2008 GMC ENVOY DENALI high

Power Lumbar
On vehicles with power
lumbar, the control is
located on the outboard
side of the seat.
To increase or decrease support, hold the control
forward or rearward.
Heated Seats
Your vehicle may have
heated front seats. The
buttons used to control this
feature are located on the
front door armrests. The
engine must be running
for the heated seat feature
to work.
To heat the entire seat, press the horizontal button with
the heated seat and seatback symbol. Press the button to
cycle through the temperature settings of high, medium,
and low and to turn the heated seat off. The indicator
lights above the button will come on to designate the
level of heat selected: three for high, two for medium,
and one for low. The low setting warms the seatback
and seat cushion until the seat temperature is near
body temperature. The medium and high settings heat
the seatback and seat cushion to a slightly higher
temperature. You will be able to feel heat in about
two minutes.
1-4

How to Wear Safety Belts Properly
This section is only for people of adult size.
Be aware that there are special things to know about
safety belts and children. And there are different
rules for smaller children and babies. If a child will be
riding in your vehicle, seeOlder Children on page 1-32
orInfants and Young Children on page 1-35. Follow
those rules for everyone’s protection.
It is very important for all occupants to buckle up.
Statistics show that unbelted people are hurt more often
in crashes than those who are wearing safety belts.
Occupants who are not buckled up can be thrown out
of the vehicle in a crash. And they can strike others
in the vehicle who are wearing safety belts.
First, before you or your passenger(s) wear a safety
belt, there is important information you should know.
Sit up straight and always keep your feet on the oor in
front of you. The lap part of the belt should be worn low
and snug on the hips, just touching the thighs. In a crash,
this applies force to the strong pelvic bones and you
would be less likely to slide under the lap belt. If you slid
under it, the belt would apply force on your abdomen.
This could cause serious or even fatal injuries. The
shoulder belt should go over the shoulder and across
the chest. These parts of the body are best able to take
belt restraining forces.
The shoulder belt locks if there is a sudden stop or crash.
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Q:What is wrong with this?
A:The lap belt is too loose. It will not give nearly as
much protection this way.
{CAUTION:
You can be seriously hurt if your lap belt is too
loose. In a crash, you could slide under the lap
belt and apply force on your abdomen. This
could cause serious or even fatal injuries. The
lap belt should be worn low and snug on the
hips, just touching the thighs.
1-20

Q:What is wrong with this?
A:The belt is over an armrest.
{CAUTION:
You can be seriously injured if your belt goes
over an armrest like this. The belt would be
much too high. In a crash, you can slide under
the belt. The belt force would then be applied
on the abdomen, not on the pelvic bones, and
that could cause serious or fatal injuries.
Be sure the belt goes under the armrests.
1-22

Child Restraints
Older Children
Older children who have outgrown booster seats should
wear the vehicle’s safety belts.The manufacturer’s instructions that come with the
booster seat state the weight and height limitations for
that booster. Use a booster seat with a lap-shoulder belt
until the child passes the below t test:
Sit all the way back on the seat. Do the knees bend
at the seat edge? If yes, continue. If no, return to
the booster seat.
Buckle the lap-shoulder belt. Does the shoulder belt
rest on the shoulder? If yes, continue. If no, try
using the rear safety belt comfort guide. See “Rear
Safety Belt Comfort Guides” underLap-Shoulder
Belt on page 1-26for more information. If the
shoulder belt still does not rest on the shoulder,
then return to the booster seat.
Does the lap belt t low and snug on the hips,
touching the thighs? If yes, continue. If no, return
to the booster seat.
Can proper safety belt t be maintained for the
length of the trip? If yes, continue. If no, return
to the booster seat.
1-32

Q:What is the proper way to wear safety belts?
A:An older child should wear a lap-shoulder belt and
get the additional restraint a shoulder belt can
provide. The shoulder belt should not cross the face
or neck. The lap belt should t snugly below the hips,
just touching the top of the thighs. This applies belt
force to the child’s pelvic bones in a crash. It should
never be worn over the abdomen, which could cause
severe or even fatal internal injuries in a crash.
Also see “Rear Safety Belt Comfort Guides” under
Lap-Shoulder Belt on page 1-26.
According to accident statistics, children and infants
are safer when properly restrained in the rear seating
positions than in the front seating positions.
In a crash, children who are not buckled up can strike
other people who are buckled up, or can be thrown
out of the vehicle. Older children need to use safety
belts properly.{CAUTION:
Never do this.
Here two children are wearing the same belt.
The belt cannot properly spread the impact
forces. In a crash, the two children can be
crushed together and seriously injured. A belt
must be used by only one person at a time.
1-33

The key code number tells your dealer/retailer or a
qualied locksmith how to make extra keys. Keep this
number in a safe place. If you lose your keys, you will be
able to have new ones made easily using this number.
Your selling dealer/retailer should also have this
number.
Notice:If you ever lock your keys in your vehicle,
you may have to damage the vehicle to get in.
Be sure you have spare keys.
If you ever get locked out of your vehicle, call the
Roadside Assistance Center. SeeRoadside Assistance
Program on page 7-8.
Remote Keyless Entry (RKE)
System
Your Remote Keyless Entry (RKE) system operates on
a radio frequency subject to Federal Communications
Commission (FCC) Rules and with Industry Canada.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
1. This device may not cause interference.
2. This device must accept any interference received,
including interference that may cause undesired
operation of the device.This device complies with RSS-210 of Industry Canada.
Operation is subject to the following two conditions:
1. This device may not cause interference.
2. This device must accept any interference received,
including interference that may cause undesired
operation of the device.
Changes or modications to this system by other than
an authorized service facility could void authorization to
use this equipment.
At times you may notice a decrease in operating range.
This is normal for any RKE system. If the transmitter
does not work or if you have to stand closer to
your vehicle for the transmitter to work, try this:
Check the distance. You may be too far from your
vehicle. You may need to stand closer during
rainy or snowy weather.
Check the location. Other vehicles or objects may
be blocking the signal. Take a few steps to the
left or right, hold the transmitter higher, and
try again.
Check to determine if battery replacement is
necessary. See “Battery Replacement” later in
this section.
If you are still having trouble, see your dealer/retailer
or a qualied technician for service.
2-4

Liftgate/Liftglass
{CAUTION:
It can be dangerous to drive with the liftgate or
liftglass open because carbon monoxide (CO)
gas can come into your vehicle. You cannot see
or smell CO. It can cause unconsciousness and
even death. If you must drive with the liftgate
open or if electrical wiring or other cable
connections must pass through the seal
between the body and the liftgate or liftglass:
Make sure all other windows are shut.
Turn the fan on your climate control system
to its highest speed and select the control
setting that will force outside air into your
vehicle. See “Climate Control System” in
the Index.
If you have air outlets on or under the
instrument panel, open them all the way.
SeeEngine Exhaust on page 2-37.
Liftgate Release
To unlock the liftgate, use the power door lock switch
or the remote keyless entry transmitter. SeeRemote
Keyless Entry (RKE) System Operation on page 2-5.
The liftglass will also unlock when the liftgate is
unlocked.
Press the button on the liftglass to open it. To open the
entire liftgate, lift the handle located in the center of
the liftgate. When the liftgate is opened, the liftglass
will lock after a short delay.
Emergency Release for Opening
Liftgate
1. Remove the trim plug, located on the inside of the
liftgate in the center, to expose the access hole in
the trim panel.
2. Use a tool to reach through the access hole in the
trim panel.
3. Pry the left release lever up to the unlock position.
Pry the right release lever up to unlatch the liftgate.
4. Reinstall the trim plug.
2-12