GMC Yukon 2007 Owner's Manual page 140

Here is how to avoid setting off the alarm by
accident:
•
If you do not want to activate the
theft-deterrent system, the vehicle should be
locked with the door key after the doors
are closed.
•
Always unlock a door with the RKE transmitter.
Unlocking a door any other way will set off the
alarm if the system has been armed.
If you set off the alarm by accident, turn off the
alarm by pressing unlock on the RKE transmitter or
by placing the key in the ignition and turning it
to START.
140
Testing the Alarm
The alarm can be tested by following these steps:
1. From inside the vehicle, lower the driver's
window and open the driver's door.
2. Activate the system by locking the doors with
the RKE transmitter.
3. Get out of the vehicle, close the door and wait
for the security light to go out.
4. Then 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 vehicle's 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 566.
If the alarm does not sound or the vehicle's
headlamps do not flash, see your dealer for
service.