Chevrolet VENTURE 2001, Manual, Page: 233 / 460

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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 the vehicle is 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 your
vehicle is driven forward at least 15 mph (25 km/h)
without any obstructions behind the vehicle.
It will 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 may 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.