Chevrolet TrailBlazer 2003 Manual page 10

To heat only the seatback, press the button with the
words "BACK ONLY". An indicator light on the seatback
switch will glow to designate that only the seatback is
being heated. Additional presses will cycle through
the heat levels for the seatback only. Press the
horizontal button again to heat the whole seat.
The feature will shut off automatically when the ignition
is turned off.
Reclining Seatbacks
If your vehicle has a manual recliner, lift the lever
located on the outboard side of the seat and push the
seatback rearward to recline the seatback. To return the
seatback to the normal position, lift the lever without
pushing rearward on the seatback and the seatback will
move forward.
If your vehicle has power seat controls, the vertical
power seat control described earlier allows the seatback
to recline.
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But don't have a seatback reclined if your vehicle is
moving.