SL/R231: Extra weak massage
Now, when I select massage, it will start but I can only just barely feel it at first, then I can't feel anything. There is no buzzing sound, and the display still shows that massage is active.
A local indy pressure took apart the seat and tested the hoses in some way, and said there weren't any leaks. There aren't any codes. Any ideas?




Now, when I select massage, it will start but I can only just barely feel it at first, then I can't feel anything. There is no buzzing sound, and the display still shows that massage is active.
A local indy pressure took apart the seat and tested the hoses in some way, and said there weren't any leaks. There aren't any codes. Any ideas?








Location of components and functions.
https://mbworld.org/forums/sl-class-...lfunction.html
Good Luck!
Last edited by crconsulting; Apr 19, 2025 at 02:44 PM.
Now, when I select massage, it will start but I can only just barely feel it at first, then I can't feel anything. There is no buzzing sound, and the display still shows that massage is active.
A local indy pressure took apart the seat and tested the hoses in some way, and said there weren't any leaks. There aren't any codes. Any ideas?
How did you fix the issue of buzzing sound and turning off?
thank you
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Pull the trunk liner and the pump will be on the left encased in a foam cradle. You can carefully lift the top of the cradle off to see the pump. To avoid noise the pump floats within the foam cradle and is not fastened to anything. Gently lift the pump a couple of inches out of the foam cradle and listen for air escaping. If you hear air then it's the hose fittings at the pump.
Testing the reservoir is more involved. A smoke test is one way to do it.
As I recall, there is a leak down test in Xentry that can help isolate the location of a leak.
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Here's the part you're looking at:
R231 Lumbar/Massage bladder.
Last edited by crconsulting; Jul 25, 2025 at 01:11 PM.



