2010 GMC Acadia Owner's Manual - Page 292

9-36 Driving and Operating . The system can be disabled through the Driver Information Center (DIC). See "Park Assist" under Vehicle Personalization (With DIC Buttons) on page 5‑45 for more information. When the System Does Not Seem to Work Properly If the URPA system does not activate due to a temporary condition, the message PARK ASSIST OFF displays on the DIC when the shift lever is moved into R (Reverse). This may occur under the following conditions: . . A trailer was attached to the vehicle, or a bicycle or an object was hanging out of the liftgate during the last drive cycle. Once the attached object is removed, URPA will return to normal operation. A tow bar is attached to the vehicle. The vehicle's bumper is damaged. Take the vehicle to your dealer/retailer to repair the system. Other conditions may affect system performance, such as vibrations from a jackhammer or the compression of air brakes on a very large truck. Rear Vision Camera (RVC) The vehicle may have a Rear Vision Camera system. Read this entire section before using it. . { WARNING The Rear Vision Camera (RVC) system does not replace driver vision. RVC does not: . . . The driver disables the system. The ultrasonic sensors are not clean. Keep the vehicle's rear bumper free of mud, dirt, snow, ice and slush. For cleaning instructions, see Exterior Care on page 10‑86. Detect objects that are outside the camera's field of view, below the bumper, or underneath the vehicle. Detect children, pedestrians, bicyclists, or pets. . If the system is still disabled, after driving forward at least 25 km/h (15 mph), take the vehicle to your dealer/retailer. Do not back the vehicle by only looking at the RVC screen, or use the screen during longer, higher speed backing maneuvers or where there could be cross-traffic. (Continued)