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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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      11-10-2022, 01:55 PM   #485
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Quote:
Originally Posted by shimstack View Post
Anyone seen this?

E91 with base (no power/heat) seats from factory. Previous owner installed power/heated M3 seats, and didn't complete the wiring. I added the heated seat switches, VO coded 494, and connected the K CAN bus wires to the driver's seat- I'll do the passenger in the next few days.

With the VO 494 coded and no K CAN connection the leds on the buttons would light up briefly and then turn off. No relay click, no heat on either side.

With the K CAN connected to the driver's side, the heater button lights up for 5-10 seconds, the relay clicks on and stays on unless I turn the seat heating off, but the leds blink on and off at ~5 second intervals. The seat heats, but not to full sunburn mode. The heat level is adjustable, and the seat positioning controls work as they should throughout a drive (they would stop working after 30sec or so without the K CAN connection).

The blinking lights are not accompanied by a relay click, and they don't blink at regular intervals- it could be 3 sec on, 7 off, or 6 on, 6 off- generally along intervals like these.

Also, the position adjustment is available whether the lights are on or off- it does not seem to be an intermittent K CAN connection. I can tug on the bundle of wires and shift my weight around in the seat without affecting whether the lights are on or off.

Searching leads me to:

1. Battery? it's getting weak, it cranks slower than last year on cold mornings. I do have some bulb warnings that aren't making sense.
2. K CAN wiring sensitivity? I spliced heavier gauge twisted wire between the factory wiring and
I would make sure the CAN wiring is 100%
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      11-18-2022, 04:24 AM   #486
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Has anyone actually been able to get access to a seat wiring diagram? Whenever I click a link I can't find one! Thanks
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      01-25-2023, 11:28 AM   #487
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I wanted to contribute back to this thread as I have found it incredibly useful in retrofitting not only E92, but F32 seats into my E30. Fun fact, for those who don't know, they use the same bolt pattern.

You can replicate the CANBUS signal using a simple 555 timer; this is what others have done, and so have I.
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      02-02-2023, 11:14 AM   #488
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I'm looking to swap powered memory and heated se seats to manual heated m sport seats in my pre lci e91
Would it be plug and play? Any help would be great
Thanks
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      02-26-2023, 01:19 PM   #489
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Hello to all.

Car Bmw e81 2009.

The car had leather manual heated seats from the factory.

I installed electric seats with memory function.
I connected the wires + CAN wires.
Electrical functions work, but Memory buttons do not work, I programmed in Ncs expert $459 in CAS and FRM, but Memory still does not work.

What is very strange is that when $459 is coded into the FRM block, the window opening buttons on the driver's side no longer work.

Could the problem be that the seat modules still need to be programmed?
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      02-28-2023, 02:42 PM   #490
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Hi.

Finally Memory function work, as in forum somebody write that you need code $459 into CAS (correct) and FRM/Nfrm (wrong) modules, when i code $459 into FRM module i lost my window button function in door.

Then i check one more time moules what i have when i add $459 into CAS and yes there are 2 new modules BFS and FAS, thats what you need to code in ncs expert SG-codieren and execute job and FINALLY your memory function work, thats the correct coding now.
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      04-07-2023, 03:05 PM   #491
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Hi guys!
Can anyone tell me if this seat is heated?
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      04-08-2023, 01:20 PM   #492
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Heat Seater Connection

[QUOTE=orest544;30012460]Hi guys!
Can anyone tell me if this seat is heated?


Appears not to be the case. The blue connector running down the center to the back base would have the black connector splitting off, which would be your seat heater connection for the pad in the base.
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Last edited by AuSage; 04-08-2023 at 01:35 PM.. Reason: pic
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      04-08-2023, 02:26 PM   #493
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Question on driver side rear side base riser

I have a driver side seat pulled out and have used the wave signal generator to bypass the can bus:

https://www.amazon.com/dp/B07FBZLD3W...roduct_details

I am planning to patch in a power reducer to reduce the 12v input to 6v output that will feed the signal generator:

https://www.amazon.com/dp/B07HCW46BH...roduct_details

Using this 120v - 12v 10Amp supply:

https://www.amazon.com/dp/B08SM7X4NW...roduct_details

My issue at the moment is that I cannot activate the motor that pivots the rear base of seat up and down and I am unsure why, or even how to trigger the motion from the controls.

Any insight out there?
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      04-08-2023, 02:49 PM   #494
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Update - located control - lift working - how to check/test heated seats

Confirmed that the lift is working, just wasn't pulling up on the control switch properly.

Question - what signals the seat heater on? Unsure how to test/bypass.

Regards
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      04-10-2023, 05:38 AM   #495
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This thread has been very usefull to me but I have a few questions.

My E90-2010 LCI had ONLY lumbar support and nothing else electric.

I purchased M3 fullly loaded seats and also the LCI climate control panel for heated seats.

I was succesfull in installing the seats, got all to motors to work in both seats. I had to install 25A fuse, Installed Ground to pin 8 & 13, steady plus to 7 and 4.

Installed D-Kan wires to pin 2 & 3.

Installed a 2.7 Ohm resistor to the active headrest connector. No air-bag light turned on. The M3 seats did NOT have active headrest even though they are from an LCI.

I would like the heating to work also. What wires are missing?
Do I need wire to pin 9?
Do I need wire to pin 1?
The seats has seat module 6 926 435 01 installed.

As far as I understand I dont need wires in 9 and 1 but only need to code it. Is that right?

What codes do I have to add?
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Last edited by E90_BMW; 04-10-2023 at 05:46 AM..
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      04-16-2023, 01:31 PM   #496
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Airbag wiring issue - Pins order seem different then my original seats!

Hi guys awesome thread thank you very much.

I got 2 electric seats and when i swapped them i found that they were actually E92 seats and i added them to my E90. Everything is working perfect positions, lumbar etc. I grounded two brown wires and had to connect KCAN H and L to get the position working. Added red and black wire to the 30A fuse.

Issue i am having is that as E92 seats dont have a torx screw to hold the seat belt now i need a retro fit to maybe drill the seat belt holder to either the side panel of the car or to the floor. Any ideas if someone has done this?

One more question i am getting seat belt and airbag warning just silent one. If the seat belt is not plugged it beeps but as soon as i plug it in the sounds goes away but the light is there.

For airbag switch i can see that the wiring order is different on the connector can i just swap wiring so yellow is first and brown last so i dont have to swap out the airbags from my original seats?

The lights also came on i think because the yellow plug was unplugged and i started the car to check the seats working?
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      04-24-2023, 11:32 AM   #497
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New owner here. Firstly, what a fantastic thread this is. I've read it top to bottom in an effort to understand what I'm getting into and think I mostly understand it but I have some questions.

Car is 2006 E91. Currently no power or heat to front seats. I've sourced some seats that have heat, power, bolsters, lumbar and memory on the driver side.

I understand that I'm going to need to run power and ground from the fuse box to both sides. And I'll need to tap into the k-can on the driver side, and possibly passenger side.

A few things I'm less clear on.

Power to the passenger side seat heater. Do I need to bring another supply again from the fuse box for this?

I'll install a heated seat switch panel but it sounds like I might need to code the heated seats too. Is that the case and how difficult for a noob to do that? And what kit will I need?

I understand I'm likely to also have to code for memory on key to be active?

I assume this level of coding cannot be done using carista?
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      05-10-2023, 09:53 AM   #498
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Can I swap my non sport electric heated seats for manual heated m sport seats?

Thanks
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      09-19-2023, 10:10 PM   #499
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Quote:
Originally Posted by dasammy View Post
Here are the new plans

One Remark: My seat-heating-modules were powered by Pin9 ... thats a bit strange, because its nowhere in the WDS. Just FYI

First one is drivers side
Second one passenger side
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Thx AoshichanX for your FAQ, but I think thats a little bit too risky for me (or isnt it??). I will let it do someone whos expert in coding. You are not planning to travel to Germany within the next few days ?
Hi Guys. Need some clarification. Mine is E90 LCI standard seat fully electric. Swapped a E90 LCI Sports seat fully electric with additional side bolster.

Obviously the side bolster is not working. Am i correct that i should bridge Pin 4 to Pin7 [12v] as well as Pin 8 to Pin 13 [Ground] on the seat wiring harness? Thats all needed ? Anyone did the same can you please confirm?

Last edited by VickyK; 09-19-2023 at 10:18 PM..
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      09-23-2023, 07:57 PM   #500
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Quote:
Originally Posted by VickyK View Post
Hi Guys. Need some clarification. Mine is E90 LCI standard seat fully electric. Swapped a E90 LCI Sports seat fully electric with additional side bolster.

Obviously the side bolster is not working. Am i correct that i should bridge Pin 4 to Pin7 [12v] as well as Pin 8 to Pin 13 [Ground] on the seat wiring harness? Thats all needed ? Anyone did the same can you please confirm?

Hi
I have just read all the thread.

I am looking to change pre lci heated manual seats to lci partly manual heated sport seats, and what i understood that i only need to give them 12v and ground so i think you should do the same.

If all things go as planned i will do it tomorrow.

Let me know what did you tried and if it worked or not 😁
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      10-15-2023, 07:17 PM   #501
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A very helpful topic. I hope you can help me with a problem
I have an e87 with cloth seats, heating and electric side cushions
I recently switched to electric seats, with memories and heating, but they are from ENGLAND!
I mounted them theoretically plug and play, I connected the kan to the current passenger, the electric works on both, the memories work but the heating does not want to work. The heating buttons are on but nothing, below I attach a picture of the driver's plug and the seat

How can I make the heating work? thank you
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      11-18-2023, 03:04 PM   #502
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Just to add: 06 330i sport seats power heated no lumbar swapped into 09 e91 power heater car no lumbar.

Pass seat worked, plug and play, drivers side everything but bolsters. I had no pin 7 or pin 9 on car side. Jumped both reds together and both browns together seat side and bolsters worked. With out grounds jumped no bolster.
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      11-24-2023, 10:25 AM   #503
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Ive got a question about removing hardware from seats.

Ive got an E92 M3 LCI with full electric seats + memory + heated.

Im going to buy a donor seat so that I can strip out most of the parts in order to keep the powerslider (forward and reverse only) + heating + memory.

This is because I want to use these to fit a bucket seat on the powerslider.

My question is would the memory and heating still work of all the other parts are disconnected?
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      11-24-2023, 05:12 PM   #504
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Hi guys!
I have a non lci E91, with sport seats but i only got the side bolsters (my seat dont have heating). I want to retrofit fully electric and heated seats. Can somebody help me how can i do the retrofit please?
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      11-27-2023, 10:32 AM   #505
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Perhaps usefull for some.
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      11-28-2023, 05:40 PM   #506
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Quote:
Originally Posted by machine4321 View Post
Just to add: 06 330i sport seats power heated no lumbar swapped into 09 e91 power heater car no lumbar.

Pass seat worked, plug and play, drivers side everything but bolsters. I had no pin 7 or pin 9 on car side. Jumped both reds together and both browns together seat side and bolsters worked. With out grounds jumped no bolster.
Awesome. Thanks mate
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