Parking, Rear, and License Plate Lamps

System Diagram 

Courtesy of FORD MOTOR COMPANY

Parking Lamps 

The headlamp switch sends a status message over the LIN circuit to the BCM to indicate the headlamp switch status (position or a fault with the headlamp switch).

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

When the BCM receives an input requesting the parking lamps on, it provides voltage to the side marker and front parking lamps (halogen headlamps not equipped with headlamp LED signature lamps) or headlamp LED signature lamps at a reduced intensity (High Intensity Discharge (HID) headlamps and halogen headlamps equipped with headlamp LED signature lamps).

The BCM also provides Field Effect Transistor (FET) protection of the parking lamp output circuits. When an excessive current draw is detected, the BCM disables the affected circuit driver.

Refer to: Module Controlled Functions - System Operation and Component Description .

Fog Lamps 

System Diagram 

Courtesy of FORD MOTOR COMPANY