See also:

Head Restraint Adjustment
Do not drive until the head restraints for all occupants are installed and adjusted properly. For more information see Head Restraints. ...

OnStar®
If the vehicle has OnStar and you subscribe to the OnStar services, please refer to the OnStar Terms and Conditions for information on data collection and use. ...

Manual Seats
1. Lift the bar under the seat to unlock the seat. 2. Slide the seat to the desired position and release the bar. Try to move the seat to be sure it is locked in place. See Manual Seats. ...