Black plate (75,1)
GMC Sierra Owner Manual - 2011
Driving and Operating
9-75
The system can be disabled by
pressing the rear park aid disable
button located next to the radio.
The indicator light comes on and
PARK ASSIST OFF displays on the
Driver Information Center (DIC) to
indicate that URPA is off; see
Object
Detection System Messages on
page 5
‑
45
.
Notice:
If you use URPA while the
tailgate is lowered, it may not
detect an object behind your
vehicle, and you might back into
the object and damage your
vehicle. Always verify the tailgate
is closed when using URPA or
turn off URPA when driving with
the tailgate lowered.
When the System Does Not
Seem to Work Properly
The following messages may be
displayed on the DIC:
SERVICE PARK ASSIST:
If this
message occurs, take the vehicle to
your dealer to repair the system.
PARK ASSIST OFF:
This message
occurs if the driver disables the
system.
PARK ASST BLOCKED SEE
OWNERS MANUAL:
This
message can occur under the
following conditions:
.
The ultrasonic sensors are not
clean. Keep the vehicle's rear
bumper free of mud, dirt, snow,
ice, and slush. For cleaning
instructions, see
“
Washing the
Vehicle
”
under
Exterior Care on
page 10
‑
102
.
.
The park assist sensors are
covered by frost or ice. Frost or
ice can form around and behind
the sensors and may not always
be seen; this can occur after
washing the vehicle in cold
weather. The message may not
clear until the frost or ice has
melted.
.
A trailer was attached to the
vehicle, or a bicycle or an object
was hanging out of the tailgate
during the last drive cycle. Once
the attached object is removed
and the tailgate is raised, URPA
will return to normal operation.
.
A tow bar is attached to the
vehicle.
.
The vehicle's bumper is
damaged. Take the vehicle to
your dealer to repair the system.
.
Other conditions are affecting
system performance. Examples
of this are vibrations from a
jackhammer or the compression
of air brakes on a very large
truck.
