ECU GMC YUKON DENALI 2003 Owner's Manual

6. To tighten the belt, feed the shoulder belt back into
the retractor while you push down on the child
restraint. If you are using a forward-facing child
restraint, you may find 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
out of 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 you’re using a rear-facing child restraint in this
seat, check to be sure the right front passenger’s
frontal air bag is off before you begin to drive.
If the
air bag has been turned off the
off indicator will
light and stay lit when the key is turned to RUN or
START.
If the on indicator is lit, the passenger’s frontal air
bag has not been turned
off. If this ever happens,
turn off the vehicle, unbuckle the safety belt
and perform the steps to install the rear-facing
restraint again. After restarting the vehicle,
if the air
bag still doesn’t turn off, install the infant restraint
in
a rear seat position of the vehicle and have your
vehicle serviced as soon as possible.
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.
1-71

An,,ne who is up against, or very close to,
any air bag when
it inflates can be seriously
injured or killed. Air bags 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 air bag 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,
see the part of this manual called “Older
Children” or
“Infants and Young Children”.
There is a air bag readiness light on the
instrument panel cluster,
which shows the air
bag symbol. The
system checks the air bag electrical system for
malfunctions. The light tells you
if there is an electrical
problem. See
Air Bag Readiness Light on page 3-31
for more information.
Where Are the Air Bags?
The driver’s frontal air bag is in the middle of the
steering wheel.
1-74

Passenger Sensing System
If your rearview mirror has one of the indicators pictured
in the following illustrations, your vehicle has a passenger
sensing system. The indicator will be visible when you
turn your ignition key
to START or RUN. The words ON
and OFF or the symbol for on and off, will be visible on
the rearview mirror during the system check. When the
system check
is complete, either the word ON or the word
OFF, or the symbol for on or the symbol for off will be
visible. See Passenger
Air Bag Status Indicator on
page 3-32. If your rearview mirror doesn’t have either of
the indicators pictured, then your vehicle doesn’t have the
passenger sensing system.
L
Passenger Air Bag Status Indicator - United States Passenger
Air Bag
Status Indicator
- Canada
The passenger sensing system will turn off the right
front passenger’s frontal air bag under certain
conditions. The driver’s air bag and the side air bags
are not part
of the passenger sensing system.
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 frontal air bag should be enabled
(may inflate) or not.
Accident statistics show that children are safer
if they
are restrained in the rear rather than the front seat.
General Motors, therefore, 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. Never put a child in rear facing child
1-81

restraint in the right front passenger seat unless your
vehicle has the passenger sensing system and the
passenger air bag status indicator shows
off. Never put
a rear facing child restrain in the right front passenger
seat
I Inless the air bag is off.
1
A l-..jld in a rear-facing -..ild restraint can be
seriously injured or killed
if the right front
passenger’s air bag inflates. This is because
the back of the rear facing child restraint
would be very close to the inflating air bag. Be
sure the air bag is
off before using a
rear-facing child restraint in the right front seat
position.
Even though the passenger sensing system
is
designed to turn off the passenger’s frontal air
bag if the system detects a rear-facing child
restraint, no system is fail-safe, and no one
can guarantee that an air bag will not deploy
under some unusual circumstance,
CAUTION: (Continued) even though
it is
turned off. General Motors
therefore recommends that rear-facing child restraints be secured in the rear seat whenever
possible, even if the air bag is
off.
The passenger sensing system is designed to turn off
the right front passenger’s frontal air bag 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 hidher weight off of
the right front passenger seat is occupied by a
the seat for a period of time.
smaller person, such as a child who has outgrown
child restraints.
0 or if there is a critical problem with the air bag
system or the passenger sensing system.
1-82

When the passenger sensing system has turned off the
passenger’s frontal air bag, the
off indicator will light
and stay lit to remind you that the air bag is
off.
The passenger sensing system is designed to turn off
the passenger’s frontal air bag when a rear facing infant
seat, a forward-facing child restraint or a booster seat
is detected. If the 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
restraint following the child restraint manufacturer’s
directions and refer to Securing
a Child Restraint in the
Right Front Seat Position
on page 7-68 of this manual.
If after reinstalling the child restraint and restarting
the vehicle, 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 inflate) the right front passenger’s frontal air
bag 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
air bag to be enabled, the on indicator will light and stay
lit to remind you that the air bag 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
frontal air bag, 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 air bag
for that person.
If a person of adult-size is sitting in the right front
passenger’s seat, but the
off indicator is lit, it could be
because that person isn’t sitting properly in the seat. If
this happens, turn the vehicle
off and ask the person to
place the seatback in the full upright position, then sit
upright in the seat, centered on the seat cushion, with the
person’s legs comfortably extended. Restart the vehicle
and have the person remain in this position for about two
minutes. This will allow the system to detect that person
and then enable the passenger’s air bag.
1-83

Section 2 Features and Controls
Keys ............................................................... 2.3
Remote Keyless Entry System
......................... 2.4
Remote Keyless Entry System Operation
........... 2.5
Doors and Locks ............................................. 2.8
Door Locks
................................................. 2.8
Power Door Locks
.......... .... ............. 2.9
Delayed Locking
............................................. 2.9
Programmable Automatic
Door Locks
............................................... 2.10
Rear Door Security Locks
.............................. 2.12
Lockout Protection
........................................ 2.13
LiftgateILiftglass
..................................... 2.13
Windows ........................................................ 2.14
Power Windows
............................................ 2.15
Sun Visors
................................................... 2.15
Theft-Deterrent Systems .................................. 2.16
Content Theft-Deterrent
................................. 2.16
Passlock@
.................................................... 2.17
Starting and Operating Your Vehicle ................ 2.18
New Vehicle Break-In
.................................... 2-18
Starting Your Engine
..................................... 2.19
Engine Coolant Heater
.................................. 2.21
Automatic Transmission Operation
................... 2.22
Shifting Into Park (P)
................. , ........ 2.26
Shifting Out of Park (P)
..................... , ........ 2-28
Parking Over Things That Burn
....................... 2-29
Engine Exhaust
............................................ 2.29
Running Your Engine While You Are Parked
.... 2-30
Ignition Positions
.......................................... 2.18
Adjustable Throttle and Brake Pedal
............... -2-20
Parking Brake
.............................. ..... 2.25
2-
1

Rear Door Security Locks
With this feature, you can lock the rear doors so they
can’t be opened from the inside by passengers.
This feature is located
on the inside edge of the
rear doors.
To use one of the locks, do the following:
1. Open one of the rear doors.
2. Move the lever forward to engage the rear door
security lock.
3. Close the door.
4. Do the same thing to the other rear door.
The rear doors or your vehicle cannot be opened from the
inside when this feature is in use. If you want
to open the
rear door while the security lock is engaged, unlock the
door and open the door from the outside. Move the lever
rearward
to disengage the child security lock feature.
2-1 2

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 is equipped with a content theft-deterrent
alarm system.
With this system, the
security light in the instrument panel cluster
will flash as you open
the door
if your ignition
is
off.
This light reminds you to activate the theft-deterrent
system. Here’s how
to do it:
1. Open the door.
2. Lock the door with the power door lock switch or
the remote keyless entry transmitter. The security
light should come
on and stay on.
3. Close all doors. The security light should go off
after about 30 seconds. The alarm is not armed
until the security light goes
off.
If a locked door is opened without the key or the remote
keyless entry transmitter, the alarm will
go off. The
headlamps and parking lamps will flash for
two minutes,
and the horn will sound for
30 seconds, then will turn
off to save the battery power. You can choose different
feedback options for the alarm. See Driver lnformation
Center
(DIC) on page 3-43.
Remember, the theft-deterrent system won’t activate if
you lock the doors with a key or use the manual
door lock.
It activates only if you use a power door lock
switch with the door open, or with the remote keyless
entry transmitter. You should also remember that
you can start your vehicle with the correct ignition key
if
the alarm has been set off.
Here’s how to avoid setting off the alarm by accident:
If you don’t 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 a key, or use the remote
keyless entry transmitter. Unlocking a door any
other way will set
off the alarm.
If you set
off the alarm by accident, unlock any door with
the key. You can also turn
off the alarm by pressing
unlock on the remote keyless entry transmitter. The alarm
won’t stop
if you try to unlock a door any other way.
2-1 6

Testing the Alarm Passlock@’
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
power door lock switch while the door is open, or
with the remote keyless entry 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.
While the alarm is set, the power door unlock switch is
not operational.
If the alarm does not sound when it should but the
headlamps flash, check
to see if the horn works. The
horn fuse may be blown. To replace the fuse, see Fuses
and Circuit Breakers on page
5-87.
If the alarm does not sound or the headlamps do not
flash, the vehicle should be serviced by your dealer. Your
vehicle is equipped with the Passlock@
theft-deterrent system.
Passlock@ is a passive theft-deterrent system. Passlock@
enables fuel
if the ignition lock cylinder is turned with
a valid key. If a correct key is not used or the ignition
lock cylinder is tampered with, the fuel system is
disabled and the vehicle will not start.
During normal operation, the security light will turn
off
approximately five seconds after the key is turned
to RUN.
If the engine stalls and the security light flashes, wait
about
10 minutes until the light stops flashing before
trying
to restart the engine. Remember to release
the key from START as soon as the engine starts.
If the engine does not start after three tries, the vehicle
needs service.
If the engine is running and the security light comes on,
you will be able to restart the engine
if you turn the engine
off. However, your Passlock@system is not working
properly and must be serviced by your dealer. Your
vehicle is not protected by Passlock@at this time. You
may also want
to check the fuse. See Fuses and Circuit
Breakers
on page 5-87. See your dealer for service.
In an emergency, call the Roadside Assistance Center.
See Roadside Assistance Program
on page 7-5.
3-1 7

Onstar@ System Onstar@ Services
Onstar@ provides a number of service plans to closely
meet your needs. Some of the services currently
provided by Onstar@ are:
I Automatic Notification of Air Bag Deployment
Onstar@ uses global positioning system (GPS) satellite
technology, wireless communications, and state of
the art call centers
to provide you with a wide range of
safety, security, information and convenience services.
An Onstar@ subscription plan is included in the price
of your vehicle. You can easily upgrade
or extend your
Onstar@ services
to meet your personal needs.
A complete Onstar@ user’s guide and the terms and
conditions
of the Onstar@ Subscription Service
Agreement are included in your Onstar@-equipped
vehicle’s glove box literature. For more information, visit
www.onstar.com, contact Onstar@ at
1 -888-4-ONSTAR
(1 -888-466-7827), or press the blue Onstar@ button
to speak to an Onstar@ advisor 24 hours a day, 7 days
a week.
Emergency Services
Roadside Assistance Stolen Vehicle Tracking
AccidentAssist
Remote Door Unlock
Remote Diagnostics
Onstar@ MED-NET (Requires separate activation
Online and Personal Concierge Services
and annual fee
on some plans)
Route Support
RideAssist
Information and Convenience Services
2-36