2010 GMC SIERRA Owner's Manual

If the belt stops before it reaches the buckle, when
using the lap-shoulder belt in a rear center seating
position of a crew-cab, tilt the latch plate and keep
pulling the safety belt until it can be buckled.3. 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 is not long enough, see Safety Belt
Extender
on page 2‑38.
If the latch plate will not go fully into the buckle,
check if the correct buckle is being used.
Position the release button on the buckle so that
the safety belt could be quickly unbuckled if
necessary.
2-31

4. If equipped with a shoulder belt height adjuster,move it to the height that is right for you.
See “Shoulder Belt Height Adjustment” later in
this section.
5. To make the lap part tight, pull up on the shoulder belt.
It may be necessary to pull stitching on the safety
belt through the latch plate to fully tighten the lap
belt on smaller occupants.
To unlatch the belt, push the button on the buckle.
The belt should return to its stowed position.
Before a door is closed, be sure the safety belt is out
of the way. If a door is slammed against a safety belt,
damage can occur to both the safety belt and the
vehicle.
2-32

Shoulder Belt Height Adjuster
The vehicle has a shoulder belt height adjuster for the
driver and right front passenger.
Adjust the height so that the shoulder portion of the belt
is centered on the shoulder. The belt should be away
from the face and neck, but not falling off the shoulder.
Improper shoulder belt height adjustment could reduce
the effectiveness of the safety belt in a crash.
Regular and Crew CabTo move the adjuster
down for the regular and
crew cabs, squeeze the
buttons (A) on the sides of
the height adjuster and
move the height adjuster
to the desired position.
Extended CabOn the extended cab,
push down on the release
button (A) and move the
height adjuster to the
desired position.
You can move the adjuster up just by pushing up on the
shoulder belt guide.
After you move the adjuster to where you want it, try to
move it down, without squeezing the buttons for the
regular and crew cabs, or without pushing the release
button for extended cabs, to make sure it has locked
into position.
2-33

Safety Belt Pretensioners
This vehicle has safety belt pretensioners for front
outboard occupants. Although the safety belt
pretensioners cannot be seen, they are part of the
safety belt assembly. They can help tighten the safety
belts during the early stages of a moderate to severe
frontal, near frontal, or rear crash if the threshold
conditions for pretensioner activation are met. And,
if your vehicle has side impact airbags, safety belt
pretensioners can help tighten the safety belts in a side
crash or a rollover event.
Pretensioners work only once. If the pretensioners
activate in a crash, they will need to be replaced, and
probably other new parts for the vehicle's safety belt
system. SeeReplacing Restraint System Parts After a
Crash on page 2‑94.
Rear Safety Belt Comfort Guides
This vehicle may have rear shoulder belt comfort
guides. If not, they are available through your
dealer/retailer. The guides may provide added safety
belt comfort for older children who have outgrown
booster seats and for some adults. When installed and
properly adjusted, the comfort guide positions the belt
away from the neck and head.
2-34

Here is how to install a comfort guide to the
shoulder belt:1. Remove the guide from its storage clip on the interior body.
2. Place the guide over the belt and insert thetwo edges of the belt into the slots of the guide.
3. Be sure that the belt is not twisted and it lies flat.The elastic cord must be under the belt and the
guide on top.
2-35

{WARNING:
A safety belt that is not properly worn may not
provide the protection needed in a crash.
The person wearing the belt could be seriously
injured. 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.
4. Buckle, position, and release the safety belt asdescribed previously in this section. Make sure that
the shoulder belt crosses the shoulder.
To remove and store the comfort guide, squeeze the
belt edges together so that the safety belt can be
removed from the guide. Slide the guide onto the
storage clip.
2-36

Safety Belt Use During Pregnancy
Safety belts work for everyone, including pregnant
women. Like all occupants, they are more likely to be
seriously injured if they do not wear safety belts.
A pregnant woman should wear a lap-shoulder belt, and
the lap portion should be worn as low as possible,
below the rounding, throughout the pregnancy.
The best way to protect the fetus is to protect the
mother. When a safety belt is worn properly, it is more
likely that the fetus will not be hurt in a crash. For
pregnant women, as for anyone, the key to making
safety belts effective is wearing them properly.
Lap Belt (Crew and Extended Cab)
This section is only for the lap belt. To learn how to
wear a lap-shoulder belt, seeLap-Shoulder Belton
page 2‑30.
Your vehicle may have a center seating position.
When you sit in the center front seating position,
you have a lap safety belt, which has no retractor.
To make the belt longer, tilt the latch plate and pull it
along the belt.
Buckle, position, and release it the same way as the
lap part of a lap-shoulder belt.
2-37

To make the belt shorter, pull its free end as shown until
the belt is snug.
If the belt is not long enough, seeSafety Belt Extender
on page 2‑38.
Make sure the release button on the buckle is
positioned so you would be able to unbuckle the safety
belt quickly if necessary.
Safety Belt Extender
If the vehicle's safety belt will fasten around you,
you should use it.
But if a safety belt is not long enough, your dealer/
retailer will order you an extender. When you go in to
order it, take the heaviest coat you will wear, so the
extender will be long enough for you. To help avoid
personal injury, do not let someone else use it, and use
it only for the seat it is made to fit. The extender has
been designed for adults. Never use it for securing child
seats. To wear it, attach it to the regular safety belt.
For more information, see the instruction sheet that
comes with the extender.
2-38