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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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      02-19-2018, 02:41 PM   #331
r8ede30
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retrofitting seats

Quote:
Originally Posted by ss4drhotrod View Post
I am still pursuing an alternative to the K_Can issue. I am still trying to find out what amperage the K_Can carries. Since pin 2 (+) and pin 3 (-) are about 18 gauge wire, i am assuming amperage would be at the 1 to 2 amp range.

I found a solid state voltage reducer (to 5V) at 2 amps and will try it out.

When i have run a few tests i will update the post.
I have a pair of E93 seats from a 2011 m3. powered and heated.
I have installed them into my e30. they are behaving just like yours.
I have a relay installed to power them off a switch but the motors only operate for a short time. I also believe the 5v to canbus (2,3 pin) could be a solution. have you tried this yet. i'm about ready to try it but also don't want to fry the seats
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      06-28-2018, 12:52 PM   #332
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Super helpful thread indeed, even 7 years after it was created.

I'm also in a situation where I have a pair of e92 sport seats that I am trying to install in an earlier model ('73 3.0cs) that does not have a K-can Bus. It looks like a few people in the last few posts have been trying to find out how to make this work but I did not see any successful solution.

Seems to me there are 5 options:

1. Simplest option is to find a way to get it to work at least once and set all controls to the way you want and then just hope you never want to change them.

2. Find a way to make the seat computer think there is a BUS attached, apparently by sending 5v + to pin 2 and - to pin3. Has anyone actually done this?

3. Get a K-can bus from a parts car and somehow hook it up in the car. (Is that even possible?)

4. Re-wire the seat to bypass the seat computer and send power directly to the control switches

5. Remove the electrical controls and convert everything to manual. Not sure if this is possible either.

Has anyone tried any of these successfully?

Thank you.
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      06-28-2018, 04:33 PM   #333
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5 variant is real, you'll need to get manual seat frames from e92 coupe
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      06-28-2018, 06:19 PM   #334
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Quote:
Originally Posted by ptpending View Post
5 variant is real, you'll need to get manual seat frames from e92 coupe
Thanks pt, good point.

Thinking more about it, two things that would need to be kept electric are the side bolsters (pump I believe) and lumbar adjustment (I don't think there is a manual equivalent for that, is there?).
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      06-29-2018, 12:39 AM   #335
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yep, these functions do not require car CAN bus
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      06-29-2018, 12:41 PM   #336
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Quote:
Originally Posted by ptpending View Post
yep, these functions do not require car CAN bus
Interesting! I will hook up a battery to it this weekend and test that.

BTW, we know that when hooking power to the seat without the bus, the adjustments will work only once and then stop working. But it appears that "after a while", this seems to get reset and you get a new "one shot" opportunity. Does anyone know what triggers this "reset"? Is it after the power has been off for 24 hours or something to that effect?
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      06-30-2018, 12:04 AM   #337
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Quote:
Originally Posted by Bmachine View Post
Super helpful thread indeed, even 7 years after it was created.
I'm happy to see it being still useful.
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      06-30-2018, 02:53 PM   #338
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Quote:
Originally Posted by woodpecka View Post
I'm happy to see it being still useful.
Thank you to you Woodpecka and dasammy for starting it and making it so interesting!
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      07-03-2018, 01:27 PM   #339
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Thumbs up

woodpecka & dasammy,

I'd just like to say thank you very much for this thread, it's been extremely helpful for my retrofit. Mine isn't an e90 but an e89 Z4. Loads of cross-over information and the rest with the aid of the official workshop manual.

I've gone from manual heated standard seats to electric memory heated standard seats. Decided not to bother with the sports seats as I'm very happy with the standard and here in the UK you're really lucky if you can find a pair for less than 1000, and that's if you can even find the right colour, so I stumbled upon these ones in the same colour as mine.
All fitted up with a new CAN bus line to the back of the radio, coded into the VO and the .MAN file and apart from an initial point where it didn't work once I'd cleared the fault codes it is working perfectly with memory.

So once again thank you very much to the both of you for all of your hard work
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      07-04-2018, 10:52 PM   #340
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you guys rock, this is not an easy mod!
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      07-12-2018, 08:17 PM   #341
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Quote:
Originally Posted by ptpending View Post
yep, these functions do not require car CAN bus
I can indeed confirm that the power to the lumbar and side bolsters bypass the seat computer and go directly to the pump. Excellent. One less thing to worry about.

It is also relatively simple to take the "Base frame" frame (which includes the rails and the fore and aft motor assembly) out and replace that with the same from a manual seat. So at least you can adjust the seat fore and aft manually. What is left then is the seat back adjustment and the seat height and angle.

Has anyone figured out if there is a way to pass the computer for those controls?

Thank you.

Last edited by Bmachine; 07-12-2018 at 08:22 PM.
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      07-12-2018, 08:56 PM   #342
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In case this is helpful to anyone:

1. Difference in manual vs electric seat base
2. Plug assignment going into seat computer
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Last edited by Bmachine; 07-13-2018 at 01:24 PM.
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      07-13-2018, 01:00 AM   #343
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if you replace base frame (without backrest) everything will be adjusted mechanically
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      07-13-2018, 03:11 PM   #344
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Quote:
Originally Posted by ptpending View Post
if you replace base frame (without backrest) everything will be adjusted mechanically
Thanks PT. This does sound like a possible option indeed. But with a few challenges.

1. Separate the bottom from the back for each seat.
2. Remove the "soft" part (cushion, leather and, on the sport seat, the front section that pulls forward) from the base of each seat and install the sport seat soft part onto the manual seat "hard"/metal base section.
3. Reassemble this manual seat bottom with the electric seat back.
4. Figure out how to move the electric controls for the lumbar and side bolsters on the manual seat bottom
5. Realize you do not have the seat base angle adjustment available anymore.

I have not done it yet but, at first glance, it does not seem trivial.
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      07-14-2018, 02:37 AM   #345
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if you buy sport seat baseframes you will not lose base angle adjustment
lumbar and side bolsters wiring have no differences
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