2010 GMC Terrain Owner's Manual - Page 46

2-20 Seats and Restraints 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 the vehicle has side impact airbags, safety belt pretensioners can help tighten the safety belts in a side crash or rollover event. Pretensioners work only once. If the pretensioners activate in a crash, they need to be replaced, and other new parts for the vehicle's safety belt system may be required. See Replacing Safety Belt System Parts After a Crash on page 2‑24. 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 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. 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 up or down without pressing the release button (A) to make sure it has locked into position. Press the release button to lower the height adjuster.