GMC 2012 Terrain Owner's Manual page 70

3-16 Seats and Restraints
Shoulder Belt Height Adjuster
The vehicle has a shoulder belt
height adjuster for the driver and
right front passenger seating
positions.
Adjust the height so the shoulder
portion of the belt is on the
shoulder and not falling off of it.
The belt should be close to, but
not contacting, the neck. Improper
shoulder belt height adjustment
could reduce the effectiveness of
the safety belt in a crash. See How
to Wear Safety Belts Properly on
page 3 13.
Move the height adjuster up to the
desired position by pushing up on
the height adjuster.
After the height adjuster is set to
the desired position, try to move it
down without pressing the release
button (A) to make sure it has
locked into position. Press the
release button to lower the height
adjuster.
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 and near frontal crash if the
threshold conditions for pretensioner
activation are met. And, if the
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 are activated
in a crash, the pretensioners and
possibly other parts of the safety
belt system will need to be replaced.
See Replacing Safety Belt System
Parts after a Crash on page 3 20.