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B1605

Symptom: Anti-theft alarm completely unserviceable. Indefinable (different functions may be affected, due to an internal memory and/or programming fault)

B1605

Control module fault

Fault symptom

Anti-theft alarm completely unserviceable. Indefinable (different functions may be affected, due to an internal memory and/or programming fault)

Conditions

Electronic control module fault (internal) generates diagnostic trouble code

Diagnostic procedure

1 Check the generation of the diagnostic trouble code




- Clear the diagnostic trouble code

- Drive the car on test

- Check whether the diagnostic trouble code is generated afresh.


Is the DTC being registered?

yes

Continue with point 2.


no

The fault is intermittent.


2 Check the anti-theft alarm's electronic control module connection




- Remove the electronic control module.

- Check the connector for loose connector sleeves.

- Check the control module's ground and power supply connections: -pin 25 (+30) -pin 10 (+15) -pin 13 (GND)


All OK?

yes

Refit the electronic control module and continue with point 3.


no

Take remedial action.


3 Check the generation of the diagnostic trouble code




- Clear the diagnostic trouble code

- Drive the car on test

- Check whether the diagnostic trouble code is generated afresh.


Is the DTC being registered?

yes

See "Before replacing a control module".


no

The remedial measures taken were correct or the fault is of intermittent nature.