[Ekrin]

I have pulled a lot of information from this old thread. Didn’t want to bring an old post back from the grave tho, most forums don’t like that. And other posts have different seats and info on wiring it all up completely, which I don’t need to do. So I’m stumped a bit.

https://www.e90post.com/forums/showthread.php?t=1634953

smass are you still active and remember something 6 years ago?

My questions are marked with “Q:”
I have a 2011 BMW 335i xDrive e90, 6MT
Seats: Power sport seats: memory, (forward and backward on the rail power, up and down power), side bolsters, manual leg extension.

2007 BMW Unknown
Seats: Power Heated (sport seats?): memory (forward and backward on the rail power, up and down power), side bolsters, manual leg extension, lumbar, heat.

(I switched out tensioners from my seats to these heated seats as I couldn’t get that code to clear and that cleared the code)

Plug and play with driver side. It works.

——————

Passenger side is the tricky part on e90’s as I found out. I need clarification, please. Wiring.

As Smass has said on that linked forum post, I am missing 2 thin and 2 fat wires on the bigger rectangular connector of the yellow harness for the passenger side.

A thin Blue with Purple that is Pin 1
That will need a small female pin for car side
(I went to a junkyard and unpinned this exact wire and got it for free and am now just gonna crimp in a female/male regular conenctor to it and run a lomger wire somewhere)


A thin Red with Green that is Pin 5
That will need a small female pin for car side
(I went to a junkyard and unpinned this exact wire and got it for free and am now just gonna crimp in a female/male regular conenctor to it and run a lomger wire somewhere)


A fat all Brown that is Pin 8
(Don’t worry about the need to pin this one, just splice it into the smaller all Brown Pin 13 to get ground)

A fat all Red that is Pin 9
(Also don’t worry about the need to pin this one on car side, just splice it into the fat all Red Pin 4 to get power on seat side)

That takes care of my 2 fat wires.

The thin Blue with Purple in Pin 1, also known as C4
Q: Where should I tie that into, where does it go?

The thin Red with Green in Pin 5, also known as C3
Q: Where should I tie that into, where does it go?

Q: And after this wiring, I still have to code the $494 into the CAS and FRM? I don’t even know what program or website I can use for that. I saw another theead give direct directions I can follow tho. I have ProTool, and Carly. Can they do the coding?

[Ekrin]

Here’s the pic of the wires I am missing. Exactly as outline in that post that was linked.

[3PedalJake]

Subscribed to your thread. I'm also beginning a seat retrofit and as you mentioned every post seems to be for a different use case. My retro is-
Current: Leatherette sport seat, heat, power lumbar, manual base
New: Leather sport seat, heat, power lumbar, memory, power base

I've got as far as taking pics of the connectors, trying to figure out what all the wires do and which are missing/wrong on my current setup.

[Ekrin]

Originally Posted by 3PedalJake

I've got as far as taking pics of the connectors, trying to figure out what all the wires do and which are missing/wrong on my current setup.

I saw some errors in my post so I corrected them. Also tried to write down what I was missing wire wise to see if something tells me where they go but I’m officially stumped. Cannot for the life of me figure out where these wires go

A thin Blue with Purple that is Pin 1 (aka C4)
“PWM-Signal”

A thin Red with Green that is Pin 5 (aka C3)
“Terminal 15” —- Is Terminal 15 fuse 15?

We have to make pins in the csr side of the harness and run those wires where???

I have tried looking into the retrofit posts and it just stops. The seats have those wires, the car does not. I am told those wires are what the junction box needs to tell the seat to turn on so it should have to go to the JBE with a fuse but cannot find anything on them.