2006 GMC Canyon Owner's Manual - Page 276

Maintenance When Trailer Towing Your vehicle will need service more often when you're pulling a trailer. See Scheduled Maintenance on page 6-4 for more on this. Things that are especially important in trailer operation are automatic transmission fluid (don't overfill), engine oil, axle lubricant, belt, cooling system and brake system. Each of these is covered in this manual, and the Index will help you find them quickly. If you're trailering, it's a good idea to review these sections before you start your trip. Check periodically to see that all hitch nuts and bolts are tight. Trailer Recommendations You must subtract your hitch load from the CWR for your vehicle. Weigh your vehicle with your trailer attached, so that you won't go over the GVWR or the GAWR. You'll get the best performance if you spread out the weight of your load the right way, and if you choose the correct hitch and trailer brakes. For more information, see Towing a Trailer on page 4-56 later in this section. Trailer Wiring Harness Your vehicle may be equipped with a four-pin trailer towing harness. This harness has a four-pin trailer connector that is attached to a bracket on the hitch platform. The four-wire harness contains the following trailer circuits: Yellow: Left Stop/Turn Signal Green: Right Stop/Turn Signal Brown: Taillamps/Park lamps White: Ground 4-68