GM Service Manual Online
For 1990-2009 cars only

The Ultrasonic Rear Parking Assist (URPA) system is designed to help you park while the vehicle is in REVERSE (R). It operates only at very low speeds, less than 3 mph (5 km/h). URPA can help make parking easier and help you avoid colliding with objects such as parked vehicles. The URPA system can detect objects up to 5 feet (1.5 m) behind the vehicle, and tell you how close these objects are from your rear bumper.

Caution: The Ultrasonic Rear Park Assist (URPA) system does not replace driver vision. URPA does not:

   • Operate above speeds of 3 mph (5 km/h).
   • Detect objects more than 5 feet (1.5 meters) behind the vehicle. This distance may be less during warmer or humid weather.
   • Detect objects that are below the bumper, underneath the vehicle, or that are very close to the vehicle.
   • Detect children, pedestrians, bicyclists, or pets.
So if you do not use proper care before backing up, you could hit a vehicle, child, pedestrian, bicyclist, or pet, resulting in vehicle damage, injury, or death. Even though the vehicle has the URPA system, always check carefully before backing up by checking behind your vehicle.


Object Number: 805622  Size: A2

The URPA display is located inside the vehicle, above the rear window. It has three color-coded lights that can be seen through the rearview mirror or by turning around.

How the System Works

URPA comes on automatically when the shift lever is moved into REVERSE (R) and the vehicle speed is less than 3 mph (5 km/h). When the system turns on, the three lights on the display will illuminate for one and a half seconds to let you know that the system is working. If your vehicle is moving in REVERSE (R) at a speed greater than 3 mph (5 km/h), the red light will flash to remind you that the system does not work at a speed greater than 3 mph (5 km/h).

If an object is detected at a REVERSE (R) speed of less than 3 mph (5 km/h), one of the following will occur:

Description

English

Metric

Amber light

5 ft

1.5 m

Amber/amber lights

40 in

1.0 m

Amber/amber/red lights & continuous chime

20 in

0.5 m

Amber/amber/red lights flashing & continuous chime

1 ft

0.3 m

A chime will sound the first time an object is detected between 20 inches (0.5 m) and 5 feet (1.5 m) away.

URPA cannot detect objects that are above trunk 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 to Work Properly

The light may flash red when the vehicle is in REVERSE (R), if the ultrasonic sensors are not kept clean. So be sure to keep your rear bumper free of mud, dirt, snow, ice and slush. Other conditions that may affect system performance include things like the vibrations from a jackhammer or the compression of air brakes on a very large truck. If after cleaning the rear bumper and then driving forward at least 15 mph (25 km/h), the display continues to flash red, see your dealer.

If 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 light may also flash red. The light will continue to flash whenever in REVERSE (R) until your vehicle is driven forward at least 15 mph (25 km/h) without any obstructions behind the vehicle.

For cleaning instructions, see Washing Your Vehicle .