Parking, Rear, and License Plate Lamps

System Diagram 

Courtesy of FORD MOTOR COMPANY

Parking Lamps 

The BCM monitors the headlamp switch position by sending voltage signals on multiple circuits to the headlamp switch. There is one circuit for each headlamp switch position. At any given time, one of the signal circuits is switched to ground to indicate the headlamp switch position.

If the BCM detects a fault from the headlamp switch or loses communication with the headlamp switch, the BCM turns the parking and headlamps on. This is normal behavior of the BCM when a fault has been detected with the inputs from the headlamp switch.

For North America, for front parking lamps, when the BCM receives a request for parking lamps, the BCM sends a message over the LIN circuit to the adaptive front lighting module to dim the signature/park lamps and the front fascia mounted DRL/supplemental parking lamps.

Except North America, for front parking lamps, when the BCM receives a request for parking lamps, the BCM sends a message over the LIN circuit to the adaptive front lighting module to illuminate the headlamp parking lamps.

For rear parking lamps, when the BCM receives a request for a parking lamps, the BCM supplies voltage to the rear parking lamps.

The BCM also provides Field Effect Transistor (FET) protection of the parking lamps output circuits. When an excessive current draw is detected, the BCM disables the affected parking lamps circuit driver. Refer to: Module Controlled Functions - System Operation and Component Description .

Reversing Lamps 

System Diagram 

Courtesy of FORD MOTOR COMPANY

Network Message Chart 

BCM Network Input Messages