Starter Motor Interlock (+50)

Fault symptom
The starter motor does not work.
The alarm is not activated in the start position with the alarm armed.
The starter motor runs at different ignition switch positions.


Important: If the LED flashes, the car may be self-immobilized.







Diagnostic procedure
1 Check the starter motor's power supply (+50 circuit)
- Unplug the starter relay.
- Connect a jumper lead between pins 30 and 87 in the relay socket.
- Turn the ignition switch to the "ST" position (+50).

The start motor should start cranking.
Does the starter motor work?
[YES] Continue with point 4.
[NO] Continue with point 2.

2 Check the starter relay's power supply (+50 circuit)
- Connect the test lamp to pin 30 of the relay socket and a good ground.
- Turn the ignition switch to the "ST" position (+50).

The test lamp should light up.
Does it light up?
[YES] Continue with point 3.
[NO] Check the continuity of the wiring between pin 30 of the starter relay's connector and the ignition switch.







3 Check the wiring connected to the starter motor
Check the continuity of the wiring between pin 87 of the starter relay connector and terminal 50 of the starter motor.

The resistance should be < 1 ohm.
Is the resistance OK?
[YES] Check the starting system. See "Starting and charging systems". Starting and Charging
[NO] Check and, if necessary, repair or replace the wiring, including connectors.

4 Check the starter relay
- Check the resistance of the relay's winding.
- Take a resistance reading across pins 85 and 86.

The resistance should be 65 - 100 ohms.
Is the resistance OK?
[YES] Continue with point 5.
[NO] Change the relay.







5 Check the starter relay's connection to ground
- Connect the test lamp to pins 30 and 86 of the relay socket.
- Turn the ignition switch to the "ST" position.

Does the test lamp light up?
[YES] Proceed to point 6.
[NO] Check and repair or replace the wiring, including grounding point G6.

6 Check the starter relay's power supply
- Connect the test lamp to pins 86 and 85 of the relay socket.
- Turn the ignition switch to the "ST" position.

Does the test lamp light up?
[YES] Change the starter relay.
[NO] Continue with point 7.







7 Check the operation of the electronic control module
- Reinstall the starter relay.
- Remove the electronic control module.
- Connect a jumper lead between pins 20 and 8 of the electronic control module's connector.
- Turn the ignition switch to the "ST" position (+50).

Does the starter motor work?
[YES] Continue with point 10.
[NO] Continue with point 8.

8 Check the electronic control module's power supply (+50 circuit)
- Connect the test lamp to a good grounding point and pin 20 of the electronic control module's connector.
- Turn the ignition switch to the "ST" position (+50).

Does the test lamp light up?
[YES] Check and repair or replace the wiring between pin 8 of the electronic control module's connector and pin 85 of the starter relay.
[NO] Continue with point 9.







9 Check the wiring
(Cars with a manual gearbox)
Check for continuity (and repair or replace the wiring, if necessary) between pin 20 of the electronic control module's connector and the ignition switch (+50), including any intermediate connectors.

(cars with automatic transmission)
Check for continuity (and repair or replace the wiring, if necessary) between pin 20 of the electronic control module's connector and the ignition switch (+50), including the starting interlock switch.


Important: The starting interlock switch is closed in selector lever positions P and N, and open in all other selector lever positions.

10 Final test
- Start the car.
- Check to see if the fault symptom persists.

Does the trouble persist?
[YES] Continue as described in "Before Changing the Electronic Control Module". Before Changing the Electronic Control Module
[NO] The remedial measure taken was correct or the fault is of intermittent nature.