Lights On Chime
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
The BCM sends a class 2 message to the radio or to the chime module to activate an audible warning as a reminder that the headlamps are ON when the door is open and the ignition switch is in the OFF position. The lights ON warning sounds at the fast rate of 200 pulses per minute until the headlamp switch is turned OFF.
Turning the park lamps OFF and turning it back ON with the driver door open will turn the chime OFF.