2006 GMC Envoy Owner's Manual - Page 16

To return the seat(s) to the original position, do the following: {CAUTION: If the seatback is not locked, it could move forward in a sudden stop or crash. That could cause injury to the person sitting there. Always push and pull on the seatback to be sure it is locked. 1. Lift the seatback until it locks into the upright position. Push and pull on the seatback to make sure it is locked. 2. Return the head restraints to the upright position by reaching behind the seat and pulling it forward until it locks into place. Push and pull on the head restraint to make sure that it is locked. 3. Flip the seat cushion back into place. 1-10