GM Service Manual Online
For 1990-2009 cars only

A headlamp reminder chime will sound if the following conditions are met:

    • The driver door is open.
    •  Parking lamps or headlamps are manually turned on.
    • The key is either not in the ignition switch, or it is in the LOCK position of the ignition switch.

The headlamp reminder cannot be turned off if the conditions listed above are met.

In the automatic mode, the headlamps turn off once the ignition is in ACC.