Parking, Rear, and License Plate Lamps

WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

System Diagram

Courtesy of FORD MOTOR COMPANY

Courtesy of FORD MOTOR COMPANY

Item	Description
1	BCM
2	Headlamp switch
3	License plate lamps
4	LH rear parking lamp
5	Front side marker lamps
6	LH front parking lamp
7	Signature lamps
8	RH rear parking lamp
9	RH front parking lamp
10	Illuminated liftgate applique
11	Reversing lamp assembly
12	(with push button start)
13	(without push button start)
14	Start/Stop switch
15	Ignition switch

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.

When the BCM receives an input requesting the parking lamps on, it provides voltage to the 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

Courtesy of FORD MOTOR COMPANY

Item	Description
1	Transmission range sensor
2	PCM
3	HS-CAN1
4	BCM
5	Reversing lamps
6	Ignition switch
7	Start/Stop switch
8	(without push button start)
9	(with push button start)

Network Message Chart

BCM Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Gear position	PCM	Indicates the transmission is in reverse gear to the BCM. When the transmission is in REVERSE and the ignition in RUN, the BCM provides voltage to the reversing lamps.