Seats: Description and Operation

There are three reversible motors that operate the Power Seats. The front and back heights of a seat are controlled by different motors which can be raised or lowered independently of each other by pushing the Front or Rear Height Switch. When the Entire Seat Switch is pushed to the "UP" or "DOWN" position, both motors run to move the front and back of the seat at the same time.

The Forward-Back Motor is operated by the Entire Seat Switch. When it is held in the "FORWARD" position, battery voltage is applied through the switch contacts to CKT 284 and the Forward-Back Motor. The motor is grounded through CKT 285 and the contact of the Entire Seat Switch to ground. The motor runs to drive the seat forward until the switch is released.

With the Entire Seat Switch in "BACK," CKT 285 receives battery voltage and CKT 284 is grounded. This reversed polarity causes the motor to run in the opposite direction and drive the seat backwards.

The Front and Rear Height Motors operate in a similar way when the Front or Rear Height Switch is operated.

The entire seat is raised when the Entire Seat Switch is held in "UP." This applies battery voltage to CKTs 283 and 287, and ground to both the Front Height and Entire Seat Switch contacts. Both motors run to drive the entire seat up. A similar action occurs to move the entire seat down.

Each motor is protected by a built-in electronic circuit breaker PTC. If a Seat Switch is held too long with the seat obstructed or after the seat is fully up or down, forward or back, the PTC resistance increases. The resistance returns to normal after voltage is removed from the motor terminals.