Seats: Description and Operation

Power is supplied to the driver seat adjuster switch from the POWER SEAT CIRCUIT BREAKER D through circuit 340. There are three reversible motors that operate the power seat. The front height and rear height of the seat are operated by separate motors. Each can be raised or lowered independently of the other. When the ENTIRE SEAT adjuster switch is pushed to the UP or DOWN position, both motors run to move the front and rear of the seat at the same time.

The forward/back adjuster motor is operated by the ENTIRE SEAT adjuster switch. When it is held in the FORWARD position, battery voltage is applied through the switch contacts and circuit 285 to the forward/back adjuster motor. The motor is grounded through circuit 284 and the seat adjuster switch through circuit 150 to G302.

In the BACK position, circuit 284 receives battery voltage and circuit 285 is grounded. This reversed polarity causes the motor to run in the opposite direction and drive the seat backward.

The front height and rear height adjuster motors work in a similar way when the FRONT HEIGHT or REAR HEIGHT switch is operated.

To raise the entire seat, the ENTIRE SEAT adjuster switch is held in the UP position. This applies battery voltage through circuit 282 and circuit 286 to the rear height adjuster motor and front height adjuster motor. The motors are grounded through circuit 283 and circuit 287 and the seat adjuster switch through circuit 150 to G302. Both motors run to drive the entire seat up. A similar action occurs to move the entire seat down.

Each motor contains a solid state self-resetting circuit breaker to protect it from overload. Electronic Circuit Breaker (ECB) resistance increases if a motor is overloaded and returns to normal after voltage is removed from the motor terminals.