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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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  #242  
By thihan01 on 04-28-2014, 10:29 AM
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Quote:
Originally Posted by phozenstone View Post
No the same power supply should work...I'm not really sure then. Even without kcan if you just wire power and ground to the seat you should have movement already. Maybe double check the connections again to make sure you've got the pins going to the right slot? Did you modify the seat wiring or your cars harness?


I've checked the connections several times. know it was the same thing on the driver's seat until I plugged in k_can. but like I said, I have no connection on the passenger side for k_can.
I have modify on the seat connector.
does not think I should have to recode the car when it works on the driver's side?
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  #243  
By phozenstone on 04-28-2014, 09:23 PM
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Since you modified the seat connector...did you check your cars harness to make sure the power and ground pins line up? In other words, my car initially came with manual seats so I had to modify my cars harness to have power and ground. I wired them based on the configuration of the seat I purchased. Interestingly enough, the wiring between the m3 seats I have now and my buddy's 335 is different so I had the move the pins around depending on which seat I'm using.

I did not have to so any coding for both seats to work
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  #244  
By darwin on 05-02-2014, 12:04 PM
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I want to swap a non sport heated seats for a sport heated seats E87. The plugs and pin, seems to be equal to the e90, does anybody know if the electric diagram is exactly the same.
Regards
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  #245  
By phozenstone on 05-05-2014, 10:16 AM
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yeh front seats for 1 series are identical to 3 series
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  #246  
By darwin on 05-06-2014, 12:52 PM
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Thank you
I was checking the wiring diagrams and I think that pins 2 and 3 belong to lumbar support and side bolsters, either one. But in the pictures that are upload in this post they said that pin nš7 is for lumbar support. Is that an error or is it correct. Can anybody clarify this, because I am trying to get power to lumbar and side bolsters from fuse box.
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  #247  
By phozenstone on 05-06-2014, 02:59 PM
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I would just disregard those pin diagrams and look at the actual seat harness to figure out the pin configuration. I have seen two different pin configurations between m3 seats and 335 seats. As long as you pair up the power/ground from the car's harness to the seat's harness then you will be fine.
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  #248  
By darwin on 05-07-2014, 04:08 AM
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Quote:
Originally Posted by phozenstone View Post
I would just disregard those pin diagrams and look at the actual seat harness to figure out the pin configuration. I have seen two different pin configurations between m3 seats and 335 seats. As long as you pair up the power/ground from the car's harness to the seat's harness then you will be fine.
Thx
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  #249  
By MrDunleavy on 06-27-2014, 03:33 PM
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So which wires are the K CAN wires connected to when hooked up to the radio?

I have all movement apart from forwards and backwards. Car is an E92 2008 (Pre-LCI) 320i coupe M-Sport.
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  #250  
By phozenstone on 06-27-2014, 07:13 PM
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There are KCAN wires everywhere. The easiest I found was right behind the glove box there are a bundle of wires there. The two kcan wires I believe we're green/yellow and green/orange but double check the thread to confirm as I did mine 2+ years ago
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  #251  
By MrDunleavy on 06-28-2014, 06:34 AM
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I still cannot get power to the forwards and backwards movement on drivers side (haven't started passenger side yet). RHD drive car.

I done the pin4 12v and pin8 gnd bridges but have yet to connect the K_CAN.

Should I be able to get power to the forwards and backwards movement prior to connecting up to K_CAN?
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  #252  
By phozenstone on 06-28-2014, 08:10 AM
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No you must connect kcan before the power move by works correctly. Otherwise they'll work only for the first few minutes after connecting the battery and not after that
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  #253  
By MrDunleavy on 06-28-2014, 02:01 PM
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thanks phozen, do you think if kcan is connected the forwards and backwards movement will function?

Sorry to keep asking questions....
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  #254  
By darwin on 06-29-2014, 03:48 AM
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I already have located the pins for lumbar and side bolsters on my sport seats, nš7 for power and nš13 for ground. Now I need to run the wire to the rear of the fuse box to connect to fuse 32, but I didnt locate any pic or DIY about how to dissasemble the fuse box and wich connector to use to tap my wire in the fuse box.
Can anybody help me?
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  #255  
By phozenstone on 06-29-2014, 05:42 AM
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Quote:
Originally Posted by MrDunleavy View Post
thanks phozen, do you think if kcan is connected the forwards and backwards movement will function?

Sorry to keep asking questions....
Yes after you connect kcan the movement will operate smoothly as intended
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  #256  
By phozenstone on 06-29-2014, 05:44 AM
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Quote:
Originally Posted by darwin View Post
I already have located the pins for lumbar and side bolsters on my sport seats, nš7 for power and nš13 for ground. Now I need to run the wire to the rear of the fuse box to connect to fuse 32, but I didnt locate any pic or DIY about how to dissasemble the fuse box and wich connector to use to tap my wire in the fuse box.
Can anybody help me?
Just tap into the fuse box. Pull out a fuse or find a fuse slot with 10amps and just plug the wire into that. No need to get behind the fuse box. Or get a fuse tap adapter which is what I ended up doing

http://www.ebay.com/itm/201101779715
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  #257  
By darwin on 06-29-2014, 06:55 AM
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Thx, just try this week
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  #258  
By darwin on 06-29-2014, 12:27 PM
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By the way I read in this post that if you only want to retrofit sport heated seats (not electric movement), you can simply connect pin 7(side bolster+lumbar support) to pin 9(heated system) and pin 8 (ground) with pin 13(ground). Then they have to share the same fuse, and as it is very hard to me to underestand the fuse diagram, can anybody confirm that they share the same fuse and in that case which fuse is that?
And do I need to switch on the heated system to inflate the side bolsters and the lumbar support?
Best Regards.
Last edited by darwin; 06-29-2014 at 02:47 PM.
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  #259  
By darwin on 06-30-2014, 02:43 PM
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Quote:
Originally Posted by phozenstone View Post
Just tap into the fuse box. Pull out a fuse or find a fuse slot with 10amps and just plug the wire into that. No need to get behind the fuse box. Or get a fuse tap adapter which is what I ended up doing

http://www.ebay.com/itm/201101779715
Thx, finally I found that the fuses for the heating module-f68(20A) and the lumbar and side bolsters f-20(30A) are diferent. So I am going to use the tap adapter you suggest, so no need to remove the fuse box, neither the junction box. My next question is about the ground, I have 3 options
1 bridge to ground on pin 8
2 run wires until x173
3 run wires until the bold in the seat.

Which option you think is the best?

Regards
Last edited by darwin; 07-01-2014 at 02:19 PM.
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  #260  
By phozenstone on 06-30-2014, 08:47 PM
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I bought a ring terminal at pepboys and just mounted it underneath the seat using the bolt. Works perfect and can't see it once seat is installed
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  #261  
By darwin on 07-01-2014, 02:28 AM
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Quote:
Originally Posted by phozenstone View Post
I bought a ring terminal at pepboys and just mounted it underneath the seat using the bolt. Works perfect and can't see it once seat is installed
Thx, finally it seems I am already done with this.
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  #262  
By MrDunleavy on 07-04-2014, 05:23 PM
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Did anyone manage to get heated seats working on a non factory heated car with no coding?
Last edited by MrDunleavy; 07-18-2014 at 06:49 PM.
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