Grand Cherokee 4WD V8-4.7L (2003)
Fig.11 Power Lumbar Adjuster
LUMBAR MOTOR
The ten-way power 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, just forward of 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.
