Chevrolet 2004 TrailBlazer Owner's Manual page 368

TrailBlazer EXT
The jacking equipment you will need is stored under the
rear seat in the TrailBlazer or in the left rear quarter
panel storage compartment in the TrailBlazer EXT. To
release the jack from its holder, turn the knob on
the jack counterclockwise to lower the jack head. See
Rear Seat Operation on page 1-6 for more information
on accessing the jacking equipment.
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The tools you'll be using include the wheel wrench (A),
wheel blocks (B), extension(s) (socket end) (C),
handle (jack end) (D), and jack (E). The Trailblazer EXT
will include an additional extension
The following instructions explain how to remove the
spare tire mounted underneath your vehicle.
Notice: If you remove or restow a tire from/to the
storage position under the vehicle when it is
supported by a jack, you could damage the tire
and/or your vehicle. Always remove or restow a tire
when the vehicle is on the ground.