The LS9 seat is the reason this list exists. It is a Faurecia-supplied mechanism that the maker markets as 4D, and it appears here both as a complete seat and as the bare massage mechanism, which is the part that actually wears out. Front, middle-row and zero-gravity variants are all represented, along with two steering wheel generations.
What sits inside the seat
Four layers can be separated in these listings. The structure is the frame and the adjuster tracks, which set the number of movement axes. The mechanism is the massage unit itself, listed here as a mechanical type rather than a pneumatic one, so it relies on moving elements driven from a small motor rather than on air bladders. The comfort layer is the foam, the leather cover and the long leg rest. The control layer is the module and harness that translate a seat switch press into movement. Because the same mechanism appears as a bare part and as a complete seat, the list is unusually useful for anyone studying how the three comfort features, massage, zero gravity and leg rest, share the same frame without interfering with each other.
Trim and configuration matter more than model year
The LS9 carries the 4D mechanism in both front and middle rows, and the middle-row right seat appears on its own as a zero-gravity unit. Upholstery in these listings is beige leather, which makes colour matching the practical problem rather than fit. Power adjustment and lumbar support appear on the driver and passenger seats, with the passenger unit additionally carrying the long leg rest, so the two front seats are not mirror images and should be bought by position rather than as a pair. Steering wheels split by generation: one wheel is LS9-specific with multi-function buttons in leather, while a second part spans L6, LS6, L7 and LS7, which tells you those four share a column interface.
Parts list 12 items
Upholstery is described by colour where known and wear is visible on used items. Mechanism-only listings include the mounting frame and are supplied without foam or trim.
What to inspect before buying
Buy this group by mechanism, not by appearance, because a seat that looks clean can still have a worn drive. On a mechanical massage unit, ask for the unit to be cycled and for a note on how many programmes respond, then inspect the moving elements for flat spots and the linkage for play. Compare the part number across listings, since front and middle row mechanisms are often separate numbers even when they look identical. Zero-gravity seats should be checked for track wear and for whether the recline actuator holds position under load, which is the failure that shows up first. Leather is a secondary matter but affects value: look for cracking along the bolster seam rather than for surface sheen. On the steering wheels, confirm the airbag and clock spring are not included, and check the multi-function button contacts, which is the usual first casualty.
Availability and enquiries
Seats are bulky single units and mechanisms sell separately. Additional photographs, upholstery close-ups, mechanism travel video and shipping weights are available on request.
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