CHEVROLET 1999 Corvette - Manual (Page 16)

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Sport Seat (Option)
In addition to the power seat control, there are three
other switches that help you change the shape of the
seat. There are two lumbar supports for the middle (A)
and lower (B) back. There’s also a side bolster switch
(C) that adjusts the sides of the seat around you to give
you more lateral support.
For lumbar support, move each switch (A and B)
forward to inflate or rearward to deflate.
Move the side bolster switch (C) up for more side
support and down for less support.
Reclining Seatbacks
The lever for the reclining seatback is located on the
side of each seat, near the base.
To adjust the seatback, lean slightly forward to lift your
weight off the seatback. Pull completely up on the lever
until it stops, and lean back to position the seatback to
where you want it. Release the lever to lock the seatback
into place.