Power Seats System Description and Operation
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Power Seats System Description and Operation
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The driver and passenger power seat systems each consist of the following components:
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Seat front vertical motor
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Seat rear vertical motor
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Seat back recline motor
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F13DA 25 A circuit breaker (LHD)
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F12DA 25 A circuit breaker (RHD)
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The seat switches provide both power and ground to the selected seat motors. Battery positive voltage is supplied at all times to the driver and passenger seat switches through a 25 A circuit breaker located in the instrument panel fuse block. Ground for the driver and passenger seat switches is provided at G305.
All seat motors operate independently of each other. Each motor contains an electronic circuit breaker (PTC) that opens in the event of a circuit overload and will reset only after voltage has been removed from the circuit. There are four seat position motors and one lumbar motor. These are the horizontal motor, front vertical motor, rear vertical motor, and the seat back recline motor. The seat horizontal motor moves the entire seat forward and rearward. The seat vertical motors may operate independently to tilt the front or rear of the seat cushion up or down. Both motors can also run simultaneously to move the entire seat up or down. The recline motor moves the angle of the seat back forward or rearward.
All seat motors are reversible. For example, when the seat horizontal forward switch is pressed to move the entire seat forward, ground is applied through the switch contacts and the seat horizontal motor forward control circuit to the motor. With the horizontal motor rearward switch contacts closed to the switch B+ circuit, the motor runs in order to drive the entire seat forward until the switch is released. Moving the entire seat rearward works similarly to moving the entire seat forward, except that battery voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction. All seat motors are powered this way.
