How the System WorksURPA comes on automatically when the shift lever ismoved into REVERSE (R) and the vehicle speed isless than 3 mph (5 km/h). When the system turns on, thethree lights on the display will illuminate for one and ahalf seconds to let you know that the system is working.If your vehicle is moving in REVERSE (R) at a speedgreater than 3 mph (5 km/h), the red light will flashto remind you that the system does not work at a speedgreater than 3 mph (5 km/h).If an object is detected at a REVERSE (R) speed ofless than 3 mph (5 km/h), one of the following will occur:Description English MetricAmber light 5 ft 1.5 mAmber/amber lights 40 in 1.0 mAmber/amber/red lights &continuous chime 20 in 0.5 mAmber/amber/red lights flashing &continuous chime1 ft 0.3 mA chime will sound the first time an object is detectedbetween 20 inches (0.5 m) and 5 feet (1.5 m) away.URPA cannot detect objects that are above liftgate level.In order for the rear sensors to recognize an object,it must be within detection range behind the vehicle.When the System Does Not Seem toWork ProperlyThe light may flash red when the vehicle is inREVERSE (R), if the ultrasonic sensors are not keptclean. So be sure to keep your rear bumper free of mud,dirt, snow, ice and slush. Other conditions that mayaffect system performance include things like thevibrations from a jackhammer or the compression ofair brakes on a very large truck. If after cleaning therear bumper and then driving forward at least15 mph (25 km/h), the display continues to flash red,see your dealer.If a trailer was attached to your vehicle, or a bicycle oran object was on the back of, or hanging out of yourliftgate during your last drive cycle, the light mayalso flash red. The light will continue to flash wheneverin REVERSE (R) until your vehicle is driven forwardat least 15 mph (25 km/h) without any obstructionsbehind the vehicle.For cleaning instructions, see Washing Your Vehicleon page 5-90.3-22
