GMC 1993 Jimmy Owner's Manual page 19

Power
Drlver's
Seat
PO330
The left control makes the rear of the seat go up and down.
The right control makes the front of the seat
go up and down.
The center control makes the whole seat go up and down or forward and
rearward.
Power Lumbar Adjustment
PO331
If you have this feature, there will be a control on the front of your seat.
Press and hold the right side until you have the desired lumbar support.
To
decrease lumbar support, press the left side of the control.
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