Diagnostic Notes

Switch Ignition Off Before





Connecting and removing test equipment.
Installing and removing central locking relay and alarm control module.
Connecting and disconnecting connectors.
Taking readings with an ohmmeter.
Taking readings with a voltmeter, unless stated otherwise in the step concerned.

Battery





When testing different components, it is important that the battery supply is normal. A battery charger can be connected during testing if required. The car battery can be disconnected without problem. The programed settings are stable for up to 10 years.
Maximum permitted charge 15 Amps at 16 V. current:

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


NOTE: If a siren and rechargeable batteries are fitted, they must be switched off using the appropriate key.


Alarm Control Module





Most fault-tracing involves removing the control module. Readings can then be taken on the alarm relay plinths.

After fault-tracing, replace control module.



To test activation/deactivation of alarm functions, control module must be installed.

Relay Plinths, Alarm Control Module

Illustration shows wiring side relay plinths. The mauve (VO) plinth represents position 210 and the black (SB) plinth position 211 on the alarm control module. These are marked (VO) and (SB) in the illustrations respectively.





Wiring Diagrams

NOTE: Be sure to check the wiring diagram at the back of this manual for the car concerned, as there may be some differences in designations of connectors etc.


Closed doors




With some fault-tracing procedures, the doors, hood (bonnet) or trunk (boot) are opened or closed to check if the alarm is working. To get the right results with these fault-tracing procedures, it is important that the other doors etc. are closed.


Locking the locking system manually with door in open position





During fault-tracing, it may be useful to have the driver's door open. The locking system is locked to the closed position by pushing the central locking unit catch in with a screwdriver.

Once fault-tracing is completed, return the catch to its open position by opening the door using the outside or inside door handle.





NOTE: Take care always to check that the fuses involved, usually fuses 2, 6 and 13, are intact before starting fault-tracing. When taking readings against connections in connector/relay plinth, take care not to cause any physical damage to leads or cause any electrical faults in the system. Use the appropriate pin in the correct relay plinth position.

Fuses






Taking readings with an ohmmeter/voltmeter




Follow instructions carefully when taking readings.
Take note which position the ignition should be in, whether an ohmmeter or voltmeter are required and which positions readings should be taken at.
Put ohmmeter/voltmeter test leads carefully against terminal pins.
Never push test lead into a terminal pin.

NOTE: When bridging, take care not to cause any damage.

Bridging





Connect bridge to positions shown as per instructions in the step concerned. For a simple bridge on positions for control signals (normally ground signals), use a short lead with the ends shaved bare. For a bridge on position H (horn) and position L/R (turn signals (indicators)) with battery supply in the relay plinth, use a coarse lead (e.g. 1.5 sq.mm) with a terminal pin 6.3 flat pin.