Electronic Control Module, No Power Supply (+30 Circuit)

Fault symptom
Car fails to start.
The LED flashes with the ignition switch in the "ST" position.

Condition
No power supply (+30 circuit).

Diagnostic help
- Ignition switch in the "ON" position.
- Press the left-hand button on the remote control five (5) times and the LED will go out.
- The car can be started.
- Ignition switch in the "OFF" position.
- Restart.
If the car starts, the electronic control module has no +30 power supply.







Diagnostic procedure
1 Check the transport fuse
- Check that the MAX 1 fuse is intact and live.
- Connect the test lamp to the fuse and a good grounding point.
If the output side of the fuse is live, the test lamp should light up.
Does the lamp light up?
[YES] Continue with point 2.
[NO] Change the fuse or continue fault diagnosis as described in Service Manual 3:2 "Electrical system, +30 power supply".







2 Check fuse 23.
- Check that fuse 23 is intact and live.
- Connect the test lamp to the fuse and a good grounding point.
If the output side of the fuse is live, the test lamp should light up.
Does the lamp light up?
[YES] Continue with point 3.
[NO] Change the fuse or check the wiring between the MAXI 1 fuse and fuse 23. If necessary, repair or replace the wiring.







3 Check the wiring connected to the VSS electronic control module
- Check the wiring harness for continuity between fuse 23 and pin 25 of the VSS electronic control module.
Is the wiring OK?
[YES] Continue with point 4.
[NO] Repair or replace the wiring harness.

4 Final test
Start the car and check to see if the fault symptom persists.
Does the trouble persist?
[YES] Continue as described in "Before Changing The Electronic Control Module".
[NO] The remedial measures taken were correct or the fault is of intermittent nature.