My BMW E90 seat install

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

Joined
Jan 17, 2005
Threads
244
Messages
7,604
Location
Southern Colorado
Well, enough on all the E46 seat threads - here's how it works with the slightly newer seats from '06-'13 3 series BMWs.

A few points: seems like E46 seats are quite pricey and in short supply in the Denver area - $600/pr from resellers, typically only in black. eBay pricing not much different, plus shipping.

I found a pair of black seats on Craigslist that were claimed to be E46 - but the production date was Aug. '05, which puts them as '06 seats and therefore, E90. A kid bought them for his Jeep and never installed them, so they sat in storage for 6 years, which means 6 years less wear. They are leather, power, not heated. They have side air bags, which I ignored. The missing corner trim piece (small) is $36 at the dealer.

I ordered the Torfab brackets, which are of the high quality and good execution raved about here - nicely done! As for the photos below, the seats came with the yellow wiring connector, which I took apart to reveal two fat power wires and two fat ground wires, all of which must be connected. Other wires I presume are for airbags, since I don't see any that appear to be for a heater.

The E90 seats have the 'timeout' feature where the power cuts off (to all but the lumbar support) after 15 minutes, so you have to turn off seat power and re-power them to get them to move. A pain. So, I added a power switch from Radio Shack to the front corner of the seat to allow this. I rarely adjust the seat, so I leave the power off and just power up the seat when needed and then turn back off.

The seats do have a wonderful range of adjustment, more fore-and-aft than factory. The headrest is more pronounced and is more 'in your face' (or more like 'in the back of your head') than the OEM ones.

So, yes - my seats don't match my interior color, and the wiring was a minor pain. Not sure if I will install the passenger seat or not.

I also removed the leg-cramping OEM FJ-62 'dead pedal' and replaced it with an inch-thick rubber block. Now, I have the same legroom I had in my '87 FJ60 - just the way I like it.

DSCN7290.webp


DSCN7365.webp


DSCN7371.webp


DSCN7386.webp


DSCN7389.webp
 
2006 BMW 3 series coupe and convertible were still E46s, those look like E46 seats.

EDIT: Actually the seats from the 2 different models look very similar, but wanted to point out that just because they are 06, doesn't mean they are E90.
 
Last edited:
DFXR - not sure I saw 'ahh' - they aren't recliner-comfortable, but I don't find myself squirming to find any comfortable position, as I had. Still getting used to how they feel. They should be great offroad, and on longer trips, with the height-adjustable lumbar.

89CruiserFJ62 - The nice lady at BMW (their parts counter is covered in genuine walnut!) determined that they were E90, based on the availability of the cover plate that I am missing. The side panels are not E46-style. The seat backs of mine look quite different than other E46s, and I saw a BMW 135 convertible in the showroom (2013 model year) that had these same hinge cover pieces. Search SiteSearch 52107140507 - 52107140507 - COVER, BELT CATCH
 
They look identical to mine other than the color, I didnt check what mine came out of at the P&P, just the best set the yard had. for $35 each
Mine does not power out, Just a hot and a ground, I did it simple so I can adjust without the key.
11045496_10208379909242465_15836067110267183_n.jpg
 
Yup, definitely not Lazy-Boy comfy (that might get weird after a while anyway). What you're saying about off road and longer trips is true. I have much older manual BMW seats but I do think the basic design is similar. Even with the lesser bolsters (mine are "comfort" rather than "sport") the seats kinda grab and hold you, and the firmness feels good. Made for driving, not relaxing, if that makes sense.
 
Geez - to find tan seats for $35 at the pick and pull! Looks nice!
 
I could never find anything that looked like heater wires - only dangerous-looking airbag wires - so I left them alone. There's very little E90 seat information online about heater wiring that I could find.
 
Neat - great info. I had never seen that. There are other threads here on Mud that talk about connecting a BMW heated seat switch to the BMW seats, and it's not simply a case of hooking up positive and ground. There's a feedback wire. I'd have to spend some time seeing if my seats really are heated, based on the wiring diagram you provided - I'm still not sure they are. Thanks!
 
Great thread with lots of great info on the BMW seats. I recently installed 09 3-series Sport seats in my 70 series LC. Love the seats, now working on getting them powered up. Appreciate the information and link to the e90 site for the wiring. Also great idea on the seat power switch as the timeout can be a pain. I'll be back with questions once I start wiring things up.

I made my own mounting brackets...
4E1CE52C-F48F-425D-A6FF-897BCFC14359_zpsklketeps.jpg
 
Has anyone worked out the functions of the heaters on e90 seats?
My guess is they cycle to control the heat level, as there are only two wires to the elements. If I'm right, merely hooking them up to a switch would fry my ass.
I found a set of mint manual seats with heaters, pretty much my dream setup for a crappy old 60.
 
Last edited:
No. With leather seats, just wait until summer, and you'll be hot and sweaty ;-). I still would like to find a pair of earlier tan seats and wire them all up - perhaps someday.
 
Yea. Mine are black. As soon as I find tan I'll be tossing these.

The elements are a resistor. I'll talk to my engineer and see if I can just hook up a 12v DC fan control. It would neat to use the FJ60 dash light potentiometer, but the elements call for a 30a fuse on the wiring diagram. Pvssst'poof.
 
Ok, my engineer suggested the 2 wires are 2 sets of of elements for 3 levels of heating and they ground through the sea chassis.

I'll just hook a battery up while they are out and see if I can control the heat that way. I already have 30a relays available in a couple Bussmann boxes I installed for extra stupid stuff, so I'll be set if this works.
 
My understanding is that the seat heat switch from a BMW E36/46 will control the heat in stages properly. It also fits nicely in the coin holders of the stock console.

I doubt those are 30a switches, they likely go to a relay on a separate seat harness under the dash. they are cheap enough on ebay to pick up a set and tinker with.
 
I doubt those are 30a switches, they likely go to a relay on a separate seat harness under the dash. they are cheap enough on ebay to pick up a set and tinker with.
The BMW seat mats do not draw 30amps. Maybe 5-10 based on what I have read on the BMW forums. So OEM BMW switches will control the OEM BMW seat heat mats. However, aftermarket mats do use more power and I would not advise using the BMW switches with them. Also, the BMW switches do not trigger a relay to power the mats. The switches utilize a duty cycle function which means constant on-off power switching. This would quickly kill a standard relay if the switch was set up to trigger the relay to power the mats. So it is suggested that (and based of OEM BMW wiring diagrams) that the power go directly through the switches to the heat mats.
 
Back
Top Bottom