2005 GMC Envoy Owner's Manual - Page 91

Theft-Deterrent Systems Vehicle theft is big business, especially in some cities. Although your vehicle has a number of theft-deterrent features, we know that nothing we put on it can make it impossible to steal. Here's how to operate the system: 1. Open the door. 2. Lock the door with the power door lock switch or the remote keyless entry transmitter. The security light should flash. 3. Close all doors. The security light should turn off after approximately 30 seconds. The alarm is not armed until the security light turns off. If a locked door is opened without the key or the remote keyless entry transmitter, the alarm will go off. The headlamps and parking lamps will flash for two minutes, and the horn will sound for 30 seconds, 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 or use the manual door lock. It activates only if you use a power door lock switch with the door open, or with the remote keyless entry transmitter. You should also remember that you can start your vehicle with the correct ignition key if the alarm has been set off. Content Theft-Deterrent Your vehicle may be equipped with a content theft-deterrent alarm system. The security light is located on the instrument panel cluster. 2-17