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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY: Factory Folding Rear Seats



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DIY: Factory Folding Rear Seats
Published by Bavarian Tech
12-05-2010
DIY: Factory Folding Rear Seats

[b]So your car didnt come with the factory code "465" Split Fold Down Rear Seats - $475
Folding rear seat center armrest with ski bag; Asymmetrical front facing rear seats

Its very possible and realitly easy to retro fit them..Unlike e46 their is no difference between the body with cars and without rear folding seats. BMW was actually nice and provided the holes and brackets needed. Headrest transfer over, this will be 99% factory as cars with factory rear folding can disconnect the middle seat belt so its completly out of the way. I opted not to replaced my seatbelt as it wasnt a big of deal IMO.

Step 1: Your going to need to find a set of folding rear seats. Ideally you want to find a set that match's your existing color/package(Prem for example ). Or if you have money just order them from BMW. I found mine on ebay. Make note you will need the
-Seat Bottom Cushion
-60/40 Rear Folding Seat Back
- Back Seat Side Bolsters


You need to order the following parts from your favorite parts supplier

Seat Back Locks
~Left: 52 20 7 112 863
~Right: 52 20 7 112 864

Seat Back Lock Actuators
~Left: 52 20 7 151 369
~Right: 52 20 7 151 370

Cable Holder ~ 72 11 8 177 700 4x (Not Required, But Opitonal)

Seat Back Lock Actuators Screws ~ 07 11 9 901 299 [4x]

Seat Back Lock Actuators Screw Hole Inserts ~ 63 12 1 374 075 [2x]

Folding Seat Support Bracket ~ 52 20 7 161 259

Folding Seat Support Bracket Screw ~ 07 14 7 161 279



*Factory Two Peice Middle Seat Belt* Totally Up to You
Upper Part ~ 72 11 7 132 245
Lower Part ~ 72 11 9 138 232

Depending on where/how you optain your seats, you may need for following parts (Mine came Included with my seats)

Folding Seat Back End Support Brackets ~ 52 20 7 118 701 [2x]

Folding Seat Back End Support Bracket Torx Bolts ~ 07 14 6 952 304 [2x]


Step 2:

Grasp the seat cushion up on both sides of the car, once you have the seat cushion unclipped just simply remove it from the car. Be careful of a random wiring under the seat.


Step 3:

Once seat cushion is out of the way, you will see two torx 50 bolts in the middle of the seat back right at the bottom of the seat. These bolts were realitely tight on my car. Dont use an allen key or anything like that make sure its a proper torx bit as the bolts are going to be reused.


Step 4:
Open your trunk and wiggle in their on your back and look around their will be two lock looking things, you need to take a flat head screw driver and make the lock module move It has to spin around...(just mess around with it, and you'll figure it out) You n







Step 5:
Once you have disconnected the seat back from the lock, proceeed to remove it from the car, It helps having two people its not heavy..just awkward size..




Heres a picture I found for reference if your having a difficult time removing
Quote:
Step 6:
You'll want to remove the non-folding seat back locks. Their are two 13mm bolts on each side. Dont misplace the bolts, as you will be using them again to put in the New Folding Back Seat Locks.






Step 7:

Push the Expanding nuts into the apprioate holes in the roof of the trunk. Their are three holes MAKE Sure you dont put them in the middle as these are extremely hard to get out once inserted




Step 8:
Line up the handles and give them a good press into the the body of the car.



Remember those expanding nuts you pressed into the body,now you can use four screws and insert them and tighten up the handles. Dont go crazy,as these are only plastic just make sure their snug.


Step 9:
Fish the Actulor cable thru the hole and into the lock module area. The sound damping foam is already cut for the cable.


Now Fit the folding lock modules, Rember those 13mm now reuse them. Dont forget to connect the cable to the lock module its press fitted in. Tighten up the lock modules..


Bolted in


Don't forget to snap the actuator cable into the holders, saying that you ordered them not necessary just completes the retrofit more.





Step 10:

Take the support bracket and associated screws needed and bolt it into the Bracket on the body of car. The support Bracket slides in between the Bracket from the car. The bolts go in with the head of the Bolt facing the passenger side of the car.



Support Bracket ^



Bracket on Body of Car ^

I forgot to take a picture of them the two pieces together.


Step 11:

Take the left side of the Folding rear seat back (The smaller one) side it thru the big hole of the support Bracket, Now take the bigger side and connect the the back seats together..Now bolt them to the factory hole at the ends, using the bolts removed from the Non-folding rear seat back.

Take you time as this part of the install can be a bit tricky


Step 12:

Swing the seat back into place, check the lock function. Grab the side blosters and clip the plastic clip into the square hole in the body of the car.


Snap the side blosters into place, just line them up and give them a good smack into place..

Take the seat cushion and depending what you did with the seatbelt siutiuatino. I left mine as is, line up the cushinon with the front spring loaded clips and smack it down till it held in place.

Step 13:

Now enjoy you folding rear seats


-Parts $ 125 shipped
-Seats $200

Since I don't ski or plan to anytime, I decided to skip the ski bag in favor of Barvain Technic Cable


__________________
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  #1  
By I335 on 12-05-2010, 04:39 PM
Great write up & contribution! I love my folding rear seats - makes a huge difference in overall utility. It also makes it a lot easier to clean the inside of the back window because you can fold the seats down and sit on them...
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  #2  
By AlanAZ on 12-05-2010, 11:02 PM
Holy cr*p! I didn't think that was possible. Might be my next project after the Performance Suspension goes in.

Nice job.
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  #3  
By powerbarsk8ter on 12-12-2010, 08:45 AM
This is very stealthy, compared to a ski holder (160) and base(200) on the top of car.
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  #4  
By fherjohn on 12-12-2010, 10:15 AM
Excellent
Diy
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  #5  
By Bavarian Tech on 12-12-2010, 01:31 PM
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Quote:
Originally Posted by hamilton_wong View Post
Wow, didnt know this was possible either. So the seats were only $200? Did you get them from the dealer or a used set?
I got em off Ebay removed from an 08 wrecker with 5k
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  #6  
By evoiii90 on 12-22-2010, 06:18 PM
I just got a E90 08 M3 and was wondering if this could be done or not since my car came without folding seats. Now I know that it CAN be done !!!

Thanks so much !!! folding seats, here I come.... now I just need to find some light grey back folding seats...
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  #7  
By Evil E90 on 12-22-2010, 10:49 PM
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Nice write up. I noticed you put down $200 for seats. Does that mean i cannot use the non folding seats I have now and just add the hardware?
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  #8  
By 1 AKY on 12-28-2010, 06:46 PM
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Quote:
Originally Posted by evilpixel View Post
Nice write up. I noticed you put down $200 for seats. Does that mean i cannot use the non folding seats I have now and just add the hardware?
Good question, i.e. have folding but not split rear seats.....any answers?
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  #9  
By Bavarian Tech on 12-28-2010, 08:50 PM
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Quote:
Originally Posted by evilpixel View Post
Nice write up. I noticed you put down $200 for seats. Does that mean i cannot use the non folding seats I have now and just add the hardware?

You have to Buy or find a set of folding seats no other way around it.
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  #10  
By sattapaal on 01-11-2011, 07:40 PM
cant find these seats anywhere!
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  #11  
By Bavarian Tech on 01-12-2011, 09:18 PM
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Quote:
Originally Posted by sattapaal View Post
cant find these seats anywhere!

Just keep your eyes open..Took me a couple of months to find Black Premium seats
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  #12  
By RandallRaines on 01-13-2011, 06:59 PM
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Hi,

Didn't do the mod yet so don't mind the ratings.
I didn't check my car yet, but isn't there a back metal plate when you don't have the folding seats ? Or it's just embedded with the seats ?
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  #13  
By Bavarian Tech on 01-14-2011, 12:01 AM
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Quote:
Originally Posted by RandallRaines View Post
Hi,

Didn't do the mod yet so don't mind the ratings.
I didn't check my car yet, but isn't there a back metal plate when you don't have the folding seats ? Or it's just embedded with the seats ?
Unlike the e46 their is no structure difference between cars equipped with folding rear seats or not...When you remove the non-folding seat theirs no metal backing
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  #14  
By RandallRaines on 01-14-2011, 07:39 AM
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Quote:
Originally Posted by msbc721 View Post
Unlike the e46 their is no structure difference between cars equipped with folding rear seats or not...When you remove the non-folding seat theirs no metal backing
Thx for the info.
Would you have the part number for the folding back seats by any chance ?
Thx

ps : looking for a DIY for electric folding mirrors if anyone made it.
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  #15  
By Bavarian Tech on 01-14-2011, 08:24 PM
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Seat carrier, rear 1x 52207133818 $48.24
Foam section, seat 1x 52207133822 $207.89
FOAM PLASTIC PART LEFT BACKREST 1x 52207151645 $125.76
Foam section, backrest, right 1x 52207151646 $80.03
SEAT COVER LEATHER SCHWARZ 1x 52207146944 $957.97
COVER BACKREST LEATHER LEFT SCHWARZ 1x 52209119136 $506.15
COVER BACKREST LEATHER RIGHT SCHWARZ 1x 52207146956 $429.66
LATERAL TRIM PANEL LEFT SCHWARZ 1x 52207162499 $272.55
LATERAL TRIM PANEL RIGHT SCHWARZ 1x 52207162500 $272.55
Cover isofix SCHWARZ 4x 52207118674 $13.83
Frame, backrest left 1x 52207141907 $341.01
Frame, backrest right 1x 52207146973 $227.34
Lock left 1x 52207112863 $35.49
Lock right 1x 52207112864 $35.49
Cable holder 4x 72118177700 $0.52
Hex head screw ST4,8X16-ZNS3 4x 07119901299 $0.25
Expanding nut ST 4.8 4x 63121374075 $0.23
Support 2x 52207118701 $7.87
Bush 2x 52207134124 $7.75
Torx bolt ISA M6X28 2x 07146952304 $5.62
Supporting bracket, center 1x 52207161259 $6.30
Fillister head screw with collar M10X15 2x 07147161279 $0.80
Trim backrest, left 1x 52207163500 $103.39
Trim backrest, right 1x 52207163501 $57.39


Thats over $1,800 , that doesnt include the ski bag or the rear armrest.
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  #16  
By RandallRaines on 01-15-2011, 03:45 AM
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Wow that's a lot ! I'll wait until i can find the seats cheaper somewhere.
I'm still chocked that bmw didn't put that stock, that's just greedy...
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  #17  
By tracerit on 01-30-2011, 06:46 PM
what's the difference between Premium and non-Premium seats?
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  #18  
By Bavarian Tech on 01-30-2011, 08:57 PM
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Premium Package cars seats have Real leather

Non Premium package car have leatherette
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  #19  
By Tk502 on 04-15-2011, 03:02 PM
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Very nice diy. I recently pruchased a '09 335i e90 without the foldable seats. After seeing this post I'm gonna try and tackle this project. Woodpecka are your seats still available? Thanks
Chris
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  #20  
By Tk502 on 04-18-2011, 08:35 PM
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Thanks for the reply woodpecka. Bare with me here: looking at the schematics you attached I'd have to get the actual covers? I'm assuming your side bolsters and bottom seat are also for the e91. How much are you asking and do you have any more pics? ALso do you know how they attached the covers over the foam?
Chris
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  #21  
By jvxbimmer on 04-20-2011, 12:44 AM
Great job
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