Chevrolet Uplander Owner's Manual page 11

Both indicator lights to the left of the symbol will be lit to
indicate that it is on the high setting. Press the button
a second time to go to the low setting. One indicator will
be lit. Press the button a third time to turn the heated
seat off.
The heated seats will turn off when the ignition is
turned to LOCK and will resume operation when the
ignition is turned to RUN, unless the button is manually
turned off.
Press this button once
to turn on the front
passenger's heated
seat to the high setting.
Reclining Seatbacks
To adjust a seatback, pull up on the lever located on
the outboard side of the driver's or front passenger's
seats. Release the lever to lock the seatback where you
want it. Push and pull on the seat to make sure it's
locked into position. Pull up on the lever, and the seat
will go to its original upright position.
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