Antitheft and Alarm System

Fault In The Electronic Control Module

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

Condition
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 generated afresh?
[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.
- Inspect the connector for slide-out of the contact sockets.
- Check the electronic control module's ground and power supply connections:
- pin 25 (+30)
- pin 10 (+15)
- pin 13 (GND)
Everything 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 generated afresh?
[YES] Continue as described in "Before Changing The Electronic Control Module".
[NO The remedial measures taken were correct or the fault is of intermittent nature.