2008 Cadillac STS Owner's Manual - Page 119

When the System Does Not Seem to Work Properly • The ultrasonic sensors are not clean, a red URPA display light may illuminate when the vehicle is in REVERSE (R). Keep your rear bumper free of mud, dirt, snow, ice and slush. For cleaning instructions, see Washing Your Vehicle on page 5-110. Side Blind Zone Alert Your vehicle may have a Side Blind Zone Alert (SBZA) system. The SBZA system is an aid that may help you avoid lane change crashes with vehicles in your side blind spots (zones). Read the entire section before using the system. See "Side Blind Zone Alert" in the Index of the navigation manual. • A trailer was attached to your vehicle, or a bicycle or an object was hanging out of your trunk during your last drive cycle, the red light may illuminate. Once the attached object is removed, URPA will return to normal operation. Lane Departure Warning Your vehicle may have a Lane Departure Warning (LDW) system. The LDW system does not steer the vehicle and is only an aid to help you stay in your driving lane. Read the entire section before using the system. See "Lane Departure Warning" in the Index of the navigation manual. • The vehicle's bumper is damaged. Take the vehicle to your dealer/retailer 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. If the system is still disabled, after driving forward at least 15 mph (25 km/h), take your vehicle to your dealer/retailer. 2-47