2003 GMC SONOMA ECU

Front Seats......................................................1-3
Manual Seats................................................1-3
Power Seats..................................................1-4
Manual Lumbar..............................................1-4
Power Lumbar ...............................................1-5
Heated Seats.................................................1-5
Reclining Seatbacks........................................1-6
Head Restraints.............................................1-7
Seatback Latches...........................................1-8
Rear Seats.......................................................1-9
Rear Seat Operation.......................................1-9
Jump Seat...................................................1-10
Safety Belts...................................................1-10
Safety Belts: They Are for Everyone................1-10
Questions and Answers About Safety Belts......1-15
How to Wear Safety Belts Properly.................1-15
Driver Position..............................................1-16
Safety Belt Use During Pregnancy..................1-22
Right Front Passenger Position.......................1-23
Center Passenger Position.............................1-23
Rear Seat Passengers (Extended Cab
Jump Seat)..............................................1-25
Rear Seat Passengers (Crew Cab
®) ................1-26
Safety Belt Extender.....................................1-29Child Restraints.............................................1-30
Older Children..............................................1-30
Infants and Young Children............................1-32
Child Restraint Systems.................................1-36
Where to Put the Restraint (Regular Cab
and Extended Cab Pickup).........................1-39
Where to Put the Restraint
(Crew Cab
®Pickup)...................................1-40
Top Strap....................................................1-41
Top Strap Anchor Location.............................1-43
Lower Anchorages and Top Tethers for
Children (LATCH System)...........................1-44
Securing a Child Restraint Designed for
the LATCH System....................................1-46
Securing a Child Restraint in a Rear
Outside Seat Position................................1-46
Securing a Child Restraint in a Center
Seat Position............................................1-49
Securing a Child Restraint in the Right
Front Seat Position....................................1-49
Air Bag System..............................................1-54
Where Are the Air Bags?
...............................1-56
When Should an Air Bag Inate?
....................1-57
What Makes an Air Bag Inate?
.....................1-58
Section 1 Seats and Restraint Systems
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2003 - Sonoma OM

Driver Position
This part describes the driver’s restraint system.
Lap-Shoulder Belt
The driver has a lap-shoulder belt. Here’s how to wear
it properly.
1. Close and lock the door.
2. Adjust the seat so you can sit up straight. To see
how, see“Seats”in the Index.3. Pick up the latch plate and pull the belt across you.
Don’t let it get twisted.
The shoulder belt may lock if you pull the belt
across you very quickly. If this happens, let the belt
go back slightly to unlock it. Then pull the belt
across you more slowly.
4. Push the latch plate into the buckle until it clicks.
Pull up on the latch plate to make sure it is secure.
If the belt isn’t long enough, seeSafety Belt
Extender on page 1-29.
Make sure the release button on the buckle is
positioned so you would be able to unbuckle the
safety belt quickly if you ever had to.
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2003 - Sonoma OM

1. Pick up the latch plate and pull the belt across you.
Don’t let it get twisted.
The shoulder belt may lock if you pull the belt
across you very quickly. If this happens, let the belt
go back slightly to unlock it. Then pull the belt
across you more slowly.
2. Push the latch plate into the buckle until it clicks.
Pull up on the latch plate to make sure it is secure.
When the shoulder belt is pulled out all the way,
it will lock. If it does, let it go back all the way and
start again.If the belt is not long enough, seeSafety Belt
Extender on page 1-29.
Make sure the release button on the buckle is
positioned so you would be able to unbuckle the
safety belt quickly if you ever had to.
3. To make the lap part tight, pull down on the buckle
end of the belt as you pull up on the shoulder part.
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2003 - Sonoma OM

Every time infants and young children ride in vehicles,
they should have the protection provided by appropriate
restraints. Young children should not use the vehicle’s
adult safety belts alone, unless there is no other choice.
Instead, they need to use a child restraint.
{CAUTION:
People should never hold a baby in their arms
while riding in a vehicle. A baby doesn’t weigh
much -- until a crash. During a crash a baby
will become so heavy it is not possible to
hold it. For example, in a crash at only
25 mph (40 km/h), a 12-lb. (5.5 kg) baby will
suddenly become a 240-lb. (110 kg) force on a
person’s arms. A baby should be secured in
an appropriate restraint.
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2003 - Sonoma OM

For most basic types of child restraints, there are
many different models available. When purchasing a
child restraint, be sure it is designed to be used
in a motor vehicle. If it is, the restraint will have a
label saying that it meets federal motor vehicle
safety standards.
The restraint manufacturer’s instructions that come
with the restraint state the weight and height
limitations for a particular child restraint. In addition,
there are many kinds of restraints available for
children with special needs.
{CAUTION:
Newborn infants need complete support,
including support for the head and neck. This is
necessary because a newborn infant’s neck is
weak and its head weighs so much compared
with the rest of its body. In a crash, an infant in a
rear-facing seat settles into the restraint, so the
crash forces can be distributed across the
strongest part of an infant’s body, the back and
shoulders. Infants always should be secured in
appropriate infant restraints.
{CAUTION:
The body structure of a young child is quite
unlike that of an adult or older child, for whom
the safety belts are designed. A young child’s
hip bones are still so small that the vehicle’s
regular safety belt may not remain lowon the
hip bones, as it should. Instead, it may settle
up around the child’s abdomen. In a crash, the
belt would apply force on a body area that’s
unprotected by any bony structure. This alone
could cause serious or fatal injuries. Young
children always should be secured in
appropriate child restraints.
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2003 - Sonoma OM

Q:Howdo child restraints work?
A:A child restraint system is any device designed for
use in a motor vehicle to restrain, seat, or position
children. A built-in child restraint system is a
permanent part of the motor vehicle. An add-on
child restraint system is a portable one, which
is purchased by the vehicle’s owner.
For many years, add-on child restraints have used
the adult belt system in the vehicle. To help
reduce the chance of injury, the child also has to be
secured within the restraint. The vehicle’s belt
system secures the add-on child restraint in the
vehicle, and the add-on child restraint’s harness
system holds the child in place within the restraint.
One system, the three-point harness, has straps that
come down over each of the infant’s shoulders and
buckle together at the crotch. Thefive-point harness
system has two shoulder straps, two hip straps and a
crotch strap. A shield may take the place of hip
straps. A T-shaped shield has shoulder straps thatare attached to aflat pad which rests low against the
child’s body. A shelf- or armrest-type shield has
straps that are attached to a wide, shelf-like shield
that swings up or to the side.
When choosing a child restraint, be sure the child
restraint is designed to be used in a vehicle. If it is, it
will have a label saying that it meets federal motor
vehicle safety standards.
Then follow the instructions for the restraint. You may
find these instructions on the restraint itself or in a
booklet, or both. These restraints use the belt system in
your vehicle, but the child also has to be secured
within the restraint to help reduce the chance of personal
injury. When securing an add-on child restraint, refer
to the instructions that come with the restraint which may
be on the restraint itself or in a booklet, or both, and
to this manual. The child restraint instructions are
important, so if they are not available, obtain a
replacement copy from the manufacturer.
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2003 - Sonoma OM

Where to Put the Restraint (Regular
Cab and Extended Cab Pickup)
The child restraint must be secured properly in the right
front passenger seat. If you want to secure a
rear-facing child restraint in the right front passenger’s
seat, turn off the passenger’s air bag. SeeAir Bag
Off Switch on page 1-60andSecuring a Child Restraint
in the Right Front Seat Position on page 1-49for
more on this, including important safety information.
{CAUTION:
A child in a rear-facing child 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 to turn off the air bag before using a
rear-facing child restraint in the right front
seat position.
Even though the AIR BAG OFF switch is
designed to turn off the passenger’s frontal air
bag, no system is fail-safe, and no one can
guarantee that an air bag will not deploy under
some unusual circumstance, even though it is
turned off. General Motors therefore
recommends that rear-facing child restraints
be transported in vehicles with a rear seat that
will accommodate a rear-facing child restraint,
whenever possible.
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2003 - Sonoma OM

Where to Put the Restraint
(CrewCab
®Pickup)
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 outside position,
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.Neverput a rear-facing
child restraint in the right front
passenger’s seat.Here’s why:{CAUTION:
A child in a rear-facing child 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.
Always secure a rear-facing child restraint in
a rear seat.
You may secure a forward-facing child
restraint in the right front seat, but before you
do, always move the front passenger seat as
far back as it will go. It’s better to secure the
child restraint in a rear seat.
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2003 - Sonoma OM