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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY Powered seat retrofit (WIP)



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woodpecka's Avatar
woodpecka
01-24-2011
This topic was a WIP research about how to do the electric seats retrofit. We discovered there are so many car configurations that it's impossible to do 1 guide for all. So, we prefer to share our notes and you must do your own research to validate your car and seats FROM -> TO configs.
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  #198  
By J66 on 10-02-2013, 06:40 PM
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Quote:
Originally Posted by woodpecka View Post
1- Adding the K_CAN connection to the driver seat with twisted wire gage #18 - #21
1A- K_CAN H on x275 pin#2 / x14271 pin#46 (or any K_CAN H wiring in the car like the radio, heat or Idrive controler - green/orange wire)
1B- K_CAN L on x275 pin#3 / x14271 pin#10 (or any K_CAN L wiring in the car like the radio, heat or Idrive controler - green wire)
can you help how to connect these wires, seems like if i use external battery power it on, it will work for a bit when i stop it will not work again. thinking if these 2 wires has anything to do with it.
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  #199  
By J66 on 10-02-2013, 10:30 PM
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Quote:
Originally Posted by dasammy View Post


SUCCESS!!

Yes, these mini-connectors work well. I checked them with a multimeter after connecting the cables. Its a solid connection.

In short:

I disassembled the seats and looked at the connector at the car side. There were 2 things I recognized:

1.) The Power supply of the seat heating module was on Pin9 .. so I had to pin it out and pinned it to pin4 (car side)

2.) The yellow/white cable (pin6) also was at the old passenger seat, but it had no connection to any pin of the connector at the car side
So its completely useless

I tooked the side-airbags and seat belt fastener from my old seats. Airbags and seat belt fastener fit the normal seats as well as the sport seats.
BUT ITS JUST FOR E92/E93 ... FOR E90/E91 AIRBAGS OF THE NORMAL SEATS AND SPORT SEATS ARE DIFFERENT!!

I connected the K_CAN wires to the iDrive by soldering.

The seat positioning wont work if K_CAN is not connected! Lumbar and side bolsters are working, but the positioning wont!
Just after connecting the K_CAN it worked ...

The strange thing about that is: in the tests with my PC power supply it worked like a charm ...

Seat heating is also working ... without coding
Memory buttons are working


Greetings!

EDIT: bridged the wires on the seat side.
Dont know the part # of the connectors ... in Germany you can buy them at any hardware store
can i know where the idrive is so i can connect kcan pin2 and pin3?
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  #200  
By Gemballa1980 on 10-04-2013, 04:01 AM
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Quick question: Can you install Sports seats without the side airbags?

I have an E90 with SE seats. I just purchased a set of E87 MSports seats, which arrived today. Unwrapped them and the salvage yard removed the side airbags!

So now I have to either buy them off them or look for a second hand set.

So: Can I install them as is and just connect them when I get them? Or will that through errors etc and more trouble than it's worth?

Also, Are all E87 / E90 Sports seat airbags the same, or some have different connectors etc??

Thanks!
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  #201  
By woodpecka on 10-04-2013, 08:16 PM
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Quote:
Originally Posted by Gemballa1980 View Post
Quick question: Can you install Sports seats without the side airbags?

I have an E90 with SE seats. I just purchased a set of E87 MSports seats, which arrived today. Unwrapped them and the salvage yard removed the side airbags!

So now I have to either buy them off them or look for a second hand set.

So: Can I install them as is and just connect them when I get them? Or will that through errors etc and more trouble than it's worth?

Also, Are all E87 / E90 Sports seat airbags the same, or some have different connectors etc??

Thanks!
I don't think so, you will always have an airbag red light error.

If you want one, I have a sport RH seat airbag for sale. PM me.
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  #202  
By J66 on 10-05-2013, 11:51 AM
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Quote:
Originally Posted by woodpecka View Post
I don't think so, you will always have an airbag red light error.

If you want one, I have a sport RH seat airbag for sale. PM me.
for the passenger side, is there a specific wire to activate head seat? or just connecting the 12V+ and short the 2 ground will work?

thanks,
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  #203  
By gmaturi on 10-08-2013, 07:35 PM
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How do you disconnect the harness under the seat?

I have removed the front passenger seat from my 2001 330 BMW, but cannot unconnect the harness, and I'm afraid I might break it. Is is a yellow connector plugged into a black connector
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  #204  
By Gemballa1980 on 10-12-2013, 08:53 PM
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Quote:
Originally Posted by Gemballa1980 View Post
Quick question: Can you install Sports seats without the side airbags?

I have an E90 with SE seats. I just purchased a set of E87 MSports seats, which arrived today. Unwrapped them and the salvage yard removed the side airbags!

So now I have to either buy them off them or look for a second hand set.

So: Can I install them as is and just connect them when I get them? Or will that through errors etc and more trouble than it's worth?

Also, Are all E87 / E90 Sports seat airbags the same, or some have different connectors etc??

Thanks!
UPDATE: So I can confirm that E87 seats fit into an E90!

Seats (both original and replacement) have everything bar heating.

As a test, I just plugged them in with no modifications.

Driver side: No bolster or lumbar power. Movement Ok - havent tested memory.
Passenger side: Nothing worked. As per first page of this thread, I moved pin 9 to pin 4 - Everything now works, including bolsters & lumbar.

I'll tackle bolster and lumbar on the drivers side tomorrow.
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  #205  
By Audentia on 10-18-2013, 05:23 PM
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How do you actually go about moving pins? (lumbar bolster only)

OK, so first of all, just making sure I got it right, i basically want to move PIN4 to PIN7 (my car and seat is after 3/2007) and PIN8 to PIN13 on the Car harness to get lumbar working. See my attachment.

How do i actually go about moving those? I realize i will have to take the Yellow protector off, but after that i dont really know what to do. Moving the wires? Adding little jumper ones? Anyone have photos of what they did?

Which this leads to another question, am i just moving the pins, or duplicating them, it seems the seat will still need a GND at PIN8 and 12v at PIN4 "used for seat module"
Attached Images
File Type: pdf BMW seats.pdf (2.34 MB, 106 views)
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  #206  
By Audentia on 10-18-2013, 05:26 PM
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remove harness

Quote:
Originally Posted by gmaturi View Post
I have removed the front passenger seat from my 2001 330 BMW, but cannot unconnect the harness, and I'm afraid I might break it. Is is a yellow connector plugged into a black connector
For my 2008 328 e90
Theres a black part of the yellow connecter, you pull that out a little bit. Then, keep wiggling and pull apart the yellow harness form the seat harness, You should notice that black tab move further and further out as the yellow plug comes out. Eventually it all pops out.

Dont know if that helps for your 01 though...
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  #207  
By Audentia on 10-18-2013, 05:30 PM
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How did you move the pins on CAR harness?

Quote:
Originally Posted by J66 View Post
My car is e90 2008 Manual seat with Heated. i brought 2009+ e90 m3 Power, Heated, Lumber and Bolster.

Passenger side:
I started installing the Passenger side, instead of changing the PIN on "Seat", i was easier for me to change the "CAR" so i swap 12V+ from pin#9 to pin#4 and Ground from pin#8 to pin#13 and got the seat moving (Front back, up down, tilt, etc)

Driver side:
Left it the way it is, did not work, moved pins from "CAR" just like passenger side 12V+ from pin#9 to Pin#4 and Pin#8 to pin#13, STILL DOESN"T WORK. then i kept 12V+ on PIN#4 and moved Grount back to PIN#8 STILL NO GO! looking at the seat i don't see a male for pin#9.

i just want to be able to move the seat so i can drive the car and get the bolts on. Can anyone give some advice?
Do you just pull out the wires from back of harness and push him back in other slot?
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  #208  
By J66 on 10-27-2013, 09:11 PM
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Quote:
Originally Posted by Audentia View Post
Do you just pull out the wires from back of harness and push him back in other slot?
yes
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  #209  
By Najt on 12-04-2013, 09:44 AM
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Hi,

I have semi-electric sport textil heated seats with side bolsters and without memory



and i bought:

full electric leather heated with memory , side and lumbar bolsters


what i have to channge please? there is a lot of information which I dont uderstand. thanks
Last edited by Najt; 12-04-2013 at 04:47 PM.
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  #210  
By Najt on 12-09-2013, 05:36 AM
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  #211  
By woodpecka on 12-09-2013, 07:19 PM
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Quote:
Originally Posted by Najt View Post
If I was you, I would read the full thread 2 times and making sure I understand how this works. There are so many car configurations, nobody can tell you without doing the full investigation.
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  #212  
By largeproject on 12-27-2013, 02:06 PM
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Does any one know what the part numbers are from the pins for the can bus ato conect it in the yellow conection (male/female)?

Thanx.

sorry for mine bad Englische.
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  #213  
By Najt on 12-29-2013, 03:35 PM
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Now I really need help. I have tried to switch seats:


OLD: semi electric, side bolsters, heated
NEW: full electric, side bolsters, lumbar and heated

As I see new seats has "seat module" therefore pin1 and 5 is not required for heating. But also power cabel at pin 9 is missing. Anyway I have tried to connect the new seat to the car seat cable.

Positions, side bolsters, lumbar works fine. Excep the heating. Coz I dont connected K-CAN cabels for pin 2,3 . But after few seconds. The seat leveling/position stops works. But if i reset some of the Pin 2,3 it will start working again. So I guess the position stops working, coz the seat module has no comunication.

Now, questions:
1) Is it OK, that the new PASSANGER seat has only pin 4 and 7 as power cabel and not PIN 9?
2) From where should I connect the K-CAN cabel + - ? Can somebody give me some picture?
3) Will the heating works , if there will be still cabels for PIN 1 and 5 for the old heating?


passanger schema


seat module


new passanger seat


old passanger seat


idrive controller cabels

//edit:
So I was right , the position will not work until KCAN cables will be connected. But can somebody tell me which cables should I bridge from iDrive controller? just the green and orange?

Quote:
Originally Posted by dasammy View Post


SUCCESS!!

I connected the K_CAN wires to the iDrive by soldering.

The seat positioning wont work if K_CAN is not connected! Lumbar and side bolsters are working, but the positioning wont!
Just after connecting the K_CAN it worked ...


Seat heating is also working ... without coding
Memory buttons are working
Last edited by Najt; 12-29-2013 at 04:14 PM.
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  #214  
By Najt on 12-31-2013, 09:15 AM
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from where should I connect K-CAN cables for driver and passanger seat please? any pictures?
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  #215  
By largeproject on 12-31-2013, 05:02 PM
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Yes, the 2 wirings on the left side, green and orange, those 2 wires are twisted .
And you have to conect them on posion 2 and 3 from the big yellow conection, if you see the conection on the seat side, you will see the same colours (green/orange).
You only have to do that for the drivers seat.
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  #216  
By Najt on 01-01-2014, 09:33 AM
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I am little bit confused. PIN 2 is green cabel, and PIN 3 is green/orange cable.
But here is only Green and Orange. So I dont know how properly should I connect the cables. Green to Green, and then twist green with orange and connect to PIN 3?

I think I have to connect also passanger seat. coz the position will stop work without comunication.
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  #217  
By largeproject on 01-01-2014, 02:31 PM
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Yes, that is correct.
Passengers seat has no memory, some seats have also a big black box, but as far I can see on the picture, your seat have a small box.
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  #218  
By Najt on 01-02-2014, 08:59 AM
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what is correct? yes i know that passanger seat has no memory. But the small black box is for the origin seat, the brown leader seat has big seat module. I've tried to connect the connector, but after few seconds the positioning stoped,coz no KCAN cabel was connected to the passanger seat.
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  #219  
By Najt on 01-12-2014, 04:28 PM
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