Principles of Operation

PRINCIPLES OF OPERATION

The trailer tow stop/turn lamps receive voltage from the vehicle rear stop/turn lamp circuits. When a rear stop/turn lamp is illuminated, voltage is also routed to the trailer tow connector.

The trailer tow parking lamps are supplied voltage by the trailer tow parking lamp relay. When the parking lamps are illuminated, voltage is also routed to the trailer tow parking lamp relay coil. When the trailer tow parking lamp relay is energized, voltage is supplied to the trailer tow connector.

The trailer tow reversing lamp relay is supplied voltage from the reversing lamp circuit. When the reversing lamps are illuminated, voltage is supplied to the trailer tow connector.

The trailer battery charging system supplies battery voltage to the trailer tow connector when the ignition switch is in the RUN position.

If equipped, the vehicle also supplies circuitry to support the installation of an aftermarket trailer brake control module (TBCM) (installed by the customer). The vehicle circuitry only supplies voltage, ground, stoplamp switch input and a controlling circuit to the trailer tow connector. The trailer electric brakes themselves are controlled by the aftermarket TBCM and not the vehicle itself.