Pontiac 2003 Montana Owner's Manual page 198

URPA can be turned off by
pressing the rear park aid
disable switch located
in the instrument panel
switchbank. When
the system is disabled an
indicator light will be lit
on the switch. You will not
see any lights on the
rear display if the switch is
in the off position.
How the System Works
Unless disabled, the URPA will turn on automatically
when the shift lever is moved into REVERSE (R). 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),
does not work at speed greater than 3 mph (5 km/h).
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If an object is detected at a REVERSE (R) speed of
less than 3 mph (5 km/h), one of the following will occur:
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 liftgate level.
In order for the rear sensors to recognize an object, it
must be within detection range behind the vehicle.
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