GM Service Manual Online
For 1990-2009 cars only

Your vehicle has a battery run-down protection feature designed to protect your vehicle's battery.

It will activate when there has been no electrical change for one hour, nothing has been turned on or off, after the ignition has been turned to ON or LOCK.

Once activated, all the interior lamps will turn off including dome, reading, glovebox, trunk.

The system is turned on if a door is opened, the vehicle is unlocked, or the trunk is opened. Once the system is turned on, the one hour battery protection time resets to zero and the interior lamps will continue to operate for another hour, or until the vehicle is locked.

The interior lamp system will shut down 10 seconds after your vehicle is locked using either the key or the remote key locking system. However, if an interior lamp, such as the dome lamp, has been turned on manually and is on at the time the vehicle is locked, the system will not shut down after the normal 10 seconds. The one hour battery protection will be activated instead.

The vehicle's hazard lights will continue to operate at all times.

Accessory Control

If you want the accessories to operate once the key has been removed from the ignition, you must turn the system on by either manually starting an accessory, such as turning the radio on again. This will activate a one hour timer that will operate accessories such as the radio, accessory power outlet, and windshield wipers before turning off. These actions will reset the timer to zero. Likewise, if an accessory such as the radio is turned on at any time during the one hour period, the timer is reset to zero and all accessories will continue to operate for another hour. To enable accessory control after the system has been reset, you must turn the ignition on and then off again.