Starter Immobilizer +50

Fault diagnosis, starter immobilizer +50

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


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


Action
1 Check the +50 supply to the starter motor
Disconnect the starter relay.
Connect jumper between pins 30 and 87 in the relay holder.
Turn the ignition key to the "ST" position (+50).
If the starter motor works, proceed to point 4.
If not, proceed to point 2.
2 Check the +50 supply to the starter relay
Connect the test lamp between pin 30 in the relay holder and a safe grounding point. Turn the ignition key to the "ST" position (+50).
If the test lamp lights, proceed to point 3.
If not, conduct a continuity test on the cable assembly between the starter relay connection, pin 30 and the ignition switch.
3 Check the cable assembly to the starter motor
Conduct a continuity test on the cable assembly between starter relay connection, pin 87 and starter motor, connection 50.
The resistance should be <1 Ohm.
If the resistance is incorrect, check the cable assembly including connectors and take the necessary action.
If the cable assembly is fault4ree, check the starting system.
See Service Manual 3:2 Electrical system, "Starting and charging systems". Starting System







4 Check the starter relay
Measure the resistance over the relay winding. Measure the resistance between relay pins 85 and 86.
The resistance should be 65 - 100 Ohms.
If the resistance is incorrect, change the relay.
If the resistance is correct, proceed to point 5.
5 Check the Starter relay ground connection
Connect the test lamp between pins 30 and 86 in the relay holder.
Turn the ignition key to the "ST" position.
If the test lamp lights, proceed to point 6.
If not, check the cable assembly including grounding point G6 and take the necessary action.
6 Check the voltage supply to the starter relay
Connect the test lamp between pins 86 and 85 in the relay holder.
Turn the ignition key to the "ST" position.
If the test lamp lights, change the starter relay.
If not proceed to point 7.







7 Check the function of the electronic control module
Reinstall the starter relay.
Remove the control module.
Connect jumper between pin 20 and pin 8 in the control module connector.
Turn the ignition key to the "ST" position (+50).
If the starter motor works, proceed to point 10.
If not, proceed to point 8.

8 Check the +50 supply to the control module
Connect the test lamp between a safe grounding point and the control module connector, pin 20.
Turn the ignition key to the "ST" position (+50).
If the test lamp lights, check the cable assembly between control module connector, pin 8 and starter relay, pin 85 and take the necessary action.
If not, proceed to point 9.
9 Check the cable assembly (cars with manual gearbox)
Conduct a continuity test on the cable assembly between the control module connector, pin 20 and the ignition switch +50, including all connectors, and take the necessary action.

(Cars with automatic transmission)
Conduct a continuity test on the cable assembly between the control module connector, pin 20 and the ignition switch +50, including the starting interlock switch, and take the necessary action.


Important : The starting interlock contacts are closed in transmission range positions P and N, and open in all other transmission range positions.


10 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