2009 GMC Acadia Owner's Manual - Page 103

Features and Controls 2-35 { CAUTION The Ultrasonic Rear Parking Assist (URPA) system does not replace driver vision. It cannot detect: • 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 when the shift lever is moved into R (Reverse). The rear display briefly illuminates to indicate the system is working. URPA operates only at speeds less than 5 mph (8 km/h). If the vehicle is above this speed, the red light on the rear display flashes. The display is located in the headliner and can be seen by looking over your right shoulder. URPA uses three color-coded lights to provide distance and system information. To be detected, objects must be at least 10 inches (25.4 cm) off the ground and below liftgate level. Objects must also be within 8 feet (2.5 m) from the rear bumper. This distance may be less during warmer or humid weather. A single beep sounds the first time an object is detected. Beeping may occur beginning at 23 inches (0.6 m). Beeping occurs for a short time when the vehicle is closer than 23 inches (0.6 m) and again at 1 foot (0.3 m) from the object.