Bonneville V8-4.6L VIN Y (2004)
Power Seat Motor: Description and Operation
Memory Seats
SEAT MOTORS
The MSM controls the movement of each of the above mentioned seat directional motors and the 2 lumbar motors. Refer to Lumbar Support Description
and Operation (w/o A45)Lumbar Support Description and Operation (with A45). All of the seat motors operate independently of each other. Each motor
contains a electronic circuit breaker (PTC), which will reset only after voltage has been removed from the motor.
There are 4 motors that move the position of the seat. These are the seat horizontal motor, front vertical motor, rear vertical motor, and the recline motor.
The horizontal motor moves the entire seat forward and rearward. Both vertical motors run simultaneously when the seat switch is operated in order to
move the entire seat up and down. Or they can be selected independently to vertically tilt the front or rear of the seat up and down. The recline motor
moves the angle of the seat back forward and rearward.
All motors are reversible. For example, when the seat adjuster switch is operated to moved the entire seat forward, battery positive voltage is applied
through the entire seat switch contacts and the power seat horizontal forward switch signal circuit to the MSM. In response to this signal, the MSM
applies battery positive voltage through the driver seat horizontal motor forward control circuit to the horizontal motor. The motor is grounded through
the driver seat horizontal motor rearward control circuit to the motor. The motor runs to drive the entire seat forward until the switch is released. Moving
the entire seat rearward works similarly to moving the entire seat forward, except that battery positive voltage and ground are applied on the opposite
circuits causing the motor to run in the opposite direction. All other seat motors are also powered this way.
The MSM provides each seat motor with a soft stop. The module will actually stop the motor just before the physical end-of-travel for that motor. This
decreases the stress on each motor. If a motor reaches the end-of-travel due a soft stop and the seat switch is released and then activated again, the seat
will move a short distance farther to the physical travel limit.
