Chevrolet TrailBlazer Owner's Manual page 410

TrailBlazer EXT
The jacking equipment you will need is stored under the
rear seat (TrailBlazer) or in the left rear quarter panel
storage compartment (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 1-7 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
underbody-mounted spare 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.