No Alarm on Trunk Lid

(Step D1) Checking the trunk lid contact




- Ignition off.
- Open the trunk lid.
- Set the trunk light button to position "on".
The trunk light should come on.




4-door:
- Close the locking mechanism by forcing in the latch with a screwdriver.
The trunk light should go out.
(The catch is returned to open by pressing in the trunk opening button).




5-door:
- Close the tailgate
The light should go out.

If both readings are correct:
- Continue with step D2.

If the reading deviates:
- Check the tailgate contact (5-door) grounding for defects, e.g. corrosion, looseness or sticking.
- Investigate the trunk lighting.

(Step D2) Checking the trunk door contact.




- ignition off.




- Remove the panels on the left hand side of the trunk.
- Disconnect the gray 24-pole connector A16.




4-door:
- Close the locking mechanism by pushing in the latch with a screwdriver.

5-door:
- Close the tailgate.





- Connect an ohmmeter between ground and connector item 9.
The ohmmeter should read infinity.

If the reading deviates:
There is a break to ground in the signal lead between the trunk light and the 24-pole connector A16 item 9.
The ohmmeter should read infinity.
- Rectify the fault or renew the lead.


If the reading is correct:
- Proceed to 4 door, 5 door below.




4 door:
- Reset the latch to open by pressing the trunk lid button.

5-door
- Open the tailgate.




- Connect an ohmmeter between item 9 and ground.
The ohmmeter should read approx. 0 ohms.

If the reading is correct:
- Continue with step D3.

If the reading deviates:
There is a short to ground in the signal lead between the trunk light and the 24.pole connector A16 item 9.
- Rectify the fault or renew the lead.

(Step D3) Checking the signal lead



- Ignition off.





- Plug in the 24-pole connector.





- Close the trunk.





- Remove the alarm control module (item C/F).





- Connect an ohmmeter between item RH and item 31 on the alarm relay base.
The ohmmeter should read infinity with the trunk lid closed.

If the reading is correct:
- Open the trunk lid and proceed with the next measurement.

If any reading deviates:
There is a short in the signal lead between the 24-pole connector A16 item 9 and the alarm relay base item RH.
- Rectify the fault or renew the lead.
Replace the alarm control module.





- Open the trunk lid.





- Connect an ohmmeter between item RH and item 31.
The ohmmeter should read 0 ohms with the lid open.

If the reading is correct:
There is most likely a fault on the alarm control module.
- Proceed with fault tracing. Fault Tracing Alarm Wiring

It the reading deviates:
There is a break in the signal lead between the 24-pole connector A16 item 9 and the alarm relay base item RH.
- Rectify the fault or replace the lead.
Replace the alarm control module.