2010 Buick Lucerne Owner's Manual - Page 146

URPA operates only at speeds less than 8 km/h (5 mph). If the vehicle is above this speed, the red light on the rear display will flash. To be detected, objects must be at least 25 cm (10 in) off the ground and below trunk level. Objects must also be within 2.5 m (8 ft) 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 1 m (40 in) and 2.5 m (8 ft) away. Beeping will occur continuously when the vehicle is at 0.6 m (23 in) 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 Metric 2.5 m 1.0 m 0.6 m When the System Does Not Seem to Work Properly If the URPA system will not activate due to a temporary condition, the message PARK ASSIST OFF will be displayed on the DIC and a red light will be shown on the rear URPA display when the shift lever is moved into R (Reverse). This occurs under the following conditions: . . 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 Washing Your Vehicle on page 6‑104. A trailer was attached to the vehicle, or a bicycle or an object was hanging out of the trunk during the last drive cycle, the red light may illuminate in the rear display. 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 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. English 8 ft 40 in 23 in . . . 0.3 m 1 ft . The system can be disabled through the Driver Information Center (DIC). See "Park Assist" under DIC Operation and Displays on page 4‑47 for more information. 3-38 If the system is still disabled after driving forward at least 25 km/h (15 mph), take the vehicle to your dealer.