Oldsmobile 2002 Silhouette - Manual (Page 202)

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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:
D Amber/amber/red lights flashing and
continuous chime.....................................1 ft. (0.3 m)
D Amber/amber/red lights and
continuous chime...................................20 in. (0.5 m)
D Amber/amber lights...............................40 in. (1.0 m)
D Amber light..............................................5 ft. (1.5 m)
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.