Multi Contour Seat Leak Hissing




Good luck.
Got the driver side leak figured out and temporarily rigged well enough to test. As the system powered and pumped up for initial testing, the hissing from the driver seat disappeared, but low and behold, a hissing from the passenger seat became evident! Batting a thousand here!
The hardest part of the driver seat repair was figuring out how to remove the front and side seat trim pieces. What a pain in the ***! I have WIS/EPC and although it helped, removal procedures were not 100% inclusive. I only broke a couple plastic thingys, so I'm pretty proud of myself! I'm not sure, but it looks like someone may even have already been under the seat to address a leak? A broken black plastic tab/thingy fell when I removed the front trim piece and I didn't touch anything black... Oh well, at least I didn't have to pull the seat entirely.
Anyway, the line that is leaking on the driver seat is indeed the line previously mentioned that routes along the outside of the seat. Old, brittle tubing that pretty much crumbled when I cut the end off and attempted to connect a new section of the rubber line. So now that I have ID'd the leak, and I'm pretty sure it'll be the same leak on the same line on the passenger seat (I haven't looked at the passenger side yet, no time) I'm going to completely bypass the factory line and not even mess with it. I'll hit up my local Ace Hardware for tubing tomorrow and wrap this up.
Total cost for repair, $1.17.
Going to vacuum really good, button the trim and seat panels back on and call it a day!
The Best of Mercedes & AMG
Biggest tip I can give is take advantage of the seat controls. I'm an idiot and wrestled with the right seat side cover with the seat in the low position before I remembered the seat can be raised vertically almost 6" along with lengthy forward and rearward positioning. Duh me!




You are right that the trim removal is the hardest part...the rest is replacing lines.
Now I have air supply, but one of the three lumbar support bladders still leaks. I tried to get to it, but got stuck as I don't know what I'm doing and will probably rip the leather. Would capping, pinching or otherwise plugging the line leading to the leaking bladder convince the computer that it holds pressure and allow the rest of the seat work?
Now I have air supply, but one of the three lumbar support bladders still leaks. I tried to get to it, but got stuck as I don't know what I'm doing and will probably rip the leather. Would capping, pinching or otherwise plugging the line leading to the leaking bladder convince the computer that it holds pressure and allow the rest of the seat work?
Not sure about capping. I presume you could disconnect a line from the module and blow into it to isolate leaking bladders, but as far as capping the module itself I'm not sure. I'm not sure how it measures/senses volume or pressure. Worth a shot though, the seatback covers are two screws. I still have a leak or something in the passenger side seat lower bolsters as they won't pump up but the driver side seat works fine so I don't care. I'll get to it someday.
I have a rough look of my under seat and cannot find a possible place that the pipe should connect to.
Thanks very much.
The loosen blue air pipe under the seat.




I have a rough look of my under seat and cannot find a possible place that the pipe should connect to.
Thanks very much.
The loosen blue air pipe under the seat.




