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      06-01-2013, 02:15 PM   #1
mtherr
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Seat Upgraded with Lumbar Support

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Hello Group!

Here is my first real contribution...

It did not take long before I discovered I was not comfortable in my new BMW. I did not buy the Executive package which included a backup camera, a garage door opener and lumbar supports in both seats. Just did not think about it... this was a 1500$ option. So, I decided to retrofit the lumbar support components into my driver seat. I found all the required part numbers on RealOEM.com, I ordered the parts and I did the upgrade on a Saturday morning. This project cost me a bit more than 600$.






I know this have been done on various previous BMW models:

http://www.e90post.com/forums/showthread.php?t=494469
http://www.tmk.com/lumbar/index.shtml
http://aircooled.suomalainenverkkoka...uxfw1hj5yq.pdf


These are the parts I ordered. Lumbar support with pump (and valve), switch assembly, 10 pigtails (11 were required), wiring kit. I did not find the part number for the back rest wiring kit (to pump and valve). So, the main wiring kit is optional; the job can be done with a dozen bushing connectors.

The parts are:
61129258232 (wiring) - it contains a full wiring kit for the seat bottom, but not for the valve and pump. Unless I get a complete wiring kit, I would not order this again.
61319276621 (switch module for electric with memory, lumbar, not sport)
52107284041 (lumbar support pad with pump and valve)
52201964201 (little clips to close the seat back panel --- but I did not use them as I prefered the Ford clips)
61130006663 (bushing contacts. I ordered 10, but 11 were needed. If you do not order the wiring set, 10 or 18 should do (depending if you want to have connections to a separate back seat harness). You may also consider a Molex connector

I ordered a connector housing, hoping it would fit the valve, but it did not... I just inserted the pins in the valve connector and the pump.
61130006664 (pin contacts - not required unless you want to make connections underneath the seat to a back seat harness - 4 would be required)


Here is a link to a photo album of this project (with captions for each pictures):
https://picasaweb.google.com/1174324...eat=directlink


Before starting this project make sure you:
- confirm the parts you need on RealOEM
- get the seat wiring diagrams on TIS online (http://www.bmwtis.com/)
- unplug the negative side of the battery; otherwise you will get a driver restraint failure when you plug things back together

Last edited by mtherr; 06-01-2013 at 06:52 PM.
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      10-20-2013, 11:28 PM   #2
izen
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just wonder if there is any wiring diagram that can be shared?
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      06-22-2014, 10:42 AM   #3
maax227
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Hello,
Could you please post a wiring diagramm? I have a lot of problem with my lumbar support (retrofit).
Thanks a lot for your help
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