2011 GMC Canyon Regular Cab Owner's Manual - Page 252

9-70 Driving and Operating Trailer Wiring Harness The 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: ... Conversions and Add-Ons Add-On Electrical Equipment Notice: Do not add anything electrical to the vehicle unless you check with your dealer first. Some electrical equipment can damage the vehicle and the damage would not be covered by the vehicle's warranty. Some add-on electrical equipment can keep other components from working as they should. Add-on equipment can drain the vehicle's 12‐volt battery, even if the vehicle is not operating. The vehicle has an airbag system. Before attempting to add anything electrical to the vehicle, see Servicing the Airbag-Equipped Vehicle on page 3‑39 and Adding Equipment to the Airbag-Equipped Vehicle on page 3‑40. Yellow: Left Stop/Turn Signal Green: Right Stop/Turn Signal Brown: Taillamps/Park lamps White: Ground Pickup Conversion to Chassis Cab We are aware that some vehicle owners might consider having the pickup box removed and a commercial or recreational body installed. However, we recommend that conversions of this type not be done to pickups. Owners should be aware that, as manufactured, there are differences between a chassis cab and a pickup with the box removed which could affect vehicle safety.