benz_addict

I have them inflated to hug more but everytime I start the car and go for a drive the seat bolsters randomly just deflate and the buttons don't do anything and stop responding. If you take the key out and restart they will inflate again and stay like that for 10 minutes then again become deflated as your driving and the adjustment buttons become dead.

Took the fuse 20 out for the PSE pump to give it a reset but that did nothing. Did a battery pull but that did nothing. Dynamic seats also don't work (No inflation of the bolsters).

Any help appreciated

MBZFAN55

I just had the same issue on a 2013 W221 and it turned out to be a leak in one of the driver seat bolsters. I also noticed that all of the seat settings, including lumbar, massage etc had reset with the controls all being inoperative. Repairing the leaking bolster fixed everything. I'm thinking maybe I need to lose a few pounds.

corsaschnell

Yes the bladder do leak air after a few years and need replacing.

Fried Chicken

How do you replace the bladders?

MBSSix3

I too need to get instructions for replacing bladder.

I can tell you I just got back from dealer today. They want $1600 to replace bladder for right side bolster on driver seat.
Needless to say I walked away after having just spending $1300 to have pump replaced.

BTW. they said the pump may have burned up because it kept running trying to inflate leaking bladder. They recommended I turn of dynamic seats until I replaced leaky bladder or pump may burn up again.


Besides how to do it, does someone sell bladders besides Merc?

kyosuke

im gonna be taking apart my seat soon but idk how far im going to go in it. My a/c fan rubs against something if a person weighs too much in the car. soooo not sure if my fan is out of place of something but im really curious to see. If i find anything out this week ill let yall know.

Best case scenario you take of the bag and slide another in. Can anyone call mercedes and ask how much a new bladder is just for the part alone ?

kyosuke

just talked to mercedes for ya

117 for the bladder on the right 66.42 with whole sale discount
111.31 on the left and 72.98 with discount.

Daniel S65 Benz

go to eBay they have tested used ones cheap brother and the seat modules are cheap there too I bought all my replacements there