Headlamps On Warning Chime
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
The headlamp chime is activated when the instrument cluster receives the headlamps ON signal from the SJB, the key is out of the ignition, and the driver door is ajar. The warning consists of repeated one-half second bursts and will continue to sound until the headlamps/parking lamps are turned off, the driver door is closed, or 10 minutes have elapsed, at which time the battery saver will turn the headlamps off.