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Home >> BMW >> 2000 >> X5 >> Repair and Diagnosis >> Electrical >> Body Electrical >> Central Body Electronics (ZKE III) - Overview - E38, E39 & E53 >> Central Body Electronics (ZKE III) >> Seat/Mirror/Steering Column Memory >> Passenger's Seat (Without Memory) >> Notes

Passenger's Seat (Without Memory): Notes

The passenger seat control switch is purely a mechanical switching module that activates the passenger seat motors without position monitoring capabilities. Due to the limited operation requirements, the passenger seat control switch is not equipped with on board diagnostics.

The Passenger Seat control switch is equipped with an overload protection function. If excessive amperage is drawn due to a defective motor or a switch is stuck driving a motor to the end limit, the function activates opening the motor control circuit.

Passenger Seat Motors - Each motor is individually controlled by the Seat Control Switch. Each position motor is connected to the seat position switch by a two wire circuit providing motor activation in both directions (no position recognition).

Passenger Seat Adjustment - Operation of the passenger seat is always possible regardless of the ignition key position. Moving a position switch operates a the motor control contacts directly, the switch applies voltage and ground path directly to operate the motor. Reversing the switch simply changes the motor polarity. More than one passenger seat motor can be run simultaneously.