RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Power Seat Motor: Description and Operation
LUMBAR MOTOR
The power lumbar seat option includes an electrically operated lumbar support mechanism. The only visible evidence of this option is the separate
power lumbar switch control paddle that is located on the outboard seat cushion side shield, next to the other power seat switch control knobs. The
power lumbar adjuster and motor are concealed beneath the seat back trim cover and padding, where they are secured to a molded plastic back
panel and to the seat back frame.
The power lumbar adjuster cannot be repaired, and is serviced only as a unit with the seat back frame. If the power lumbar adjuster or the seat
back frame are damaged or faulty, the entire seat back frame unit must be replaced.
The power lumbar adjuster mechanism includes a reversible electric motor that is secured to the inboard side of the seat back panel and is
connected to a worm-drive gearbox. The motor and gearbox operate the lumbar adjuster mechanism in the center of the seat back by extending and
retracting a cable that actuates a lever. The action of this lever compresses or relaxes a grid of flexible slats. The more this grid is compressed, the
more the slats bow outward against the center of the seat back padding, providing additional lumbar support.
