Cadillac ESCALADE EXT 2002, Manual

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How the System Works
URPA comes 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 comes on, the
three lights on the display will illuminate to let you
know that the system is working. URPA senses how
close your vehicle is to an object. The distance is
determined by the four ultrasonic sensors located on the
rear bumper. When you shift into REVERSE (R) and an
object is detected, the following will occur in sequence
depending on the distance from the object:
D At 5 feet (1.5 m) a chime will sound and one amber
light will be lit;
D at 40 inches (1.0 m) both amber lights will be lit;
D at 20 inches (0.5 m) a continuous chime will sound
and all three lights (amber/amber/red) will be lit; and
D at 1 foot (0.3 m) a continuous chime will sound and
all three lights (amber/amber/red) will flash.
URPA 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 the center of the Cadillac crest
badge on the tailgate. In order for the rear sensors to
recognize an object, it must be within operating range.
NOTICE:
The URPA system will not work correctly with
the tailgate lowered. You could damage your
vehicle by backing into an object before URPA
detects it. Turn off the URPA system when
driving with the tailgate lowered.