessary.

Maximum permitted charge current:
15 amps at 16 volts.

Do not disconnect leads while engine is running. Disconnect battery leads when rapid charging.

Central locking relay and driver's door relay




Most of the fault-tracing procedures below involve removing the central locking relay and driver's door relay. Readings can then be taken on the relay bases.

Replace central locking relay and driver's door relay once fault-tracing is complete.




To test whether the central locking system functions can be activated or deactivated, the central locking relay and driver's door relay must be installed.

Using an ohmmeter/voltmeter






CAUTION: Be careful when taking readings on connections for terminal pins/sockets in connector/relay base to avoid damaging terminal pins or causing electrical faults in the system.


Follow instructions in the step concerned closely when taking readings. Note which position the ignition should be in, if an ohmmeter or voltmeter should be used and which positions readings should be taken at. Put ohmmeter/voltmeter probes carefully against terminal pins. Never push a test pin into a terminal pin.




Bridging


NOTE: Take care not to cause any damage when bridging.





Connect the bridge to the positions shown as per the instructions in the step concerned.

For a simple bridge on positions for control signals (usually ground signals), use a short lead with the ends exposed.





To bridge pos M- and pos M+ to the battery supply in the relay base, use a thick wire (e.g. 1.5 Sq.mm) and terminal pins 6.3 flat pin.