2009 GMC Sierra 1500 Crew Cab Owner's Manual - Page 506

For regular cab models, the equipment you will need is behind the passenger's seat. For extended and crew cab models, the equipment is on the shelf behind the passenger's side second row seat. 1. Turn the knob on the jack counterclockwise to lower the jack head to release the jack from its holder. 2. Remove the wheel blocks and the wheel block retainer by turning the wing nut counterclockwise. 3. Remove the wing nut used to retain the storage bag and tools by turning it counterclockwise. You will use the jack handle extensions and the wheel wrench to remove the underbody-mounted spare tire. Extended Cab A. Wing Nut Retaining Tool Kit B. Tool Kit C. Wheel Blocks D. Jack E. Jack Knob 5-96