Black plate (43,1)Cadillac STS Owner Manual - 2011When the System Does Not Seem toWork ProperlyIf the URPA system will not activate due to a temporarycondition a red light will be shown on the rear URPAdisplay when the shift lever is moved into R (Reverse).This occurs under the following conditions:. The ultrasonic sensors are not clean. Keep thevehicle's rear bumper free of mud, dirt, snow, iceand slush. For cleaning instructions, see WashingYour Vehicle on page 6‑109.. A trailer was attached to the vehicle, or a bicycle oran object was hanging out of the trunk during thelast drive cycle, the red light may illuminate in therear display. Once the attached object is removed,URPA will return to normal operation.. The vehicle's bumper is damaged. Take the vehicleto your dealer to repair the system.. Other conditions may affect system performance,such as vibrations from a jackhammer or thecompression of air brakes on a very large truck.If the system is still disabled, after driving forward atleast 15 mph (25 km/h), take the vehicle to your dealer.3-43
