2001 Oldsmobile Silhouette Owner's Manual - Page 202

How the System Works If the rear park aid disable switch is not on, the rear parking assist turns 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 1.5 seconds to let you know that the system is working. Rear parking assist senses how close your vehicle is to an object. The distance is determined by the four ultrasonic sensors located on the rear bumper. When shifting into REVERSE (R) and an object is detected, one of the following will occur: A chime will sound the first time an object is detected, if the object is between 20 inches (0.5 cm) and 5 feet (1.5 m) away. Rear parking assist can detect objects 3 inches (7.6 cm) and wider, and at least 10 inches (25.4 cm) tall, but it cannot detect objects that are above liftgate level. In order for the rear sensors to recognize an object, it must be within operating range. If the rear parking assist system is not functioning properly, the display will flash red, indicating that there is a problem unless, the disable switch is on. The light will also flash red when shifting into REVERSE (R) if a trailer was attached to your vehicle, or if a bicycle or an object was on the back of, or hanging out of your liftgate during your last drive cycle. The light will continue to flash, whenever in REVERSE (R), until the vehicle is driven forward at least at 15 mph (25 km/h) without any obstructions behind the vehicle. D Amber/amber/red lights flashing and D Amber/amber/red lights and continuous chime...1 ft. (0.3 m) continuous chime...20 in. (0.5 m) D Amber/amber lights...40 in. (1.0 m) D Amber light...5 ft. (1.5 m) 2-120