Seats: Description and Operation

The Left and Right Power Seats are capable of being moved electrically forward, backward, up or down. They can also be tilted up or down in the front and in the back. They are controlled by a Power Seat Switch located at the seat. The Power Seats are powered at all times from the PWR ACCY Fuse A through the ORN (540) wire. The Left Power Seat is grounded by the BLK (150) wire at ground G20l. The Right Power Seat is grounded by the BLK (150) wire at Ground G402.

Each seat is provided with three motors. The Power Seat Forward,/Rearward Motor moves the seat forward and rearward. The Power Seat Front Tilt Motor moves the front of the seat up or down. The Rear Tilt Motor moves the rear of the seat up or down. The Front and Rear Tilt Motors, when operated at the same time, raise or lower the seat. The motors operate in one direction of the other depending on the direction of current flow. Each Motor is equipped with an automatic reset thermal Circuit Breaker. If seat motion is restrained, the Motor Circuit Breaker will heat up and open the circuit. This stops the current flow and the Circuit Breaker cools down. When the Circuit Breaker has cooled down enough, the Circuit Breaker automatically closes and the Motor may be operated again.

The Power Seat Switch consists of three momentary action lever switches. The switch contacts are closed only when the lever is held in position. The Front and Rear Tilt Motors are operated by two-position lever switches. When the Front Tilt Lever is moved to the up position, current flows from the switch through the DK GRN (286) wire to the Front Tilt motor Since the LT BLU (283) wire from the Motor is normally connected to ground in the Power Seat Switch, the Motor operates and the seat tilts up. It continues to operate until the lever is released or the seat reaches the end of travel. At the end of travel and with the lever switch still in place, the Motor will attempt to continue to operate.

When the Power Seat Switch's Forward-Rearward Up-Down Lever is moved to the up position, voltage is made available to both the Front Tilt Motor on the DK GRN (286) wire and the Rear Tilt Motor on the YEL (282) wire. Since the other Motor leads remain grounded in the Power Seat Switches, both motors operate at the same time to raise the seat without changing the seat's tilt. Current direction is reversed to both motors to lower the seat.