9-58
Driving and Operating
How the System Works
URPA comes on automatically
when the shift lever is moved into
R (Reverse). A single tone sounds
to indicate the system is working.
URPA operates only at speeds less
than 8 km/h (5 mph).
An obstacle is indicated by audible
beeps. The interval between the
beeps becomes shorter as the
vehicle gets closer to the obstacle.
When the distance is less than
30 cm (12 in) the beeps are
continuous.
To be detected, objects must be at
least 25.4 cm (10 in) off the ground
and below tailgate level. Objects
must also be within 2.5 m (8 ft) from
the rear bumper. This distance may
be less during warmer or humid
weather.
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
‑
43
.
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
‑
93
.
.
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
Summary of Contents for 2011 Sierra Denali
Page 6: ...vi Introduction 2 NOTES...
Page 8: ...1 2 In Brief Instrument Panel United States Version Shown Canada Similar...
Page 54: ...2 22 Keys Doors and Windows 2 NOTES...
Page 116: ...3 62 Seats and Restraints 2 NOTES...
Page 131: ...Instruments and Controls 5 13 Instrument Cluster English Shown Metric Similar...
Page 180: ...5 62 Instruments and Controls 2 NOTES...
Page 246: ...7 58 Infotainment System 2 NOTES...
Page 344: ...9 92 Driving and Operating 2 NOTES...
Page 350: ...10 6 Vehicle Care Engine Compartment Overview 6 2 L V8 Engine Shown 6 0 L V8 Engine Similar...
Page 480: ...13 18 Customer Information 2 NOTES...