GMC 2008 Owner's manual

Seats and Restraint Systems

........................... 1-1

Front Seats

............................................... 1-2

Rear Seats

.............................................. 1-11

Safety Belts

............................................. 1-30

Child Restraints

....................................... 1-51

Airbag System

......................................... 1-76

Restraint System Check

............................ 1-92

Features and Controls

..................................... 2-1

Keys

........................................................ 2-3

Doors and Locks

...................................... 2-10

Windows

................................................. 2-19

Theft-Deterrent Systems

............................ 2-22

Starting and Operating Your Vehicle

........... 2-26

Mirrors

.................................................... 2-49

Object Detection Systems

.......................... 2-58

OnStar

®

System

...................................... 2-60

Universal Home Remote System

................ 2-64

Storage Areas

......................................... 2-71

Sunroof

.................................................. 2-74

Instrument Panel

............................................. 3-1

Instrument Panel Overview

.......................... 3-4

Climate Controls

...................................... 3-23

Warning Lights, Gages, and Indicators

........ 3-37

Driver Information Center (DIC)

.................. 3-55

Audio System(s)

....................................... 3-81

Driving Your Vehicle

....................................... 4-1

Your Driving, the Road, and Your Vehicle

..... 4-2

Towing

................................................... 4-45

Service and Appearance Care

.......................... 5-1

Service

..................................................... 5-3

Fuel

......................................................... 5-5

Checking Things Under the Hood

............... 5-12

Rear Axle

............................................... 5-52

Four-Wheel Drive

..................................... 5-54

Front Axle

............................................... 5-55

Headlamp Aiming

..................................... 5-56

Bulb Replacement

.................................... 5-59

Windshield Wiper Blade Replacement

......... 5-62

Tires

...................................................... 5-64

Appearance Care

................................... 5-108

Vehicle Identiﬁcation

............................... 5-116

Electrical System

.................................... 5-117

Capacities and Speciﬁcations

................... 5-124

Maintenance Schedule

..................................... 6-1

Maintenance Schedule

................................ 6-2

Customer Assistance Information

.................... 7-1

Customer Assistance and Information

........... 7-2

Reporting Safety Defects

........................... 7-14

Vehicle Data Recording and Privacy

........... 7-16

Index

................................................................ 1

2008 GMC Yukon, Yukon XL Owner Manual M

GENERAL MOTORS, GM, the GM Emblem, GMC, the

GMC Truck Emblem, and the name YUKON are

registered trademarks of General Motors Corporation.

This manual includes the latest information at the time it

was printed. We reserve the right to make changes

after that time without further notice. For vehicles ﬁrst

sold in Canada, substitute the name “General Motors of

Canada Limited” for GMC whenever it appears in this

manual.

This manual describes features that may be available in

this model, but your vehicle may not have all of them.

For example, more than one entertainment system may

be offered or your vehicle may have been ordered

without a front passenger or rear seats.

Keep this manual in the vehicle, so it will be there if it is

needed while you are on the road. If the vehicle is

sold, leave this manual in the vehicle.

Canadian Owners

A French language copy of this manual can be obtained

from your dealer/retailer or from:

Helm, Incorporated

P.O. Box 07130

Detroit, MI 48207

1-800-551-4123

www.helminc.com

Propriétaires Canadiens

On peut obtenir un exemplaire de ce guide en français

auprès de concessionnaire ou à l’adresse suivante:

Helm Incorporated

P.O. Box 07130

Detroit, MI 48207

1-800-551-4123

www.helminc.com

Litho in U.S.A.

Part No. 15854805 A First Printing

©

ii

Using this Manual

Many people read the owner manual from beginning to

end when they ﬁrst receive their new vehicle to learn

about the vehicle’s features and controls. Pictures

and words work together to explain things.

If your vehicle is a Two-mode Hybrid, see the Two-mode

Hybrid manual for more information.

Index

A good place to quickly locate information about the

vehicle is the Index in the back of the manual. It is an

alphabetical list of what is in the manual and the

page number where it can be found.

Safety Warnings and Symbols

There are a number of safety cautions in this book. A

box with the word CAUTION is used to tell about things

that could hurt you or others if you were to ignore the

warning.

{CAUTION:

These mean there is something that could hurt

you or other people.

We tell you what the hazard is and what to do to help

avoid or reduce the hazard. Please read these cautions.

If you do not, you or others could be hurt.

A circle with a slash

through it is a safety

symbol which means “Do

Not,” “Do Not do this”

or “Do Not let this happen.”

iii

Vehicle Damage Warnings

You will also ﬁnd notices in this manual.

Notice: These mean there is something that could

damage your vehicle.

A notice tells about something that can damage the

vehicle. Many times, this damage would not be covered

by your vehicle’s warranty, and it could be costly.

The notice tells what to do to help avoid the damage.

When you read other manuals, you might see

CAUTION and NOTICE warnings in different colors

or in different words.

There are also warning labels on the vehicle which use

the same words, CAUTION or NOTICE.

Vehicle Symbols

The vehicle has components and labels that use

symbols instead of text. Symbols are shown along with

the text describing the operation or information

relating to a speciﬁc component, control, message,

gage, or indicator.

iv

Front Seats ......................................................1-2

Manual Seats ................................................1-2

Power Seats ..................................................1-3

Manual Lumbar ..............................................1-4

Power Lumbar ...............................................1-4

Heated Seats .................................................1-5

Memory Seat, Mirrors, and Pedals ....................1-6

Reclining Seatbacks ........................................1-8

Head Restraints ............................................1-10

Center Seat .................................................1-11

Rear Seats .....................................................1-11

Heated Seats ...............................................1-11

60/40 Split Bench Seat (Second Row) .............1-12

Bucket Seats (Second Row) ...........................1-18

Third Row Seat ............................................1-25

Safety Belts ...................................................1-30

Safety Belts: They Are for Everyone ................1-30

How to Wear Safety Belts Properly .................1-35

Lap-Shoulder Belt .........................................1-43

Safety Belt Use During Pregnancy ..................1-49

Lap Belt ......................................................1-49

Safety Belt Extender .....................................1-50

Child Restraints .............................................1-51

Older Children ..............................................1-51

Infants and Young Children ............................1-54

Child Restraint Systems .................................1-57

Where to Put the Restraint .............................1-60

Lower Anchors and Tethers for

Children (LATCH) ......................................1-61

Securing a Child Restraint in a Rear Seat

Position ...................................................1-69

Securing a Child Restraint in the Center

Front Seat Position ....................................1-71

Securing a Child Restraint in the Right

Front Seat Position ....................................1-72

Airbag System ...............................................1-76

Where Are the Airbags?

................................1-78

When Should an Airbag Inﬂate? .....................1-81

What Makes an Airbag Inﬂate? .......................1-83

How Does an Airbag Restrain? .......................1-83

What Will You See After an Airbag Inﬂates? .....1-84

Passenger Sensing System ............................1-85

Servicing Your Airbag-Equipped Vehicle ...........1-90

Adding Equipment to Your Airbag-Equipped

Vehicle ....................................................1-90

Restraint System Check ..................................1-92

Checking the Restraint Systems ......................1-92

Replacing Restraint System Parts

After a Crash ............................................1-93

Section 1 Seats and Restraint Systems

1-1

Front Seats

Manual Seats

{CAUTION:

You can lose control of the vehicle if you try to

adjust a manual driver’s seat while the vehicle

is moving. The sudden movement could startle

and confuse you, or make you push a pedal

when you do not want to. Adjust the driver’s

seat only when the vehicle is not moving.

To move a manual seat forward or rearward:

1. Lift the bar to unlock

the seat.

2. Slide the seat to the

desired position and

release the bar.

Try to move the seat with your body to be sure the seat

is locked in place.

1-2

Power Seats

On a vehicle with power seats, the controls used to

operate them are located on the outboard side of the

seats. To adjust the seat, do any of the following:

• Move the seat forward or rearward by sliding the

control forward or rearward.

• Raise or lower the front part of the seat cushion by

moving the front of the control up or down.

• Raise or lower the rear part of the seat cushion by

moving the rear of the control up or down.

• Raise or lower the entire seat by moving the entire

control up or down.

On seats with power reclining seatbacks, the control is

located behind the power seat control on the outboard

side of the seats. See “Power Reclining Seatbacks”

under Reclining Seatbacks on page 1-8.

A vehicle with a memory function allows seat settings to

be saved and recalled. See Memory Seat, Mirrors,

and Pedals on page 1-6 for more information.

Driver’s Seat with Power Seat Control, Power

Recline, and Power Lumbar shown

1-3

Manual Lumbar

On vehicles with this feature, turn the knob forward or

rearward to increase or decrease lumbar support.

Power Lumbar

If the seats have power lumbar, the controls used to

operate this feature are located on the outboard side of

the seats.

• To increase lumbar support, press and hold the

front of the control.

• To decrease lumbar support, press and hold the

rear of the control.

1-4

• To raise the height of the lumbar support, press

and hold the top of the control.

• To lower the height of the lumbar support, press

and hold the bottom of the control.

Release the control when the lower seatback reaches

the desired level of lumbar support.

Your vehicle may have a memory function which allows

seat settings to be saved and recalled. See Memory

Seat, Mirrors, and Pedals on page 1-6 for more

information.

Keep in mind that as your seating position changes, as

it may during long trips, so should the position of

your lumbar support. Adjust the seat as needed.

Heated Seats

On vehicles with heated front seats, the controls are

located on the driver’s and passenger’s doors.

I(Heated Seatback): Press to turn on the heated

seatback.

J(Heated Seat and Seatback): Press to turn on the

heated seat and seatback.

The light on the button will come on to indicate that the

feature is working. Press the button to cycle through

the temperature settings of high, medium, and low and

to turn the heat to the seat off. Indicator lights will

show the level of heat selected: three for high, two for

medium, and one for low.

The heated seats will be canceled ten seconds after the

ignition is turned off. To use the heated seat feature

after restarting your vehicle, press the heated seat

or seatback button again.

1-5

Memory Seat, Mirrors, and Pedals

Your vehicle may have the memory package.

The controls for this

feature are located on the

driver’s door panel, and

are used to program

and recall memory settings

for the driver’s seat,

outside mirrors, and the

adjustable throttle and

brake pedal.

To save your positions in memory, do the following:

1. Adjust the driver’s seat, including the seatback

recliner and lumbar, both outside mirrors, and

the throttle and brake pedals to a comfortable

position.

See Outside Power Mirrors on page 2-55 and

Adjustable Throttle and Brake Pedal on page 2-29

for more information.

Not all mirrors will have the ability to save and

recall their positions.

Not all adjustable throttles and brake pedals will

have the ability to save and recall their positions.

2. Press and hold button 1 until two beeps are heard

indicating that the position has been stored.

A second seating, mirror, and throttle and brake pedal

position can be programmed by repeating the above

steps and pressing button 2.

To recall the memory positions, the vehicle must be in

PARK (P). Press and release either button 1 or button 2

corresponding to the desired driving position. The

seat, outside mirrors, and adjustable throttle and brake

pedals will move to the position previously stored.

You will hear a single beep.

1-6

If you use the remote keyless entry transmitter to enter

your vehicle and the remote recall memory feature

is on, automatic seat, adjustable mirror, and adjustable

pedal movements will occur. See “MEMORY SEAT

RECALL” under DIC Vehicle Customization (With DIC

Buttons) on page 3-72 for more information.

To stop recall movement of the memory function at any

time, press one of the power seat controls, memory

buttons, power mirror buttons, or adjustable pedal

switch.

If something has blocked the driver’s seat and/or the

adjustable pedals while recalling a memory position, the

driver’s seat and/or the adjustable pedals recall may

stop working. If this happens, remove the obstruction

and press the appropriate control for the area that is not

responding for two seconds. Try recalling the memory

position again by pressing the appropriate memory

button. If the memory position is still not recalling, see

your dealer for service.

Easy Exit Seat

The control for this feature is located on the driver’s

door panel between buttons 1 and 2.

With the vehicle in PARK (P), the driver’s seat exit

position can be recalled by pressing the exit button. You

will hear a single beep, and the driver’s seat will

move back.

If the easy exit seat feature is programmed in the Driver

Information Center (DIC), automatic seat movement

will occur when the key is removed from the ignition.

See “EASY EXIT SEAT” under DIC Vehicle

Customization (With DIC Buttons) on page 3-72 for

more information.

The memory seat and easy exit features can also be

programmed using the DIC.

For programming information, see DIC Vehicle

Customization (With DIC Buttons) on page 3-72.

1-7

Reclining Seatbacks

Manual Reclining Seatbacks

{CAUTION:

You can lose control of the vehicle if you try to

adjust a manual driver’s seat while the vehicle

is moving. The sudden movement could startle

and confuse you, or make you push a pedal

when you do not want to. Adjust the driver’s

seat only when the vehicle is not moving.

{CAUTION:

If the seatback is not locked, it could move

forward in a sudden stop or crash. That could

cause injury to the person sitting there. Always

push and pull on the seatback to be sure it is

locked.

1-8

{CAUTION:

Sitting in a reclined position when your vehicle

is in motion can be dangerous. Even if you

buckle up, your safety belts cannot do their

job when you are reclined like this.

The shoulder belt cannot do its job. In a crash,

you could go into it, receiving neck or other

injuries.

The lap belt cannot do its job either. In a crash

the belt could go up over your abdomen. The

belt forces would be there, not at your pelvic

bones. This could cause serious internal

injuries.

For proper protection when the vehicle is in

motion, have the seatback upright. Then sit

well back in the seat and wear your safety belt

properly.

On seats with manual reclining seatbacks, the lever

used to operate them is located on the outboard side of

the seat(s).

To recline the seatback:

1. Lift the recline lever.

2. Move the seatback to the desired position, then

release the lever to lock the seatback in place.

3. Push and pull on the seatback to make sure it is

locked.

To return the seatback to an upright position, do the

following:

1. Lift the lever fully without applying pressure to the

seatback and the seatback will return to the upright

position.

2. Push and pull on the seatback to make sure it is

locked.

1-9

Power Reclining Seatbacks

If the seats have power reclining seatbacks, the control

used to recline them is located on the outboard side

of the seat behind the power seat control.

• To recline the seatback, tilt the top of the control

rearward.

• To bring the seatback forward, tilt the top of the

control forward.

Do not have a seatback reclined if your vehicle is

moving.

Head Restraints

Adjust the head restraint so that the top of the restraint

is at the same height as the top of the occupant’s

head. This position reduces the chance of a neck injury

in a crash.

1-10

Pull the head restraint up

to raise it. To lower the

head restraint, press

the release button (A),

located on the top of

the seatback, while

you push the head

restraint down.

The front seats may have head restraints that also tilt

forward and rearward.

To tilt the head restraint, grasp the top of the restraint

while pressing the button (B), located on the inboard

side of the head restraint, and move it forward or

rearward until the desired locking position is reached.

Try to move the head restraint after the button is

released to make sure that it is locked in place.

The second row seats may have head rests that can be

adjusted up and down, but they do not tilt.

Center Seat

Your vehicle may have a front center seat. The seatback

doubles as an armrest and cupholder/storage area for

the driver and passenger when the center seat is

not used. Do not use it as a seating position when the

seatback is folded down.

Rear Seats

Heated Seats

If the rear seats have the

heated seat feature, the

buttons used to control this

feature are located on

the Rear Seat Audio (RSA)

panel.

M (Heated Seat): To heat the seat cushion, press the

button with the heated seat symbol.

Driver’s Side RSA

Heated Seat Button

Only shown

1-11

A heated seat symbol will be shown in the RSA display

to indicate that the feature is on. Press the button to

cycle through the temperature settings of high, medium,

and low, and to turn it off. Indicator bars next to the

symbol will designate the level of heat selected: three for

high, two for medium, and one for low.

The heated seats are off when the ignition is off.

60/40 Split Bench Seat

(Second Row)

If your vehicle has a 60/40 split bench, the seat(s) can

be folded for additional cargo space or folded and

tumbled for easy entry and exit to the third row seats, if

your vehicle has them. These seats will have either

the manual fold and tumble feature or the automatic seat

release fold and tumble feature.

Manual Fold and Tumble Feature

Folding and Tumbling the Seat(s)

To fold and tumble the seat, do the following:

1. Make sure that there is nothing under, in front of, or

on the seat.

Notice: Folding a rear seat with the safety belts

still fastened may cause damage to the seat or the

safety belts. Always unbuckle the safety belts

and return them to their normal stowed position

before folding a rear seat.

2. Lift the lever, located on the outboard side of the

seat, to release the seatback.

1-12

The seatback will fold forward automatically.

Leaving the seatback in this position creates a ﬂat

load ﬂoor.

If the seatback cannot fold ﬂat, try moving the front

seat forward and/or put the front seatback in the

upright position.

3. Lift the same lever

again to release the

rear of the seat

from the ﬂoor. The seat

will tumble forward.

1-13

Returning the Seat(s) to the Sitting

Position

To return the seat to the sitting position, do the following:

1. Pull the seat down until it latches to the ﬂoor. The

seatback cannot be raised if the seat is not latched

to the ﬂoor.

{CAUTION:

If the seatback is not locked, it could move

forward in a sudden stop or crash. That could

cause injury to the person sitting there. Always

push and pull on the seatback to be sure it is

locked.

2. Lift the seatback and push it rearward. Push and

pull on the seatback to make sure it is locked.

{CAUTION:

A safety belt that is improperly routed, not

properly attached, or twisted will not provide

the protection needed in a crash. The person

wearing the belt could be seriously injured.

After raising the rear seatback, always check

to be sure that the safety belts are properly

routed and attached, and are not twisted.

3. Make sure the safety belt in the center seating

position is not caught between the two seats

and is not twisted.

1-14

Folding and Tumbling the Seat(s) from the

Third Row Seats

{CAUTION:

Using the third row seating position while the

second row is folded, or folded and tumbled,

could cause injury in a sudden stop or crash.

Be sure to return the seat to the passenger

seating position. Push and pull on the seat to

make sure it is locked into place.

To fold and tumble the seat from the third rows, if your

vehicle has them, do the following:

1. Make sure that there is nothing under, in front of, or

on the seat.

Notice: Folding a rear seat with the safety belts

still fastened may cause damage to the seat or the

safety belts. Always unbuckle the safety belts

and return them to their normal stowed position

before folding a rear seat.

2. Lift the lever(s), located on the bottom rear of the

second row seat(s) on the inboard side, to release

the seatback. The seatback will fold forward.

3. Lift the same lever again to release the rear of the

seat from the ﬂoor. The seat will tumble forward

automatically.

1-15

Automatic Release Fold and Tumble

Feature

The transmission must be in PARK (P) for this feature

to work.

Folding and Tumbling the Seat(s)

{CAUTION:

Automatically folding and tumbling the seat

when someone is sitting in the seat, could

cause injury to the person sitting there. Always

make sure there is no one sitting in the seat

before pressing the automatic seat release

button.

To fold and tumble the seat, do the following:

1. Make sure that there is nothing under, in front of, or

on the seat.

Notice: Folding a rear seat with the safety belts

still fastened may cause damage to the seat or the

safety belts. Always unbuckle the safety belts

and return them to their normal stowed position

before folding a rear seat.

2. From the front seats,

press one of the

automatic seat release

buttons located on

the overhead console.

When accessing the third row seats, if your vehicle

has them, from the outside of the vehicle, press

the button on the panel behind either rear door.

One press of the button automatically folds

the seatback ﬂat and tumbles the seat forward.

There will be a slight delay between the folding of

the seatback and the tumbling of the seat.

Overhead Console

Buttons shown, Panel

Button similar

1-16

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