System Operation

Parking, Rear, and License Plate Lamps

System Operation

System Diagram





Network Message Chart

BCM (Body Control Module) Network Input Messages






Parking Lamps

The headlamp switch is integrated into the FLM (Front Lighting Control Module). The FLM (Front Lighting Control Module) monitors the headlamp switch position and sends the headlamp switch status message over the communication network to the BCM (Body Control Module) to indicate the headlamp switch status (position or a fault with the headlamp switch).

If the BCM (Body Control Module) detects a fault from the headlamp switch or loses communication with the FLM (Front Lighting Control Module), the BCM (Body Control Module) turns the parking lamps and headlamps on and keeps them on until the battery saver feature times out. REFER to Battery Saver .

If either situation occurs, the BCM (Body Control Module) cannot be ruled immediately as being at fault. This is normal behavior of the BCM (Body Control Module) design as a fault has been detected with the inputs from the headlamp switch.

When the BCM (Body Control Module) receives input requesting the parking lamps on, it energizes an internal relay to provide voltage to the parking lamps. One circuit provides voltage to all of the front parking lamps and a second circuit provides voltage to all of the rear parking lamps.