Three reversible motors operate the power seats on vehicles
with the 6-way power seat option (AG1). On vehicles with the 4-way power seat
option (AH3), one motor operates the up-down movement of the seat only. The
front and back heights of the seat are controlled by different motors. The
motors may be raised or lowered independently of each other by pushing the
front or the rear of the power seat switch. When the entire power seat switch
is pushed to the UP or the DOWN position, both motors operate in order to
move the front and back of the seat up or down at the same time.
The power seat switch operates the forward-back motor. When the power
seat switch is held in the FORWARD position, battery voltage is applied through
the switch contacts to CKT 285 and the forward-back motor. The motor
is grounded through CKT 284 and the contacts of the power seat switch.
The motor runs in order to drive the seat forward until the switch is released.
When the power seat switch is in the BACK position, CKT 284 receives
battery voltage and CKT 285 is grounded. This reverse polarity causes
the motor to run in the opposite direction. This action drives the seat
backwards.
The front and rear height motors operate in a similar way when the front
or the rear of the power seat switch is operated.
When the power seat switch is held in the UP position, the entire seat
is raised. Battery voltage is applied to the following circuits:
Ground is applied to the following circuits:
Both motors run in order to drive the entire seat upward. A similar
action occurs in order to move the entire seat downward.
Each motor is protected by a built-in electronic circuit breaker (PTC).
The PTC resistance increases under the following conditions:
• | The power seat switch is held too long with the seat obstructed. |
• | The seat is fully down. |
• | The seat is fully forward. |
• | The seat is fully back. |
The resistance returns to normal after the voltage is removed from the
motor terminals.