Sport Seat Retrofit Problem

Polaris15 · 08-16-2019, 10:09 AM

Hello all, I’ve searched high and low for answers and tested many things and come up short. Here’s what I’m up to.

I have an LCI e91 that came equipped with non leather, non heated, comfort seats. I’m swapping in pre-lci sport seats from a 335i. New seats are heated, power lumbar etc.

I swapped in the drivers with no issue and the functions of forward, back, up and down plus tilt work as they should. This is all I wanted for now as I will need to do additional wiring for the remaining functions. Moving over to the passenger side.... installed, followed same procedure, plugged everything in and NOTHING.

I have power to the seat and no fuses are blown (multi meter tested). I swapped the controls from old seat to new and got nothing.plugged back in old seat and it works as it should. I’m at a loss, need some help. Anyone run into anything like this?

I did trip the airbag light in all of my frustration as I was sick of hooking and in hooking the battery. I’ll deal with that later.

86rexer · 08-20-2019, 07:09 AM

You'll have to check the pin locations on the passenger seat. While all the correct wires will be there, they may be in the wrong connector location. Somewhere during the model years BMW switched the pins.
I did the same type of swap for my seats and needed a schematic to make sure they lined up correctly.

https://www.e90post.com/forums/showthread.php?t=1321735

smallseafishie · 08-20-2019, 07:16 AM

There's 2 sets of power pins on the harness for sport / electric / heated seats. If your previous seats were manual and not heated, you'll need to run a power wire from the junction box. If your previous seats were either heated or power, you'll have one of the 2 sets of power pins. Just bridge the missing power pins over.

LCI seats have active head restraints where as pre-LCI does not. That's probably why your airbag lights are on. I believe you can code them out.

08-16-2019, 10:09 AM	#1
Polaris15 New Member 11 Rep 21 Posts Drives: 89' 535i, 99' M3, 09 e91 6spd Join Date: Jan 2017 Location: Swampscott iTrader: (0)	Sport Seat Retrofit Problem Hello all, I’ve searched high and low for answers and tested many things and come up short. Here’s what I’m up to. I have an LCI e91 that came equipped with non leather, non heated, comfort seats. I’m swapping in pre-lci sport seats from a 335i. New seats are heated, power lumbar etc. I swapped in the drivers with no issue and the functions of forward, back, up and down plus tilt work as they should. This is all I wanted for now as I will need to do additional wiring for the remaining functions. Moving over to the passenger side.... installed, followed same procedure, plugged everything in and NOTHING. I have power to the seat and no fuses are blown (multi meter tested). I swapped the controls from old seat to new and got nothing.plugged back in old seat and it works as it should. I’m at a loss, need some help. Anyone run into anything like this? I did trip the airbag light in all of my frustration as I was sick of hooking and in hooking the battery. I’ll deal with that later.
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08-20-2019, 07:09 AM	#2
86rexer 0-335 in 4.9 seconds..... 18 Rep 125 Posts Drives: 2008 335i E90 Join Date: Feb 2011 Location: Oakville, Ontario iTrader: (0)	Retrofit problem You'll have to check the pin locations on the passenger seat. While all the correct wires will be there, they may be in the wrong connector location. Somewhere during the model years BMW switched the pins. I did the same type of swap for my seats and needed a schematic to make sure they lined up correctly. https://www.e90post.com/forums/showthread.php?t=1321735
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08-20-2019, 07:16 AM	#3
smallseafishie Colonel 110 Rep 2,017 Posts Drives: AW 07 e92 335i + AW 11 X5 35d Join Date: Jun 2007 Location: Atlanta GA iTrader: (13) Garage List 2007 E92 335i [0.00]	There's 2 sets of power pins on the harness for sport / electric / heated seats. If your previous seats were manual and not heated, you'll need to run a power wire from the junction box. If your previous seats were either heated or power, you'll have one of the 2 sets of power pins. Just bridge the missing power pins over. LCI seats have active head restraints where as pre-LCI does not. That's probably why your airbag lights are on. I believe you can code them out.
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