2006 GMC Envoy Owner's Manual - Page 18

3. Lift the seatback up to return it to the upright position. Third Row Seat (Seven-Passenger) {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. 4. Push and pull on the seatback to make sure it is locked. {CAUTION: Be sure to return the seat to the passenger seating position when finished. Push and pull on the seat to make sure it is locked in place. Never use the third row seating position while the second row is folded or folded and tumbled. This could cause injury in a sudden stop or crash. To enter the third row seat, you must fold and tumble the second row seat following the instructions given previously. 1-12