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 control module has no power supply (+30 circuit)







Diagnostic procedure
1 Check the transport fuse
- Check that fuse 19 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 Power and Ground Distribution/+30 power supply". Testing and Inspection

2 Check the wiring connected to the VSS electronic control module
Check the wiring for continuity between fuse 19 and pin 25 of the VSS control module.

Is the wiring OK?
[YES] Continue with point 3.
[NO] Repair or replace the wiring harness.

3 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". Testing and Inspection
[NO] The remedial measure taken was correct or the fault is of intermittent nature.