Cannot figure out wiring to retrofit sport seats e90

ee90 · 12-15-2022, 03:39 PM

My car came with the normal memory, heated and electric adjustable seats with absolutely no lumbar or side bolster adjustments.

I picked up some seats with the bolster and and lumbar. Everything that is meant to work is working other than the lumbar and bolster buttons. Which I expected, today I pulled the seat out to take a look at the wiring as this seems to be a common issue on these seats but to my surprise the floor connector that connects into the seat has no wiring for the bolster at all, my car is a 2008 model so I looked in pin 7 and pin 9 but nothing.

Now on the seats however there is a black and red wire in pin 7 that you are suppose to splice and it works. But since my floor connector doesn’t have anything what am I meant to do?

I attached images of both connectors. Is there anything I can do or am I stuck?

Serf27 · 12-23-2022, 01:09 PM

I think you need 2 spare pins to add to your harness on the car and then splice then into your existing red and brown wires.

12-15-2022, 03:39 PM	#1
ee90 Private First Class 37 Rep 158 Posts Drives: E90 M3, E90 335i, E39 530i Join Date: May 2022 Location: ON iTrader: (0)	My car came with the normal memory, heated and electric adjustable seats with absolutely no lumbar or side bolster adjustments. I picked up some seats with the bolster and and lumbar. Everything that is meant to work is working other than the lumbar and bolster buttons. Which I expected, today I pulled the seat out to take a look at the wiring as this seems to be a common issue on these seats but to my surprise the floor connector that connects into the seat has no wiring for the bolster at all, my car is a 2008 model so I looked in pin 7 and pin 9 but nothing. Now on the seats however there is a black and red wire in pin 7 that you are suppose to splice and it works. But since my floor connector doesn’t have anything what am I meant to do? I attached images of both connectors. Is there anything I can do or am I stuck? Attached Images
	Appreciate 0 Tweet Quote

12-23-2022, 01:09 PM	#2
Serf27 Brigadier General 2881 Rep 4,333 Posts Drives: 335i Join Date: Apr 2018 Location: Sitting in a BMW. iTrader: (-1)	I think you need 2 spare pins to add to your harness on the car and then splice then into your existing red and brown wires. __________________ E90 335i-408WHP. Alpine over Terra brown E70 X5 35i M Sport-Stage1 Tune. Alpine over Black E91 328 M Sport-Alpine over Black-Alpine over Saddle brown. E93 335i-DINAN tuned. Alpine over Saddle brown
	Appreciate 0 Quote