+30 Power Supply Circuit

Fault symptom
The anti-theft alarm does not work.


Important: Failure of the power supply (+30 circuit) for the electronic control module will result in total loss of alarm functions.

Check the +30 power supply circuit by arming and disarming the anti-theft alarm.







Diagnostic procedure
1 Check fuse 19.
- Check that fuse 19 is intact and live.
- Connect the test lamp to the fuse and a good grounding point.

The test lamp should light up.
Does it light up?
[YES] Continue with point 2.
[NO] Continue fault diagnosis as described in "Power and Ground Distribution/+30 power supply". Testing and Inspection







2 Check the wiring connected to the control module.
- Unplug the control module.
- Inspect the connector for socket slide-out.
- Check that the control module is supplied with power.
- Connect the test lamp to pin 25 of the connector and a good grounding point.

The test lamp should light up.
Does it light up?
[YES] Continue with point 3.
[NO] Check and rectify the wiring between pin 25 of the connector and fuse 19.

3 Final test
Check to see if the fault symptom persists.

Does the trouble persist?
[YES] Continue as described in "Before Changing the Electronic Control Module". Before Changing the Electronic Control Module
[NO] The remedial measure taken was correct or the fault is of intermittent nature.