GMC 2000 Safari Owner's Manual page 15

Manual Lumbar Support (If Equipped)
If you have this feature, there will be a knob located
on the inboard side of the driver and passenger
bucket seats.
Turn the knob toward the front of the vehicle to increase
lumbar support. Turn the knob toward the rear of the
vehicle to decrease lumbar support.
Power Seats (If Equipped)
If you have this feature, there will be a control pad
located on the inboard side of the driver and passenger
bucket seats.
The front control makes the front of the seat go up
and down.
The center control makes the whole seat go forward,
rearward, up or down.
The rear control makes the rear of the seat go up
and down.
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