2011 Chevrolet Silverado 1500 Regular Cab Owner's Manual - Page 357

Driving and Operating When the System Does Not Seem to Work Properly The following messages may be displayed on the DIC: The system can be disabled by pressing the rear park aid disable button located next to the radio. The indicator light comes on and PARK ASSIST OFF displays on the Driver Information Center (DIC) to indicate that URPA is off; see Object Detection System Messages on page 5‑46. Notice: If you use URPA while the tailgate is lowered, it may not detect an object behind your vehicle, and you might back into the object and damage your vehicle. Always verify the tailgate is closed when using URPA or turn off URPA when driving with the tailgate lowered. SERVICE PARK ASSIST: If this message occurs, take the vehicle to your dealer to repair the system. PARK ASSIST OFF: This message occurs if the driver disables the system. PARK ASST BLOCKED SEE OWNERS MANUAL: This message can occur under the following conditions: ... 9-73 The park assist sensors are covered by frost or ice. Frost or ice can form around and behind the sensors and may not always be seen; this can occur after washing the vehicle in cold weather. The message may not clear until the frost or ice has melted. A trailer was attached to the vehicle, or a bicycle or an object was hanging out of the tailgate during the last drive cycle. Once the attached object is removed and the tailgate is raised, 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 are affecting system performance. Examples of this are vibrations from a jackhammer or the compression of air brakes on a very large truck. 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 the Vehicle" under Exterior Care on page 10‑104. . . .