Lights on Warning

The body control module (BCM) will sound the lights on warning when the BCM senses all of the following conditions:
^ The ignition switch is in the OFF, LOCK or ACCY position. There is no voltage at circuit 39 to the BCM ignition positive voltage input.
^ The park lamps or headlamps are on. Voltage is applied through circuit 9 to the BCM park lamps input.
^ The driver door is open. On vehicles without door jamb switches: ground is applied from G200 through circuit 750, the left side door lock and circuit 745 to the BCM driver door open input.

On vehicles with door jamb switches: ground is applied through the door jamb switch and CKT 745 to the BCM driver door open input.