No Alarm When Door Is Opened
(Step B1) Checking the door contacts
- Deactivate the alarm.
- Ignition on.
- Ignition off.
- Check that the interior light switch is in position door.
- Open a door.
The interior light should come on.
- Close the door concerned.
- Set ignition to position II, so that prolonged lighting goes off.
- Set ignition to off.
Try all doors
- Repeat the procedure on the remaining doors. The interior light should come on when each door is opened.
If all results are correct:
Continue with step B2.
If there is a deviation:
- Refer to Locks. Locks
(Step B2) Checking signals from the central locking relay
- Ignition off.
- Remove the alarm control module (item C/F).
- Close all doors, the hood and the trunk
- Connect an ohmmeter between item T and item 31 on the alarm relay base.
The ohmmeter should read infinity when all doors are closed.
If the reading is correct:
- Proceed to ohm test below.
If the reading deviates:
- Continue with step B3.
- Open a door.
Ohm Test
- Connect an ohmmeter between item T and item 31 on the alarm relay base.
The ohmmeter should show approx. 0 ohms when the relevant door is open.
If the reading is correct:
There is most likely a fault on the control module.
- Carry out fault tracing. Fault Tracing Alarm Wiring
If the reading deviates:
- Continue with step B3.
(Step B3) Checking the signal lead from the central locking relay
- Ignition off.
- Disconnect central locking relay items (D/G).
- Connect an ohmmeter between the alarm relay base item T and the central locking relay base item T.
The ohmmeter should show approx. 0 ohms.
If the reading is correct
There is most likely a fault on the alarm control module.
- Proceed with fault tracing. Fault Tracing Alarm Wiring
If the reading deviates:
There is a break in the lead between the alarm relay base item T and the central locking relay base item T.
- Rectify the fault or change the lead.
Replace the central locking relay.
Replace the alarm control module.