2007 GMC Acadia Owner's Manual - Page 197

If this occurs, URPA assumes the object is still attached, so you will have to wait until the vehicle is driven forward above 15 mph (25 km/h) before URPA will return to normal operation. • The ultrasonic sensors need to be kept clean. So, be sure to keep your vehicle's rear bumper free of mud, dirt, snow, ice, and slush. For cleaning instructions, see Washing Your Vehicle on page 482. If the DIC still displays the PARK ASSIST OFF message after cleaning the bumper and driving forward at a speed of at least 15 mph (25 km/h), see your dealer/retailer. • Other conditions that may affect system performance include vibrations from a jackhammer or the compression of air brakes on a very large truck or other mechanical devices that interfere with URPA performance. As always, drivers should use care when backing up a vehicle. Always look behind you, being sure to check for other vehicles, obstructions and blind spots. If the vehicle bumper is damaged, the URPA system may not work properly. Take the vehicle to your dealer/retailer to repair the system. Accessory Power Outlet(s) The accessory power outlets can be used to connect electrical equipment such as a cellular phone or CB radio. Your vehicle may have four accessory power outlets. They are located on the instrument panel below the climate controls, inside the front center console storage bin, at the rear of the center console, and in the rear cargo area. To use the outlets, remove the cover. When not in use, always cover the outlet with the protective cap. Notice: Leaving electrical equipment on for extended periods will drain the battery. Always turn off electrical equipment when not in use and do not plug in equipment that exceeds the maximum amperage rating of 20 amperes. 197