2007 Chevrolet Tahoe Owner's Manual - Page 225

• The ultrasonic sensors are not kept clean. So, be sure to keep your vehicle's rear bumper free of mud, dirt, snow, ice, and slush. For cleaning instructions, see Washing Your Vehicle on page 557. If the DIC still displays the PARKING ASSIST OFF message after cleaning the bumper and driving forward at a speed of at least 15 mph (25 km/h), see your dealer. • Other conditions that may affect system performance include vibrations from a jackhammer or the compression of air brakes on a very large truck or other mechanical devices that interfere with URPA performance. • When URPA is disabled without driver action and the driver attempts to turn URPA back on by pressing the rear park aid button, the indicator light will flash for 3 seconds and then stay lit to indicate that URPA is off. As always, drivers should use care when backing up a vehicle. Always look behind you, being sure to check for other vehicles, obstructions and blind spots. For Driver Information Center messages related to URPA, see DIC Warnings and Messages on page 270. If the vehicle bumper is damaged, the URPA system may not work properly. Take the vehicle to your dealer to repair the system. Accessory Power Outlet(s) Accessory power outlets can be used to connect auxiliary electrical equipment, such as a cellular telephone or CB radio. The outlet can accept electrical equipment up to a maximum of 20 amperes. There are four accessory power outlets. There are two under the climate controls, one on the back of the floor console and a additional accessory power outlet in the rear cargo area on the passenger side. 225