Guard Alarm II System

All inputs and outputs are protected against 12 V and grounding.
Check the following before the control module is exchanged:

Check the connections
- Ignition off.




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

Check that item 31 is connected to ground




- Ignition off.
- Connect an ohmmeter between ground and the alarm relay base item 31. The ohmmeter should show approx. 0 ohms.

If the reading is correct:
- Proceed to item 30 check.

If the value deviates:
Item 31 is not grounded.
- Check connections. Refer to Checking Leads. Checking Leads and Connection
Rectify the fault or renew the lead.

Check that item 30 is connected to battery voltage.




- Ignition off.
- Connect a voltmeter between ground and the alarm relay base item 30 (base C). The voltmeter should show battery voltage.

If the reading is correct:
- Proceed to next measurement below.

If the reading deviates:
Voltage is missing at item 30.
- Check connections. Refer to Fault Alarm Wiring. Checking Leads and Connection

Rectify the fault or renew the lead.

Check that item 50F and item H are not shorted to ground.



- Ignition off.

Measurement A:
- First connect an ohmmeter between ground and the alarm relay base item 50F.
The ohmmeter should show approx. 1 ohm: this is correct and not a sign of shorting.

Measurement B:
- Then connect an ohmmeter between ground and the alarm relay base item H.
The ohmmeter should show approx. 1 ohm: this is correct and not a sign of shorting.

If readings A and B are both correct:
- Proceed to Measurement C.

If there is a deviation:

Measurement A:
There is a short to ground in the lead between item 50F and the starter motor.

Measurement B:
There is a short to ground in the lead between item H and the horn.
- Check connections. Refer to Fault Alarm Wiring. Checking Leads and Connection

Rectify the fault or renew the lead.

Measurement C:




- First connect an ohmmeter between ground and the alarm relay base item L. The ohmmeter should show approx 1 ohm: this is correct and not a sign of shorting.

Measurement D:
- Then connect an ohmmeter between ground and the alarm relay base item R. The ohmmeter should read approx. 1 ohm: this is correct and not a sign of shorting.

If readings C and D are in order:
- Check the connection. Refer to Fault Alarm Wiring. Checking Leads and Connection
Renew the control module.

If the readings deviate:
Measurement C:
There is a short to ground in the lead between item L and the left turn signal.

Measurement D:
There is a short to ground in the lead between item R and the right turn signal.
- Check the connections. Refer to Fault Alarm Wiring. Checking Leads and Connection

Rectify the fault or renew the lead.

Checking Guard Alarm II's accessory wiring

- Ignition off.




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




- Unplug the connector from the Guard Alarm II control module.




Check that the accessory wiring is not shorted to battery supply
- First connect a voltmeter between ground and the 5-pole connector item 2
- Then connect the voltmeter between ground and the 5-pole connector item 3.
The voltmeter should show 0 V.

If the wiring is in order:
- Check the connections.
Renew the control module.
Before the module is renewed it should be checked with the aid of the programming box, see control module. Self Test of Control Module