Principles of Operation

Trailer Lamps

Principles of Operation

The trailer park and stop/turn lamps are supplied power by relays that are energized to correspond with the exterior lighting functions of the vehicle.

The trailer reverse lamps share the output from the vehicle reversing lamps relay.

The trailer tow battery charge relay is energized when the ignition is in the RUN state.

The vehicle is equipped with circuitry to support the installation of an aftermarket Trailer Brake Control (TBC) module (installed by the customer). To support the aftermarket TBC (Trailer Brake Control) module, the vehicle circuitry only supplies voltage, ground, stoplamp switch input and a brake controlling circuit to the trailer tow connector. The trailer electric brakes themselves are controlled by the aftermarket TBC (Trailer Brake Control) module and not the vehicle itself.