2009 Chevrolet Silverado 2500 HD Extended Cab Owner's Manual - Page 163

The display is located near the passenger side rear window and can be seen by looking over your right shoulder. To be detected, objects must be at least 10 inches (25.4 cm) off the ground and below tailgate 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 will sound the first time an object is detected between 40 inches (1 m) and 8 feet (2.5 m) away. Beeping will occur continuously when the vehicle is at 23 inches (0.6 m) or closer to an object. The following describes what will occur with the URPA display as the vehicle gets closer to a detected object: Description amber light amber/amber lights amber/amber/red lights and continuous beeping for five seconds amber/amber/red lights flashing and continuous beeping for five seconds English 8 ft 40 in 23 in 1 ft Metric 2.5 m 1.0 m 0.6 m 0.3 m URPA uses three color-coded lights to provide distance and system information. 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 will flash. 2-63