S500 W220 Lumbar Support Problem

[davidbownes]

Hi, Good evening....

I am new to the forum, and indeed to Mercedes ownership. My father has had, and still runs a couple of E-classes including a 1998 E300TD with 270k miles (immaculate). I have just purchased, at 33 years old, my first Mercedes, a rather lovely 2003 S500 L, fully loaded in blue with the optional digital TV and wine fridge- excellent for a Saturday night out with the ladies...

However, the car has one fault, the lumbar support doesnt work for any of the seats. It did when I got the car, both the soft close doors and the trunk work perfectly, nothing else is wrong, just the lumbar support.

I have tried removing and replacing fuse 20- I think as all have gone at the same time it must be something electrical. Have looked on this forum and others and no ideas. Can anyone help??

 

[television]

You have a separate PSE pump in the boot side panel that operates the seats

 

[davidbownes]

Many thanks... is there a way to reset this??

 

[television]

I would check the fuse that feeds this pump, now in the event of a leak in a seat bladder the pump can turn itself off, in order to self protect itself and only STAR can turn it back on.

 

[davidbownes]

Ok- is this the 20AMP fuse under the rear passenger seat? I think it unusual that all lumbar fail at the same time and the soft close/boot/headrests etc still work- does the lumbar work off a different pump from these?

 

[television]

The soft close runs from the locking PSE pump thats under the rear seat. the lumber pump is on its own.

 

[davidbownes]

Ok.... Looked at the fuse diagram and i can't see which it is... anyone have any ideas which fuse runs the lumbar PSE?

 

[television]

F63 in the rear fuse block 30 amp.

 

[D'sS430]

Lumbar Pump does not work

David Bownes, I have exactly the same problem, 2000 S430. Pump and soft close work fine. But the pump never activates for the seat lumbar support. I took the pump out and briefly tested what I could. Air hose is OK, only pump does not turn on. Let me know if you find a cure, I'll do the same. Contact pogmopoll@gmail.com to help. Dan