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Home >> BMW >> 2000 >> 323Ci 2D Convertible, Automatic >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Central Body Electrics - Overview >> E46 Central Body Electronics >> Front Power Seats >> Seat Motor Activation >> Driver's Seat Adjustment

Driver's Seat Adjustment

When a position switch is moved, the control electronics of the SM receives an input signal to move the corresponding motor until the switch is released.

The position switch is also memorized for the requested direction (i.e.: slide forward/slide backward).

The SM includes a multiplexed switch unit that handles the polarity control and motor selection simultaneously.

Only one motor can be activated at a time.

The multiplexer control activates the polarity contacts and then the individual motor contacts to run the motors individually.

Fig 1: Circuit Diagram - Driver's Seat Motors
G03395771Courtesy of BMW OF NORTH AMERICA, INC.