GM Service Manual Online
For 1990-2009 cars only

After all the doors and liftgate are closed, and the key is out of the ignition, in LOCK/OFF or ACC/ACCESSORY, the light remains on for about 15 seconds and then goes out, except under the following conditions:

    • The ignition is turned to ACC/ACCESSORY or ON/RUN after all the doors and liftgate are closed.
    • All the doors and the liftgate are locked and the light is still on.

When any door is unlocked with the key or Remote Keyless Entry (RKE) system transmitter, the light comes on for 15 seconds, even if the door is not opened.