2003 GMC Yukon Owner's Manual - Page 23

{CAUTION: If the support rod isn't properly engaged, the folded third row seat could come loose in a sudden stop or crash. That could cause injury to people and damage to your vehicle. Always be sure the support rod is properly engaged when the third row seat is folded forward. Once the third seatback has been folded down, the entire seat can be tilted forward to create a flat load floor. To do this, do the following: 1. Enter the rear cargo area of the vehicle. 2. Make sure the head restraints have been lowered completely. 3. With the seat folded, unlatch the seat from the floor by pulling up on the lever located under the carrying handle at the rear of the seat labeled 2. 4. Lift the rear of the seat up, off the floor. You will not be able to unlatch the seat from the floor unless the seatback is folded down. 5. Tilt the seat fully forward and secure it in place using the support rod located on the underside of the seat on the passenger's side. Make sure the rod pin is fully engaged in the lock. 6. Push and pull on the seat. Make sure the support rod is holding it firmly in place. Use the seat in this position only when necessary for additional cargo space. 1-17