Chevrolet 2007 Avalanche Owner's Manual page 225

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The ultrasonic sensors are not kept clean.
So, be sure to keep your vehicle's rear
bumper free of mud, dirt, snow, ice, and
slush. For cleaning instructions, see Washing
Your Vehicle on page 541. If the DIC still
displays the PARKING ASSIST OFF
message after cleaning the bumper and
driving forward at a speed of at least
15 mph (25 km/h), see your dealer.
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Other conditions that may affect system
performance include vibrations from a
jackhammer or the compression of air brakes
on a very large truck or other mechanical
devices that interfere with URPA performance.
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When URPA is disabled without driver
action and the driver attempts to turn
URPA back on by pressing the rear park
aid button, the indicator light will flash
for 3 seconds and then stay lit to indicate
that URPA is off.
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 Driver Information Center messages
related to URPA, see DIC Warnings and
Messages on page 267.
If the vehicle bumper is damaged, the URPA
system may not work properly. Take the
vehicle to your dealer to repair the system.
I n f o r ma t i o n P r o v i d e d b y :
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