Normal Operation
WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The headlamps on warning chime sounds when the driver door is opened with the ignition switch in the OFF position and the key out, and the vehicle security module detects the exterior lamps on with the headlamp switch not in the autolamp position. The headlamp on reminder chime is only operative when autolamp is not selected.