Testing the Alarm

To test the alarm:

1. From inside the vehicle, lower the driver side window, and open the driver door.

2. Press 3. Get out of the vehicle, close the door, and wait for the security light to go out..

3. Get out of the vehicle, close the door, and wait for the security light to go out.

4. Reach in through the window, unlock the door with the manual door lock, and open the door.

This should set off the alarm.

If the alarm does not sound when it should, but the headlamps flash, check to see if the horn works.

The horn fuse may be blown.

To replace the fuse, see Fuses and Circuit Breakers on page 10‑31.

If the alarm does not sound or the headlamps do not flash, see your dealer for service.

    See also:

    How the System Works
    URPA comes on automatically when the shift lever is moved into R (Reverse). A single tone sounds to indicate the system is working. URPA operates only at speeds less than 8 km/h (5 mph). An obstacle ...

    Engine Air Cleaner/Filter
    If the vehicle has a diesel engine, see “Pickup Models” under “Engine Air Cleaner/Filter” in the Duramax® Diesel Supplement for the correct inspection and replacement procedures. See Engine ...

    How to Detect a Tamper Condition
    If is pressed and the horn sounds, an attempted break-in has occurred while the system was armed. If the alarm has been activated, the THEFT ATTEMPTED message will appear on the DIC. See Key and ...