Oldsmobile 2001 Silhouette - Manual (Page 211)

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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.
It may also flash red if the ultrasonic sensors are not
kept clean. So be sure to keep your rear bumper free
of mud, dirt, snow, ice and slush or the system may
not work properly. If after cleaning the rear bumper and
driving forward at least 15 mph (25 km/h), the display
continues to flash red, see your dealer.
It will also flash red if your vehicle is moving in
REVERSE (R) at a speed greater than 3 mph (5 km/h).
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.
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 cleaning instructions, see “Cleaning Your Vehicle”
in the Index.