2010 GMC Terrain Owner's Manual - Page 255

Driving and Operating 8-47 Object Detection Systems Ultrasonic Parking Assist For vehicles with the Ultrasonic Rear Parking Assist (URPA) system, it assists the driver with parking and avoiding objects while in R (Reverse). URPA operates at speeds less than 8 km/h (5 mph), and the sensors on the rear bumper detect objects up to 2.5 m (8 ft) behind the vehicle, and at least 20 cm (8 in) off the ground. { WARNING The Ultrasonic Rear Parking Assist (URPA) system does not replace driver vision. It cannot detect: . The display is located in the headliner. URPA uses three color-coded lights to provide distance and system information. Objects that are below the bumper, underneath the vehicle, or if they are too close or far from the vehicle Children, pedestrians, bicyclists, or pets. . If you do not use proper care before and while backing; vehicle damage, injury, or death could occur. Even with URPA, always check behind the vehicle before backing up. While backing, be sure to look for objects and check the vehicle's mirrors. How the System Works URPA comes on automatically and the display briefly illuminates to indicate the system is working when the shift lever is moved into R (Reverse).