Grand Cherokee 2WD L6-4.0L VIN S (1997)
Power Seat Motor: Description and Operation
Power Lumbar Adjuster and Motor
SYSTEM OPERATION
There is a reversible motor that operates the power lumbar adjuster. The motor is connected to a worm-drive gearbox that moves the lumbar
adjuster mechanism through a cable and lever-type actuator unit.
When the power lumbar switch is actuated, a battery feed and a ground path are applied through the switch contacts to the motor. The motor
operates to move the lumbar adjuster mechanism in the selected direction until the switch is released, or until the travel limit of the lumbar adjuster
is reached. When the switch is moved in the opposite direction, the battery feed and ground paths to the motor are reversed through the switch
contacts. This causes the motor to run in the opposite direction.
The motor contains a self-resetting circuit breaker to protect it from overload. Consecutive or frequent resetting of the circuit breaker must not be
allowed to continue, or the motor may be damaged. Make the necessary repairs. The motor used on models with the optional memory system also
has a position potentiometer included in the motor assembly.
The power lumbar adjuster and motor cannot be repaired, and are serviced only as a complete unit with the seat back frame. If any component in
this unit is damaged or is faulty, the entire power lumbar seat back frame assembly must be replaced.
