Step C3

Checking the signal lead




- Ignition off.




Bridge item and item B on the hood contact connectors.

- Connect an ohmmeter between item FH and item 31.
The ohmmeter should read infinity.

If the reading is correct:
- Proceed to remove the bridge.

If the reading deviates:
There is a short to earth in the signal lead between the hood contact and the alarm relay base item FH.
- Rectify the fault or renew the lead.
Replace the alarm control module.
Replace the hood contact lead or connector.




- Remove the bridge.




- Connect an ohmmeter between item FH and item 31.
The ohmmeter should read infinity.

If the reading is correct:
- Proceed hood leads check.

If the reading deviates:
There is a short to earth in the signal lead between the hood contact and the alarm relay base item FH.
- Rectify the fault or renew the lead.
Replace the alarm control module.
Replace the hood contact lead or connector.

Hood contact leads check




- Check that neither male nor female contacts in the hood are deformed or corroded.
- Replace the contacts to the hood.




- Close the hood.




- Connect an ohmmeter between ground and the alarm relay base item FH.
The ohmmeter should read infinity when the hood is closed.

If the reading is correct:
- Proceed to Open the Hood.

If the reading deviates:
There is a fault on the hood contact.
- Renew the hood contact.
Replace the alarm control module.




- Open the hood.




- Connect an ohmmeter between ground and the alarm relay base item FH.
The ohmmeter should show approx. 0 ohms when the hood is open.

If the reading is correct:
There is most likely a fault in the alarm control module.
- Carry out fault tracing. Fault Tracing Alarm Wiring

If the reading deviates:
There is a fault in the hood contact.
- Renew the hood contact.
Replace the alarm control module.