Three reversible motors operate the power seats. The front and the back heights of the seat are controlled by different motors. These motors can be raised or lowered independently of each other by pushing the front or the rear height switch. Both motors move the front and the back of the seat at the same time when the entire seat switch is pushed to the up or the down position.
The forward-back motor is operated by the entire seat switch. Battery voltage is applied through the switch contacts to CKT 285 and the forward-back motor when it is held in the FORWARD position. The motor is grounded through CKT 284 and the contact of the entire seat switch to ground. The motor runs to drive the seat forward until the switch is released.
CKT 284 receives battery voltage and CKT 285 becomes grounded when the entire seat switch is in the BACK position. This reverse 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 the rear height switch is operated.
The entire seat is raised when the entire seat switch is held in the UP position. This applied battery voltage to CKT 283 and CKT 287, and ground to both the front height and the 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).
The PTC resistance increases under the following occurrences:
| • | When the seat switch is held too long with the seat obstructed |
| • | After the seat is fully up or down |
| • | After the seat is forward or back |
The resistance returns to normal after voltage is removed from the motor terminals.
