GMC 2001 Envoy - Manual (Page 15)

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Manual Lumbar Support (If Equipped)
If your vehicle has this
feature, there will be a knob
on the outboard side of the
driver’s and passenger’s
bucket seats.
Turn the knob counterclockwise to increase lumbar
support and clockwise to decrease lumbar support.
Power Seats (If Equipped)
If your vehicle has this feature, there will be a control on
the outboard side of your seat.
Horizontal Control: Raise or lower the front of the
seat by raising or lowering the forward edge of
the control.
Raise or lower the rear of the seat by raising or lowering
the rear edge of the control. Move the seat forward or
rearward by moving the whole control toward the
front or the rear of the vehicle.