Hello,

I have a 2005 e500, my dynamic seats are acting weird.

The driver's seat has codes
9258- leak air at cushion of left seat - seat cushion depth
9260- no or insufficient pressure supply

All the adjustments and pulse work perfectly but when I turn the dynamic on, only the right side will inflate while turning left but the left side won't inflate when i'm turning right.

The passenger has no codes but the dynamic seat light flashes quickly once, I can hear a click in the middle of the back rest and nothing happens. The pulse flashes and I believe it works for a minute or so and shuts off.

All seat adjustments work with the passenger seat so not sure what's going on.

DSP-Pneumatic pump for dynamic seat has no codes either.
But when I run an active test to actuate it, I don't hear anything.
When I run an active test to perform overpressure run , I hear a slight noise from behind driver's seat.
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Would the seat adjustments all work if the pneumatic pump wasn't functional?


Edit: live data in Dsp-pneumatic pump shows 27psi but still will not actuate via my scanner, it says preconditions not met. One code after driving around, 9250 "pressure build up is impossible owing to a leak"

Is the pneumatic pump the pump for my airmatic suspension or the one in the trunk lining for my dynamic seats??

EDIT:

I narrowed it down to this
9254 - pressure relief valve for draining opens without active overpressure run

But when I search all that pops up is for the airmatic suspension. This is the pump in the trunk for the dynamic seats. Checked for leaks, couldn't see or hear anything and it does hold pressure and I can actuate it now, but it goes up to 21 psi max and it will hold there and it should be able to go up to 38 but it doesn't. No sound of a leak or anything in the seats or trunk area. Can't release any Pressure via my scanner either.

 

Pump in trunk is for dynamic seats. Suspension pump is located up front below driver's side headlight. I once had something similar to yours, car got sold a couple of years ago, so I accessed pump in trunk on driver's side and it was a loose air hose going into pump. So I re-attached it well and put a plastic tie around it. Hopefully, Kajtek1 sees this and adds his 2 cents, he's very knowledgeable about this and even came up with a way to rebuild that pump.

 

Yeah there seems to be some confusion online when I search for the pump issue it always seems to come up as an aromatic while I'm trying to search for the dynamic seat pump in the trunk. the pump does work but it will only go up to 21 PSI when it should go to about 38 PSI. I read that the pump is super loud when you take it out of the housing but with my pump it's not loud but it still does create pressure like I said up to only 21 PSI and won't go any further. It says insufficient pressure or an air leak but I checked all the airlines there is no air leak as well as there is enough pressure but the pump does not turn on again I'll have to restart my vehicle for the pump to restart again and pump it back up to 21 PSI.

 

Revisit air lines (both pump & reservoir) reattach all lines/connections making sure they are tight. Valve is part # 2118001878 but good luck trying to find it.