So my dynamic seat pump failed now if yours is not working I'll give you a few tips on how to fix it. I know a guy that works in a Mercedes dealer ship. He's a tech and I asked him. He gave me a motor that he had laying around and told me that it would work but I needed to take the whole pump apart which is fairly easy. Before you do this, if you hear your pump turn on then there's a piece inside that might be leaking which is easy to fix also. First thing to do is remove the clips on the plastic strip there are like 5 clips then pop each side out from the top. Then remove the plugs for the lamps on each side.
There are 2 tork screws. Remove them. There are also 2 clips on top of the left side carpet. There should be a gray pouch. Remove the 2 lines and the power plug. Sqeeze the box ( you should be able to pull it apart). Once you pull it apart there is a board on top. Unplug the board ( the motor and the board should come out together. There's a second board on the bottom screwed in by 3 screws. Look at the center of the board you should see a round piece. Check to see if the piece is seperated from the board. If the piece is loose snap it back in. I used some hot glue to seal it back up. If it is not leaking and the motor is bad, then the motor inside needs to be replaced. I will add pics later.

 

In for pictures as my dynamic seat is inop on the drivers side at this time

 

you mean both do not work right

 

No the passanger side seat works fine.....

 

thens its not your pump check under the seat as there 2 units threre

 

Cool what should I be looking for?

 

i believe threes 2 modules threre look you will see first lift the seat up turn off the car put it in pos 2 try to turn the seat on
oo i forget what happens if you try to put the pulse on do you get a light

 

anyways if your switch is bad then it will not come i would try to swich it first with the passengers switch and see what happens if not then see if threres a leak

 

Open your trunk with keys in hand press the unlock button if you hear your pump turn on check left side if you hear come then yOur pump is leaking in side the pumP you will see a borad look In the center of the borad
Theres a piece of plastic check to see if it's in place if not snap
It back in and glue it with a hot glue gun