Operation CHARM: Car repair manuals for everyone.
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Principles of Operation (How Does It Work?)

The operation of the seat is controlled by a bi-directional switch which controls the power seat height adjustment.

Seats with power height adjustment retain manual adjustment controls to attain seat adjustment. The bi-directional switch controls the operation of a single bi-directional motor which depending on switch operation will either operate the motor to raise the seat height or lower the seat height through a series of mechanical linkages.