[mike-tomo]

Alright guy was wondering how I make my side bolsters work I have a se bmw that came with manual seats now I have bought some m sport leather seats but I want the side bolster adjuster to work where do I have to run live n earth to?

Thanks in advance mike it's a e90 btw

[mike-tomo]

?

[stevens]

Have you done all the wiring and coding for the memory seats?

[HacKage]

I have just bought some seats to do the exact same. As it's just for the bolsters I think I'll just run it into the cigarette lighter as that will be off the ignition.

If I decide to do the lumbar support as well, I'll buy the proper harness.

[KM79]

Hmm I'm not sure this will work as the seat module needs a Lin Bus signal as well as power and earth to work.I maybe wrong but there's a fair size multiplug on those seats.

[HacKage]

From the DIY found elsewhere on this site, the bolster support don't run through any module.
The wiring for the bolsters under the seat are red/blue and brown iirc, and splicing them with a 12V supply works fine.

As I mentioned earlier, if I eventually upgrade to lumbar support as well, I'll buy both harnesses but as it's is just now, I'll just add power.

[Dsport]

If it's one of the early ones will need a live and earth for passenger seat the airbag and seat occupy are already there
On the drivers it's live and earth with a tracer wire for the memory if I remember correctly its blue and white this is to ignition
I wouldn't run from the cig lighter is run from the fuse box

[Dsport]

May have read this wrong but have you bought electric seats or manual seats with electric bolster

[mike-tomo]

Hi I'm confused haha I have a non electic se e90 and I have put in my sport manual seats with electric adjusble side lumbar and that's what I want to work the little switch on the side to adjust it

[mike-tomo]

The seats I have bought r non electric non memory seats but do have heated and are manual height and movement r adjustable but the side lumbar support is electric that's what I want to work, picture is what is under the seats going to the adjuster switch

[chargingbear]

I am also interested in this as I do not wish to feed a new harness to the fusebox.

[HacKage]

Having a read at this thread http://www.e90post.com/forums/showthread.php?t=229396 it would seem we only have to apply power to the correct cabling and it will work.

I will be trying this over the next day or 2 so will update with results!

[HacKage]

I gave this a bash last night but something isn't right...

On the seat side of the harness, the only power leads I have going in are pin 7 (Red and black striped) for 12V+, and pin 13 (Brown) for 12V-.

I followed the wires up to see what goes where and the brown does not go to the switch, but loops back towards the pump. The red/black lead splits, 1 end up to the switch, and the other to the pump.

On the switch side there are 3 wires obviously to cover the 2 positions on the switch. With 12V+ sourced from the front cigarette lighter plug connected to the red/black of pin 7, the pump is continually on, and is on the "widen" setting. With the back of the set removed and my finger over a small hole on the pump, the seat bolster inflates quite rapidly, but when I remove my finger it then deflates.

I am guessing I will need to have a closer look at the switch and see what goes where. It could be that the pump in my drivers seat is defective so I will test with the passenger seat to see if it acts the same.