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+30 power supply

Symptom: The theft alarm is not working.

+30 power supply

Fault symptom

The theft alarm is not working.

Important

Drop of +30 power supply to control module brings about total loss of functions.

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

US/CA start fault diagnosis with step 1

For EU, start fault diagnosis as point 2.


Diagnostic procedure

1 Check fuse 23




- Check that fuse 23 is intact and live.

- Connect the test lamp to the fuse and a good grounding point.


The test lamp should light.

Is the test lamp on?

yes

Continue with point 2.


no

Continue fault diagnosis as described in Service Manual 3:2 Electrical system, "+30 power supply".


2 Check the +30 power supply




- Unplug connector H33-3.

- Connect the test lamp to pin 5 of connector H33-3 and a good grounding point.


The test lamp should light.

Does the lamp light up?

yes

Continue with point 4.


no

Continue with point 3.


3 Check the wiring connected to the fuses




- US/CA

Connect the test lamp to fuse 23 and a good grounding point.


The test lamp should light.

Is the test lamp on?

yes

Check and repair or replace the wiring between pin 5 of connector H33-3 and fuse 23.


no

Continue fault diagnosis as described in Service Manual 3:2 Electrical system, "+30 power supply".







- EU

Connect the test lamp to fuse 1 and a good grounding point.


The test lamp should light.

Is the test lamp on?

Yes

Check and repair or replace the wiring between pin 5 of connector H33-3 and fuse 1.


No

Continue fault diagnosis as described in Service Manual 3:2 Electrical system, "+30 power supply".


4 Check the wiring connected to the electronic control module

Check the wiring harness for continuity between pin 5 of connector H33-3 and pin 25 of the electronic control module.

The resistance should be < 1 ohm.

Is the resistance correct?

Yes

Continue with point 5.


No

Repair or replace the wiring harness.


5 Final check

Check the operation and see if the fault symptoms are still present.

Is the problem still present?

Yes

See "Before replacing a control module".


No

The remedial measures taken were correct or the fault is of intermittent nature.