+15 Supply

Fault diagnosis, +15 supply


Fault symptom
The alarm is not set off when the ignition is switched on and the alarm is armed.

Action
1 Check +15 supply to the control module
Connect the test lamp between pin 8 in connector H10-1 and a safe grounding point.
Ignition at "ON" (+15).
The test lamp should light.
If the test lamp lights, proceed to point 2.
If not, check the cable assembly between connector H10-1, pin 8 and power supply +15 and take the necessary action as described in Power Supply (+15 Circuit). Testing and Inspection
2 Check +15 supply to the engine control system
Connect the test lamp between pin 9 in connector H10-1 and a safe grounding point.
Ignition at "ON" (+15).
The test lamp should light.
If the lamp lights, proceed to point 5.
If not, proceed to point 3.
3 Check the function of the electronic control module
Remove the theft alarm control module.
Connect jumper between pin 10 and pin 22 in the control module connector.
Connect the test lamp between pin 9 in connector H10-1 and a safe grounding point.
Ignition at "ON" (+15).
The test lamp should light.
If the test lamp lights, proceed to point 6.
If not, proceed to point 4.







4 Check the cable assembly
Conduct a continuity test and take the necessary action on the cable assembly between:
- Connector H10-1, pin 8 and the theft alarm control module, pin 10.
- Connector H10-1, pin 9 and the theft alarm- control module, pin 22.
The resistance should be <1 Ohm.
5 Conduct a continuity test on the cable assembly between:
EU
- the control module connector, pin 22 and Trionics connector, pin 60 (4-cyl cars).
- the control module connector, pin 22 and Motronics connector, pin 27. (6-cyl cars)
US/CAN
- Connector H10-1, pin 9 and Trionics connector, pin 60. (4-cyl cars)
- Connector H10-1, pin 9 and Motronics connector, pin 27. (6-cyl cars)
The resistance should be <1 Ohm.
If the resistance is incorrect, remedy the cable assembly including connectors.
If the resistance is correct, continue fault diagnosis "Action before changing a control module". Before Changing the Electronic Control Module
6 Final test
Start the car and check if the fault symptom remains.
If the problem remains, proceed to "Before Changing the Electronic Control Module". Before Changing the Electronic Control Module