SL-Class (R231) 2013 on: Discussion on the SL550

SL/R231: Massage function inop

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Old Dec 16, 2025 | 02:18 AM
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Blumey's Avatar
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2013 SL 63 AMG and 2003 ML 500
Massage function inop

Indie diagnosed leaking line from pump to seats.I agree after testing pump and electrical. Replacement cost is high, and as I will have my car long term, I don't want to have to do it again. And again. Is there any solution besides the factory part or making it myself? Appreciate any feedback from those that have been here.
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Old Dec 16, 2025 | 06:58 AM
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Originally Posted by Blumey
Indie diagnosed leaking line from pump to seats.I agree after testing pump and electrical. Replacement cost is high, and as I will have my car long term, I don't want to have to do it again. And again. Is there any solution besides the factory part or making it myself? Appreciate any feedback from those that have been here.
There are many threads on this forum dealing with leaking seats... here's a few, as well as a link to parts that one member found useful. Some of the links also contain functional and wiring diagrams.
Good luck!

https://mbworld.org/forums/c219/5723...look-here.html
https://mbworld.org/forums/sl-class-...t-inflate.html
https://mbworld.org/forums/sl-class-...ml#post9191698
https://mbworld.org/forums/sl-class-...t-inflate.html
https://mbworld.org/forums/sl-class-...lfunction.html
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Last edited by hornethandler; Dec 16, 2025 at 07:04 AM.
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Old Dec 16, 2025 | 07:19 AM
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jmattioni's Avatar
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Originally Posted by Blumey
Indie diagnosed leaking line from pump to seats.I agree after testing pump and electrical. Replacement cost is high, and as I will have my car long term, I don't want to have to do it again. And again. Is there any solution besides the factory part or making it myself? Appreciate any feedback from those that have been here.
Had the issue on my 2014 SL. In my case the leaks were the hose fittings at the pump. I found it by slightly lifting the pump out of the foam cradle. I heard hissing noises as I did that. There's a small o-ring in each of those fittings. I treated the o-rings with silicone grease. Haven't had a problem since. I posted my findings on these forums, but I don't have a link to it at the moment.

You can have leaks in the bladders within the seats, at the hose fittings, and the plastic reservoir has been known to crack. It seems very unlikely that anywhere else along the hose is going to develop a leak.
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