Seat backrest width - Keeps pumping up on its own

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  1. Seat backrest width - Keeps pumping up on its own 
    #1
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    I've just purchased a 320D M Sport (2008 LCI)and its got a problem with the seat. The backrest side supports keep pumping up on their own, I have to move the seat around (forward back / up down) and find a position when you can hear the pump stop.
    It sounds like I wiring fault, but I dont have access to any wiring diagrams on this unit so dont know where to start. I was hoping as a short term solution I would be able to unplug the switch or the electrical connection to the pump unit I get a time to look at the wiring properly.

    Would really appreciate any suggestions on how to diagnose this or get access to a wiring diagram so I can investigate. I've attached two pictures, the first viewing the seat from the drivers footwell, the other from the passenger footwell


    20131024_095346[1].jpg20131024_095440[1].jpg
     
     

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    edber's Car Details
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    I think you need to get the back panel off the seat as the pump and valve block is in there.
    I wonder if you tilt the backrest forwards and backwards can you make the pump go on and off?
     
     

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    johnyb (28-10-2013)

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    Quote Originally Posted by edber View Post
    I think you need to get the back panel off the seat as the pump and valve block is in there.
    I wonder if you tilt the backrest forwards and backwards can you make the pump go on and off?
    Ok thats interesting. Any ideas how to get the back panel off the seat.
     
     

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    edber's Car Details
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    There is a guide on this forum in the technical talk on the e90,e91,e92 and e93 section,its dated 16-09-2012 started by burtie8.
    It says that there is two clips at the bottom corners of the seat back but you will need to get new ones as they get damaged/destroyed upon removal.
     
     

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    johnyb (28-10-2013)

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    Thanks for the response. Found the fuse box and the relevant fuse, after removing it and moving the chair - reinstating the fuse stopped pumping on its own. Fingers crossed its solved its self (highly unlikely ...)
     
     

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