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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY: E90 Lumbar Support Retrofit



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  DIY: E90 Lumbar Support Retrofit
E90 with Power Sport Seats
HomeBrew
02-27-2011
This is the installation of the driver side lumbar support in a 2006 BMW 330i with existing side bolster support (sport package).

I ordered the individual connectors, pins, and bushings for the new harnesses (details later). The dealer told me that the lumbar wiring might* be...
  #22  
By ins1dez on 08-23-2012, 06:52 AM
Hello

i already have MANUAL heated seats , and i want to install electric seats with loumbar support , do i need any other wires, i mean if the wires from my heated seats will work for electric seats and for loumbar support?
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  #23  
By Tomppa_AC on 05-06-2013, 05:31 AM
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Manually controlled heated seats also need both the new under-seat and backrest wiring. If your seat came from the factory without lumbar support then you have to replace the wiring in all instances, since it is missing the right connectors.
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  #24  
By akolev on 09-29-2013, 04:27 AM
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Question Any programming needed?

The seats on my E90 320d are non-sport, mechanical adjustment, heated.

Do you think that any programming will be needed after performing the installation as described above?
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  #25  
By Yury on 09-30-2013, 09:01 AM
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Quote:
Originally Posted by akolev View Post
The seats on my E90 320d are non-sport, mechanical adjustment, heated.

Do you think that any programming will be needed after performing the installation as described above?
No, no programming required. For lumbar support all you need is ground and "+" wire. You have it from the heating.
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  #26  
By johnyb62 on 10-24-2013, 08:34 AM
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 it's 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.
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  #27  
By akolev on 11-13-2013, 03:37 PM
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Arrow

Quote:
Originally Posted by Yury View Post
No, no programming required. For lumbar support all you need is ground and "+" wire. You have it from the heating.
Do you mean, that in my case I will surely need to tap the power of the heating? Is there any chance of overloading the fuse for heating when using both functions?
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  #28  
By Yury on 11-15-2013, 10:00 AM
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Quote:
Originally Posted by akolev View Post
Do you mean, that in my case I will surely need to tap the power of the heating? Is there any chance of overloading the fuse for heating when using both functions?
Just answer to yourself one question, how often would you change lumbar support setup? I believe, once you will adjust it in the beginning, then you will never change it, same as seat setup.
So, the chance that you will use seat heating and pump for lumbar support simultaneously is very low

Anyways, the risk is that you will burn the fuse for 20 cents ....
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  #29  
By stashtrey on 12-19-2013, 07:51 PM
Greetings. Good thread here!!

I have an e90 pre LCI with heated power seats including lumbar. Seats are non sport.

I just purchased a pair of pre LCI e90 Sport seats with power and lumbar as well as power side bolsters.

I'm thinking I will be losing the heat but wondering if I can use the wiring from the heat to power the side bolsters? I believe its a simple 2-way switch...should need positive and ground to run that bolster switch.

Any help or advice/thoughts very much appreciated!
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  #30  
By darwin on 05-02-2014, 09:42 AM
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Still help needed

Hi, finally I install the lumbar support and the wire harness on the seat. My seats are heated seats but my original seats werent sport, it was normal seats without side bolsters. So now I have already installed the seats, the heated systems is working but the side bolster and the lumbar support is not opperating I assume is bcz there is no power supply in the plug underneath the seats, (only to feed the heated system). I have to checked the wiring diagrams in the planet-BMW to wire my seat plug, but the wiring diagrams are not in the page of planet bmw. So I will appreciate if anyone can clarify this questions.
Which are the numbers of the pins for the side bolsters and the lumbar support?
Does they share the same fuse with the heated-seats system? In case I think I can get the power in the same wire that gives power to the heated system, right?
If not I think that better than plugging in the lighter I should get the power from the fuse box, in case of that, which is the number of the fuse for lumbar support and side bolsters.
My car is a E87, but I think that the diagrams are the same.
REgards
I
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