No Alarm When Door Is Opened

Guard Alarm I:
Check programing of control module to see that FUNCTIONS 6 and 8 are not set to SIGNAL PATTERN 1 (no output signal).

Sources of fault
Open-circuit in door contact ground lead.
Open-circuit in signal lead between door contact and central locking relay.
Short-circuit to supply in signal lead between door contact and central locking relay.
Open-circuit in signal lead between central locking relay and alarm control module.
Short-circuit to supply in signal lead between central locking relay and alarm control module.
Fault in door contact.
Fault in alarm control module.

Fault-tracing starts at B1.

B1 Checking Door Contacts
Deactivate alarm.





Ignition on.





Ignition off.





Check that courtesy light switch is in door position.
Open a door.
Courtesy lighting should come on.





Close door.





Ignition on.
Delayed courtesy lighting should go out.





Ignition off.





Test all doors
Repeat step on other doors.
Courtesy lighting should come on when the appropriate door is opened.
If courtesy lighting comes on when the appropriate door is opened.
Check signal lead supply B2.
If courtesy lighting does not come on when any door is opened:
See Central locking symptom.

B2 Checking Signal Lead Supply





Ignition off.
Remove alarm control module (position 210/211).

Open a door.






Connect a voltmeter to alarm relay plinth between position T and position 31 (ground). Voltmeter should read less than 1 V.






If reading is OK:
Check signal lead B3.

If reading is incorrect:
Check lead between central locking system relay plinth position T and alarm relay plinth position T for short-circuit to supply as per WA5 (See Other Fault-Tracing). Deal with fault or replace lead.


B3 Checking Signal Lead
Ignition off.





Change locking unit to locked position by pushing catch in with a screwdriver.





Reset catch in open position after fault-tracing by opening door using inside or outside door handles.






Connect a voltmeter to alarm relay plinth between position T and position 31 (ground). Voltmeter should read battery supply when door is closed.





If reading is OK:
Try another alarm control module after carrying out fault-tracing

Guard Alarm II:
Run self-test of control module in Guard Alarm II (only). Before replacing module.

If reading is incorrect:
Check lead between central locking system relay plinth position T and alarm relay plinth position T for open-circuit as per WA3 (See Other Fault-Tracing). Deal with fault or replace lead.