Trailer Lamps: Overview

Trailer Lamps

Overview

The trailer tow system consists of the following components:

- Trailer tow connector

- Trailer tow relays

- TBC (Trailer Brake Control) module (if equipped)

- BCM (Body Control Module)

Vehicles not equipped with trailer tow require a Ford authorized accessory kit to add this option. Adding bulbs/lighting to existing circuits can cause the BCM (Body Control Module) to shut down the circuit and set a DTC (Diagnostic Trouble Code) due to the unexpected current flow.

When the vehicle's rear stop/turn, parking lamps or reversing are illuminated, voltage is also supplied to a corresponding trailer tow relay located in the BJB (Battery Junction Box).

Vehicles with a class III hitch are equipped with circuitry to support an aftermarket TBC (Trailer Brake Control) module and provide voltage to the trailer tow connector when the ignition is in RUN for trailer battery charging.