2008 GMC YUKON window

If it is, turn the steering wheel left and right while
you turn the key hard. If none of this works,
then your vehicle needs service.
B (ACC/ACCESSORY):This position lets things like
the radio and the windshield wipers operate while
the engine is off.
Lengthy operation of features such as the radio in the
ACC/ACCESSORY ignition position and the ON/RUN
position may drain the battery and prevent your vehicle
from starting. Do not operate your vehicle in the ACC/
ACCESSORY ignition position for a long period of time.
C (ON/RUN):This is the position for driving. It is the
position the ignition switch returns to after the engine
starts, and the key is released.
The battery could be drained if you leave the key in the
ACC/ACCESSORY or ON/RUN position with the
engine off. You may not be able to start your vehicle if
the battery is allowed to drain for an extended period
of time.
D (START):This position starts the engine.Key In the Ignition
Never leave your vehicle with the keys inside, as it is an
easy target for joy riders or thieves. If you leave the
key in the ignition and park your vehicle, a chime
will sound, when you open the driver’s door. Always
remember to remove your key from the ignition and take
it with you. This will lock your ignition and transmission.
Also, always remember to lock the doors.
The battery could be drained if you leave the key in the
ignition while your vehicle is parked. You may not be
able to start your vehicle after it has been parked for an
extended period of time.
Retained Accessory Power (RAP)
The following vehicle accessories can be used for up to
10 minutes after the engine is turned off:
Audio System
Power Windows
OnStar®System (if equipped)
Sunroof (if equipped)
These features work when the key is in ON/RUN or
ACC/ACCESSORY. Once the key is turned from
ON/RUN to LOCK/OFF, the windows and sunroof
continue to work up to 10 minutes until any door
is opened. The radio continues to work for up to
10 minutes or until the driver’s door is opened.
2-27

Engine Exhaust
{CAUTION:
Engine exhaust can kill. It contains the gas
carbon monoxide (CO), which you cannot see or
smell. It can cause unconsciousness and death.
You might have exhaust coming in if:
The exhaust system sounds strange or
different.
Your vehicle gets rusty underneath.
Your vehicle was damaged in a collision.
Your vehicle was damaged when driving
over high points on the road or over road
debris.
CAUTION: (Continued)
CAUTION: (Continued)

Repairs were not done correctly.
Your vehicle or the exhaust system has
been modied improperly.
If you ever suspect exhaust is coming into
your vehicle:
Drive it only with all the windows down to
blow out any CO; and
Have your vehicle xed immediately.
2-47

Temperature and Compass Display
Press the on/off button, located to the far left, briey to
turn the compass/temperature display on or off.
If the display reads CAL, the compass needs to be
calibrated. For more information, see “Compass
Calibration” following.
To adjust between Fahrenheit and Celsius:
1. Press and hold the on/off button for approximately
four seconds until either a ashing F or C appears.
2. Press the button again to change the display to the
desired unit of measurement. After approximately
four seconds of inactivity, the new unit will be locked
in and the compass/temperature display will
return.
If an abnormal temperature reading is displayed for an
extended period of time, see your dealer/retailer.
Under certain circumstances, a delay in updating the
temperature is normal.
Automatic Dimming Mirror Operation
The automatic dimming mirror comes on each time the
ignition is turned to start. To turn the automatic
dimming feature off or back on, press the on/off button.
The indicator light on the mirror is lit when the
automatic dimming feature is on.
Compass Calibration
The compass may need calibration if one of the
following occurs:
After approximately ve seconds, the display does
not show a compass heading, N for North, for
example, there may be a strong magnetic eld
interfering with the compass. Such interference may
be caused by a magnetic antenna mount, magnetic
note pad holder, or a similar magnetic item.
The compass does not display the correct heading
and the compass zone variance is set correctly.
In order to calibrate, CAL must be displayed in the
mirror compass windows. If CAL is not displayed, push
the on/off button for approximately 12 seconds or
until CAL is displayed.
The compass can be calibrated by driving the vehicle in
circles at 5 mph (8 km/h) or less until the display
reads a direction.
Compass Variance
The mirror is set in zone eight upon leaving the factory.
It will be necessary to adjust the compass to
compensate for compass variance if the vehicle is
outside of zone eight. Under certain circumstances, as
during a long distance cross-country trip, it will be
necessary to adjust for compass variance.
2-50

In order to calibrate, CAL must be displayed in the
mirror compass windows. If CAL is not displayed, push
in the compass/temperature button for approximately
nine seconds or until CAL is displayed.
The compass can be calibrated by driving the vehicle in
circles at 5 mph (8 km/h) or less until the display
reads a direction.
Compass Variance
The mirror is set in zone eight upon leaving the factory.
It will be necessary to adjust the compass to
compensate for compass variance if the vehicle is
outside zone eight. Under certain circumstances, as
during a long distance cross-country trip, it will be
necessary to adjust for compass variance. Compass
variance is the difference between earth’s magnetic
north and true geographic north. If not adjusted
to account for compass variance, your compass could
give false readings.To adjust for compass variance:
1. Find your current location and variance zone
number on the following zone map.
2. Press and hold the compass/temperature button for
six seconds until a zone number appears in the
display.
3. Press the compass/temperature button on the
bottom of the mirror until the new zone number
appears in the display. After you stop pressing the
button, the display will show a compass direction
within a few seconds.
2-53

Your vehicle may have outside heated mirrors which
help clear them of condensation, snow, and ice. When
the rear window defogger button is pressed, the
heated mirrors are also turned on. Only the upper glass
of the mirror is heated. The lower convex part of the
mirror is not heated.
Your mirror may also have a turn signal arrow that will
ash in the direction of the turn or lane change.
Outside Power Mirrors
If your vehicle is equipped
with outside power mirrors,
the controls are located
on the driver’s door
armrest.
Press (A) to select the driver’s side mirror or (B) to
select the passenger’s side mirror. Press either (A)
or (B) again to deselect the mirror.To adjust each mirror, press one of the four arrows
located on the control pad to move the mirror in
the direction you want it to go. Adjust each outside
mirror so that you can see a little of your vehicle, and
the area behind your vehicle.
The mirrors may also include a memory function that
works with the memory seats. SeeMemory Seat,
Mirrors, and Pedals on page 1-6for more information.
The mirrors can be manually folded inward to prevent
damage when going through an automatic car wash. To
fold, push the mirror toward the vehicle. To return the
mirror to its original position, push outward. Be sure
to return both mirrors to their original unfolded position
before driving.
2-55

Outside Automatic Dimming Mirror
If your vehicle has this feature, the driver’s outside mirror
will adjust for the glare of headlamps behind you. This
feature is controlled by the on and off settings found
on the electrochromic inside mirror. SeeAutomatic
Dimming Rearview Mirror with OnStar
®, Compass and
Temperature Display on page 2-49orAutomatic
Dimming Rearview Mirror with Compass and
Temperature Display on page 2-52for more information.
Park Tilt Mirrors
If your vehicle has the memory package, the outside
mirrors are able to perform the park tilt function.
This feature may be useful in allowing the driver to view
the curb when parallel parking. This feature will cause
the passenger side mirror and/or driver side mirror to tilt
to a preselected position when the vehicle is in
REVERSE (R).
The passenger side mirror and/or the driver side mirror
will return to its original position when the vehicle is
shifted out of REVERSE (R) or the ignition is turned to off.
This feature can be turned on or off through the Driver
Information Center (DIC). SeeDIC Vehicle
Customization (With DIC Buttons) on page 3-72for
more information.
Outside Convex Mirror
{CAUTION:
A convex mirror can make things (like other
vehicles) look farther away than they really are.
If you cut too sharply into the right lane, you
could hit a vehicle on your right. Check your
inside mirror or glance over your shoulder
before changing lanes.
The passenger side mirror may have convex glass. A
convex mirror’s surface is curved so more can be seen
from the driver’s seat. It also makes things like other
vehicles, look farther away than they really are.
Outside Heated Mirrors
The vehicle may have outside heated mirrors which
help clear them of condensation, snow, and ice.
When the rear window defogger button is pressed, the
heated mirrors are also turned on. See “Rear Window
Defogger” underDual Automatic Climate Control System
on page 3-26orClimate Control System on page 3-23
for more information.
2-57

Object Detection Systems
Ultrasonic Rear Parking
Assist (URPA)
If your vehicle has the Ultrasonic Rear Parking
Assist (URPA) system, it helps you park easier
and avoid other vehicles while in REVERSE (R).
It operates at speeds less than 5 mph (8 km/h).
It can determine how close objects are to the rear
bumper, up to 8 feet (2.5 m) behind your vehicle.
The distance sensors are located on the rear bumper.
{CAUTION:
The Ultrasonic Rear Parking Assist (URPA)
system does not replace driver vision.
It cannot detect:
objects that are below the bumper,
underneath the vehicle, or if they are
too close or far from the vehicle
children, pedestrians, bicyclists, or pets.
CAUTION: (Continued)
CAUTION: (Continued)
If you do not use proper care before and while
backing; vehicle damage, injury, or death could
occur. Even with URPA, always check behind
your vehicle before backing up. While backing,
be sure to look for objects and check your
vehicle’s mirrors.
On some vehicles
this display is located
near the passenger side
rear window and can
be seen by looking over
your right shoulder.
If your vehicle has the display, there are
three color-coded lights to provide distance and
system information.
If your vehicle does not have the display and it
has URPA, you will hear the beeps as described
in the following information.
2-58

Instrument Panel Overview...............................3-4
Hazard Warning Flashers................................3-6
Other Warning Devices...................................3-6
Horn.............................................................3-6
Tilt Wheel.....................................................3-6
Turn Signal/Multifunction Lever.........................3-7
Turn and Lane-Change Signals........................3-8
Headlamp High/Low-Beam Changer..................3-9
Flash-to-Pass.................................................3-9
Windshield Wipers..........................................3-9
Rainsense™ II Wipers...................................3-10
Windshield Washer.......................................3-11
Rear Window Wiper/Washer...........................3-12
Cruise Control..............................................3-13
Exterior Lamps.............................................3-16
Headlamps on Reminder................................3-17
Daytime Running Lamps (DRL).......................3-17
Automatic Headlamp System..........................3-18
Fog Lamps..................................................3-19
Auxiliary Roof Mounted Lamp.........................3-19
Instrument Panel Brightness...........................3-20
Dome Lamps...............................................3-20
Dome Lamp Override....................................3-20
Entry Lighting...............................................3-20
Exit Lighting.................................................3-20
Reading Lamps............................................3-21
Electric Power Management...........................3-21Battery Run-Down Protection..........................3-22
Accessory Power Outlet(s).............................3-22
Ashtray(s) and Cigarette Lighter......................3-23
Climate Controls............................................3-23
Climate Control System.................................3-23
Dual Automatic Climate Control System...........3-26
Outlet Adjustment........................................
.3-33
Rear Air Conditioning and Heating System.......3-33
Rear Air Conditioning and Heating System
and Electronic Climate Controls...................3-35
Warning Lights, Gages, and Indicators............3-37
Instrument Panel Cluster................................3-38
Speedometer and Odometer...........................3-39
Trip Odometer..............................................3-39
Tachometer.................................................3-39
Safety Belt Reminders...................................3-39
Airbag Readiness Light..................................3-40
Passenger Airbag Status Indicator...................3-41
Charging System Light..................................3-43
Voltmeter Gage............................................3-44
Brake System Warning Light..........................3-44
Antilock Brake System
Warning Light...........................................3-46
StabiliTrak
®Indicator Light..............................3-46
Engine Coolant Temperature Gage..................3-47
Tire Pressure Light.......................................3-47
Section 3 Instrument Panel
3-1