2009 Buick Enclave Owner's Manual - Page 272

4-32 Driving Your Vehicle If a remote (non-vehicle) battery is being charged, press the Tow/Haul mode switch located on the center console near the climate controls. This will boost the vehicle system voltage and properly charge the battery. If the trailer is too light for Tow/Haul mode, turn on the headlamps (Non-HID only) as a second way to boost the vehicle system and charge the battery. Electric Trailer Brake Control Wiring Provisions These wiring provisions for an electric trailer brake controller are included with the vehicle as part of the trailer wiring package. The instrument panel contains blunt cut wires behind the steering column for the electric trailer brake controller. The harness contains the following wires: The seven-wire harness contains the following trailer circuits: • Yellow: Left Stop/Turn Signal • Dark Green: Right Stop/Turn Signal Brown: Taillamps Black: Ground Light Green: Back-up Lamps Red/Black: Battery Feed Dark Blue: Trailer Brake* Red/Black: Power Supply White: Brake Switch Signal Gray: Illumination Dark Blue: Trailer Brake Signal Black: Ground The electric trailer brake controller should be installed by your dealer/ retailer or a qualified service center. *The fuse for this circuit is installed in the underhood electrical center, but the wires are not connected. They should be connected by your dealer/retailer or a qualified service center. If the back-up lamp circuit is not functional, contact your dealer/ retailer. Engine Cooling When Trailer Towing The cooling system may temporarily overheat during severe operating conditions. See Engine Overheating on page 5-22.