2005 Chevrolet Colorado Owner's Manual - Page 97

If the lock button on the remote keyless entry transmitter is pressed, but a door is open, the horn will chirp six times. Close the open door and the system will be activated. If a locked door is not opened using the remote keyless entry transmitter, or by OnStar®, the alarm will go off. The front turn signal lamps will flash for two minutes, and the horn will sound for two minutes, then will turn off to save the battery power. Remember, the theft-deterrent system won't activate if you lock the doors with a key, the manual door lock, or power door lock switch. The system can only be activated using the remote keyless entry transmitter, or by OnStar®. You should also remember that you can start your vehicle with the correct ignition key if the alarm has been set off. Here's how to avoid setting off the alarm by accident: If you set off the alarm by accident, you can turn off the alarm by pressing unlock on the remote keyless entry transmitter. The alarm won't stop if you try to unlock a door any other way. Testing the Alarm The alarm can be tested by following these steps: 1. From inside the vehicle, activate the system by locking the doors with the remote keyless entry transmitter. 2. Unlock the door with the manual door lock and open the door. This should set off the alarm. 3. To turn the alarm off, press the unlock button on the remote keyless entry transmitter or start the engine. If the alarm does not sound when it should but the lights 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 5-99. If the alarm does not sound or the headlamps do not flash, see your dealer for service. • If you don't 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 remote keyless entry transmitter. Unlocking a door any other way will set off the alarm. 2-15