Reversing Lamps

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

When the transmission is in REVERSE, the PCM sends a message over the HS-CAN1 to the BCM indicating the transmission is in REVERSE. The BCM provides voltage to the reversing lamp when it receives the message that the transmission is in REVERSE and the ignition is in RUN.

If the vehicle is equipped with a manual transmission, ground is provided to the reversing lamp switch. When the gear selector is in REVERSE the switch is closed and ground is provided to the PCM.

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