Control module +30 power supply absent, VSS
Symptom: Car fails to start.The LED flashes with the ignition switch in the "ST" position.
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Control module +30 power supply absent, VSS
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Fault symptom
Car fails to start.
The LED flashes with the ignition switch in the "ST" position.
Conditions
+30 power supply absent.
Diagnostic help
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Ignition switch in the "ON" position
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Press the left-hand button on the remote control five (5) times and the LED will go out
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Ignition switch in the "OFF" position
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If the car starts, the control module has no +30 power supply.
Diagnostic procedure
1 Check the transport fuse
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Check that the MAXI 1 fuse is intact and live.
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Connect the test lamp to the fuse and a good grounding point.
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If the output side of the fuse is live, the test lamp should light up.
Does the lamp light up?
Continue with point 2.
Change the fuse or continue fault diagnosis as described in Service Manual 3:2 Electrical system, +30 power supply.
2 Check fuse 23
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Check that fuse 23 is intact and live.
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Connect the test lamp to the fuse and a good grounding point.
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If the output side of the fuse is live, the test lamp should light up.
Does the lamp light up?
Continue with point 3.
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
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Check the wiring harness for continuity between fuse 23 and pin 25 of the VSS electronic control module.
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Is the wiring harness correct?
Continue with point 4.
Repair or replace the wiring harness.
4 Final check
Start the car and check to see if the fault symptom remains.
Is the problem still present?
See "Before replacing a control module".
The remedial measures taken were correct or the fault is of intermittent nature.
