ECU GMC YUKON XL 2007 Owner's Manual

6. To tighten the belt, push down on the child
restraint, pull the shoulder portion of the belt
to tighten the lap portion of the belt and
feed the shoulder belt back into the retractor.
If you are using a forward-facing child
restraint, you may nd it helpful to use your
knee to push down on the child restraint
as you tighten the belt. You should not be able
to pull more of the belt from the retractor
once the lock has been set.
7. Push and pull the child restraint in different
directions to be sure it is secure.8. If your vehicle has the passenger sensing
system and the airbag is off, the off indicator
in the instrument panel will be lit and stay
lit when the key is turned to RUN or START.
If a child restraint has been installed and the on
indicator is lit, turn the vehicle off. Remove
the child restraint from the vehicle and reinstall the
child restraint.
If after reinstalling the child restraint and restarting
the vehicle, the on indicator is still lit, check to
make sure that the vehicle’s seatback is not
pressing the child restraint into the seat cushion.
If this happens, slightly recline the vehicle’s
seatback and adjust the seat cushion if possible.
Also make sure the child restraint is not trapped
under the vehicle head restraint. If this happens,
adjust the head restraint.
If the on indicator is still lit, secure the child in the
child restraint in a rear seat position in the
vehicle and check with your dealer.
To remove the child restraint, just unbuckle the
vehicle’s safety belt and let it go back all the way.
The safety belt will move freely again and be
ready to work for an adult or larger child
passenger.
89

{CAUTION:
Anyone who is up against, or very close
to, any airbag when it inates can be
seriously injured or killed. Airbags plus
lap-shoulder belts offer the best
protection for adults, but not for young
children and infants. Neither the vehicle’s
safety belt system nor its airbag system is
designed for them. Young children and
infants need the protection that a child
restraint system can provide. Always
secure children properly in your vehicle.
To read how, seeOlder Children on
page 61orInfants and Young Children
on page 64.
Occupants should not lean on or sleep
against the door in the rst or second row
seats, or the rear windows in the third row
seat, if your vehicle has roof-mounted
rollover airbags.There is an airbag
readiness light on the
instrument panel cluster,
which shows the
airbag symbol.
The system checks the airbag electrical system for
malfunctions. The light tells you if there is an
electrical problem. SeeAirbag Readiness Light on
page 227for more information.
92

If your vehicle has a roof-mounted rollover airbag
and a third row passenger seat, the airbag is
located in the ceiling above the rear windows for
the outside passenger positions in the third row.
{CAUTION:
If something is between an occupant and
an airbag, the bag might not inate
properly or it might force the object into
that person causing severe injury or even
death. The path of an inating airbag must
be kept clear. Do not put anything
between an occupant and an airbag, and
do not attach or put anything on the
steering wheel hub or on or near any
other airbag covering. And, if your vehicle
has roof-mounted rollover airbags, never
secure anything to the roof of your
vehicle by routing the rope or tiedown
through any door or window opening.
If you do, the path of an inating side
impact airbag will be blocked. The path of
an inating airbag must be kept clear.
95

The passenger sensing system works with sensors
that are part of the right front passenger’s seat and
safety belt. The sensors are designed to detect the
presence of a properly-seated occupant and
determine if the passenger’s airbag should be
enabled (may inate) or not.
Accident statistics show that children are safer if
they are restrained in the rear rather than the front
seat. General Motors recommends that child
restraints be secured in a rear seat, including an
infant riding in a rear-facing infant seat, a child
riding in a forward-facing child seat and an older
child riding in a booster seat.
Your vehicle has a rear seat that will accommodate
a rear-facing child restraint. A label on your sun
visor says, “Never put a rear-facing child seat
in the front.” This is because the risk to the
rear-facing child is so great, if the airbag deploys.
{CAUTION:
A child in a rear-facing child restraint can
be seriously injured or killed if the right
front passenger’s airbag inates. This is
because the back of the rear-facing child
restraint would be very close to the
inating airbag.
Even though the passenger sensing
system is designed to turn off the
passenger’s frontal airbag if the system
detects a rear-facing child restraint, no
system is fail-safe, and no one can
guarantee that an airbag will not deploy
under some unusual circumstance, even
though it is turned off. We recommend
that rear-facing child restraints be secured
in the rear seat, even if the airbag is off.
If you need to secure a forward-facing
child restraint in the right front seat,
always move the front passenger seat as
far back as it will go. It is better to secure
the child restraint in a rear seat.
101

The passenger sensing system is designed to turn
off the right front passenger’s airbag if:
the right front passenger seat is unoccupied
the system determines that an infant is present
in a rear-facing infant seat
the system determines that a small child is
present in a forward-facing child restraint
the system determines that a small child is
present in a booster seat
a right front passenger takes his/her weight off
of the seat for a period of time
the right front passenger seat is occupied by a
smaller person, such as a child who has
outgrown child restraints
or if there is a critical problem with the airbag
system or the passenger sensing system.
When the passenger sensing system has turned
off the passenger’s airbag, the off indicator will light
and stay lit to remind you that the airbag is off.
If a child restraint has been installed and the on
indicator is lit, turn the vehicle off. Remove the child
restraint from the vehicle and reinstall the child
restraint following the child restraint manufacturer’s
directions and refer toSecuring a Child Restraint in
the Right Front Seat Position on page 86.If after reinstalling the child restraint and restarting
the vehicle, the on indicator is still lit, check to make
sure that the vehicle’s seatback is not pressing the
child restraint into the seat cushion. If this happens,
slightly recline the vehicle’s seatback and adjust the
seat cushion if possible. Also make sure the child
restraint is not trapped under the vehicle head
restraint. If this happens, adjust the head restraint.
If the on indicator is still lit, secure the child in the
child restraint in a rear seat position in the
vehicle and check with your dealer.
The passenger sensing system is designed to
enable (may inate) the right front passenger’s
airbag anytime the system senses that a person
of adult size is sitting properly in the right front
passenger’s seat. When the passenger sensing
system has allowed the airbag to be enabled, the
on indicator will light and stay lit to remind you
that the airbag is active.
For some children who have outgrown child
restraints and for very small adults, the passenger
sensing system may or may not turn off the right
front passenger’s airbag, depending upon the
person’s seating posture and body build. Everyone
in your vehicle who has outgrown child restraints
should wear a safety belt properly — whether or not
there is an airbag for that person.
102

Adding Equipment to Your
Airbag-Equipped Vehicle
Q:Is there anything I might add to the front
or sides of the vehicle that could keep the
airbags from working properly?
A:Yes. If you add things that change your
vehicle’s frame, bumper system, front end or
side sheet metal or height, they may keep the
airbag system from working properly. Also, the
airbag system may not work properly if you
relocate any of the airbag sensors. If you have
any questions about this, you should contact
Customer Assistance before you modify your
vehicle. The phone numbers and addresses for
Customer Assistance are in Step Two of the
Customer Satisfaction Procedure in this
manual. SeeCustomer Satisfaction Procedure
on page 572.
Q:Because I have a disability, I have to get
my vehicle modied. How can I nd out
whether this will affect my airbag system?
A:Changing or moving any parts of the front
seats, safety belts, the airbag sensing and
diagnostic module (located under the driver’s
seat), rollover sensor module (located under
the center console), instrument panel, steering
wheel, ceiling headliner, ceiling and pillar
garnish trim, roof-mounted rollover airbag
modules or airbag wiring can affect the
operation of the airbag system. If you have
questions, call Customer Assistance. The
phone numbers and addresses for Customer
Assistance are in Step Two of the Customer
Satisfaction Procedure in this manual. See
Customer Satisfaction Procedure on page 572.
105

Keys.............................................................111
Remote Keyless Entry System.....................112
Remote Keyless Entry System Operation......113
Doors and Locks.........................................120
Door Locks................................................120
Power Door Locks......................................121
Delayed Locking.........................................121
Programmable Automatic Door Locks.........121
Rear Door Security Locks..........................122
Lockout Protection......................................122
Liftgate/Liftglass..........................................123
Power Liftgate............................................125
Power Running Boards...............................129
Windows......................................................130
Power Windows.........................................131
Sun Visors.................................................132
Theft-Deterrent Systems..............................132
Content Theft-Deterrent..............................132
PASS-Key
®III+..........................................134
PASS-Key®III+ Operation..........................134
Starting and Operating Your Vehicle..........136
New Vehicle Break-In.................................136
Ignition Positions........................................137Retained Accessory Power (RAP)..............138
Starting the Engine.....................................138
Adjustable Throttle and Brake Pedal...........140
Engine Coolant Heater...............................140
Displacement on Demand™ (DoD™)..........141
Automatic Transmission Operation..............142
Tow/Haul Mode..........................................145
Four-Wheel Drive.......................................146
Parking Brake............................................151
Shifting Into Park (P)..................................152
Shifting Out of Park (P)..............................154
Parking Over Things That Burn..................154
Engine Exhaust..........................................155
Running the Engine While Parked..............156
Mirrors..........................................................157
Automatic Dimming Rearview Mirror with
OnStar
®, Compass and Temperature
Display....................................................157
Automatic Dimming Rearview Mirror with
Compass and Temperature Display.........160
Outside Manual Mirrors..............................163
Outside Trailer-Tow Mirrors........................163
Outside Power Mirrors................................164
Section 2 Features and Controls
109

Rear Door Security Locks
Your vehicle has rear door security locks. These
prevent passengers from opening the rear
doors from the inside.
The rear door security
locks are located on the
inside edge of each
rear door. You
must open the rear
doors to access them.
The label depicting
lock and unlock
positions is located near
the lock.
To set the locks, do the following:
1. Insert the key into the security lock slot and
turn it so the slot is in the horizontal position.
2. Close the door.When you want to open a rear door when the
security lock is on, do the following:
1. Unlock the door using the remote keyless
entry transmitter, if the vehicle has one, the
power door lock switch, or by lifting the
rear door manual lock.
2. Open the door from the outside.
To cancel the rear door security lock, do the
following:
1. Unlock the door and open it from the outside.
2. Insert the key into the security lock slot
and turn it so the slot is in the vertical position.
Lockout Protection
This feature protects you from locking the key in
the vehicle when the key is in the ignition and
a front door is open.
If the driver’s side power door lock switch is
pressed when the driver’s door is open and the
key is in the ignition, all of the doors will lock and
then the driver’s door will unlock.Security Lock Label
shown
122

Sun Visors
Pull the sun visor down to block glare. Detach the
sun visor from the center mount and slide it
along the rod from side-to-side to cover the driver
or passenger side of the front window. Swing
the sun visor to the side to cover the side window.
It can be moved along the rod from side-to-side
in this position also.
Lighted Visor Vanity Mirror
Your vehicle may have lighted visor vanity mirrors
on both the driver’s and passenger’s sun visors.
Pull the sun visor down and lift the mirror cover to
turn the lamps on.
Theft-Deterrent Systems
Vehicle theft is big business, especially in some
cities. Although your vehicle has a number of
theft-deterrent features, we know that nothing we
put on it can make it impossible to steal.
Content Theft-Deterrent
Your vehicle may have a content theft-deterrent
alarm system.
To activate the theft-deterrent system, do the
following:
1. Open the door.
2. Lock the door with the Remote Keyless Entry
(RKE) transmitter. The security light should
come on and ash. The door does not need to
be open.
If the delayed locking feature is active, the
alarm will not be activated until all doors are
closed and the security light goes off.
3. Close all doors. The security light will stop
ashing and go off after approximately
30 seconds. The content theft deterrent alarm
is not armed until the security light goes off.
132

If a door is opened without using the RKE
transmitter, a ten second pre-alarm will occur.
The horn will chirp and the lights will ash. If the
key is not placed in the ignition and turned to
START or the door is not unlocked by pressing the
unlock button on the RKE transmitter during the
ten second pre-alarm, the alarm will go off.
Your vehicle’s headlamps will ash and the horn
will sound for about two minutes, then will turn
off to save the battery power.
The theft-deterrent system will not activate if you
lock the doors with a key, the manual door lock, or
the power door lock switch. It activates only if you
use the RKE transmitter. You should also
remember that you can start your vehicle with the
correct ignition key if the alarm has been set off.
Here is how to avoid setting off the alarm by
accident:
If you do not want to activate the
theft-deterrent system, the vehicle should be
locked with the door key after the doors
are closed.
Always unlock a door with the RKE transmitter.
Unlocking a door any other way will set off the
alarm if the system has been armed.If you set off the alarm by accident, turn off the
alarm by pressing unlock on the RKE transmitter or
by placing the key in the ignition and turning it
to START.
Testing the Alarm
The alarm can be tested by following these steps:
1. From inside the vehicle, lower the driver’s
window and open the driver’s door.
2. Activate the system by locking the doors with
the RKE transmitter.
3. Get out of the vehicle, close the door and wait
for the security light to go out.
4. Then reach in through the window, unlock the
door with the manual door lock and open the
door. This should set off the alarm.
If the alarm does not sound when it should, but
the vehicle’s headlamps ash, check to see if the
horn works. The horn fuse may be blown. To
replace the fuse, seeFuses and Circuit Breakers
on page 540.
If the alarm does not sound or the vehicle’s
headlamps do not ash, see your dealer for
service.
133