The Complete DIY for Twisted Seat Repair! - BMW M5 Forum and M6 Forums

Go Back   BMW M5 Forum and M6 Forums > BMW M5, M5 Touring, M6 and Z8 Forums > E39 M5 and E52 Z8 Discussion

E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

Like Tree9Likes

Reply
 
LinkBack Thread Tools Rating: Thread Rating: 1 votes, 4.00 average. Display Modes
Old 24th June 2010, 19:31   #1
doc$holliday
Fellow Member (>400)
 
doc$holliday's Avatar
 
Join Date: Feb 2008
Location: Fort Lauderdale, FL
Age: 38

Garage: 2003 M5 Le Mans Blue

Sales Feedback: (2)

Thanks: 109
Thanked 134 Times in 42 Posts
The Complete DIY for Twisted Seat Repair!

Okay, so I learned two things the hard way recently: First, if you are going to do the twisted seat repair, do everything possible to get it right the FIRST time because repeating all this 3x is a major PITA. Second, if you are going to do a writeup about it, do it in Word and then copy it into the thread...because if your computer reboots, you lose everything you typed. Ugh.

Enough about all that. I know I took a LOT more photos but I'm having trouble locating some of them now, so I will just have to go with what I've got here. I'm going to go through this procedure as it pertained to me, which is to say that I had to do the full Monty on this repair. There are several places where you may get lucky and not have to do all these steps. Let's just say that a simple "look under the seat, heat up the black wire and pull it out" fix did NOT work for me.

A note about airbags (SRS): I had no issues with this. Make sure you leave the key in the house or whatever and do NOT insert it at any time when your seat is unplugged. Follow that and you'll be fine. Also note that the power seats and such only operate for a certain amount of time, say 15-20 mins, when a door is initially opened and there are no keys in the ignition. So if at any point you are wondering "why don't my seat controls work?", it could be that your doors have been open for too long, just shut them, reopen and resume.

What you will most likely need: A socket wrench and assorted size sockets, a smaller flat-blade screwdriver, various pliers, possibly a cordless drill, an 8mm box wrench (one that ratchets if you have it!), a plastic level, something to heat with (I prefer a small handheld butane torch from Home Depot, works absolutely perfectly for $15 or whatever and looks like a small gun), razor knife, someplace clean to set your seat, and probably a helper elf to pull this heavy-@ss seat out of the Beast.

Summary of the issue: the reason your seat is twisting (half of it is raising, or tilting back, or whatever) is because all of the motions that are available are controlled by motors underneath. Each silver motor has two black cables running into it (one on each side) and each cable does half the seat. Inside the black, plasticky insulation is actually a mechanical cable with ridges in it. Something inside the motor clamps onto those ridges and physically spins the cable (inside the black insulation), creating a winding motion and moving the seat. One of your motors has lost half of its spinning, which means the mechanical cable has become "disconnected". What you are looking to do now is to pull that cable out, cut back the insulation to allow more of the cable to push into the motor, and reinsert so that the motor spins both halves of the seat together again. Sounds easy, right??

First, try to manipulate the controls of the seat such that everything is in "normal" position. In other words, the seat bottom and seat back are level. Sure, they may not be where you want them (since you were trying to move the seat in the first place, right?) but just get them level.

Step 1: Seat Removal - Raise the seat vertically to allow easier access to removing it. If you have never removed your seat before, you need to take out the metal stopper piece in the seat track behind the driver's seat. Ignore this if you are working on your passenger seat. The stopper is in the right side track, here is a pic:


Now you can move the seat all the way back to access the bolts in the front. There are two in the front and two in the back, all size 13mm or whatever it is. The ones in the back are protected, pull aside the plastic like this:


While you are underneath there, you need to disconnect the seat belt. Here is a photo of the bolt you need to remove, after which the belt will pull up through the plastic trim and separate from the seat (it stays hanging in the car):


Now, in the same area (lower left behind seat, for the driver side) you need to remove the seat belt tensioner pin. It's sort of like a cotter-pin, you'll figure it out. This thing is what keeps tension on the seatbelt as the seat moves forward and back. Here's a closesup:


Okay, there is only one more thing to do in order to get the seat out of the car (or, if you are feeling lucky and want to attempt it, you can try to do the repair while your seat is merely laying all the way back so you can access underneath it while working in the footwell area. Personally, I don't recommend it. Anyhow, the one thing is to disconnect the power cable to the seat. This will erase your memory seat settings, as they are kept in the seat, not in the buttons on the door. Here is a picture of the cable:



Before you pull this cable out and disconnect seat power, let me say this: you really prefer to have the seat raised to max vertical height before taking it from the car. It will make your work on the motors easier. Also, it may be good to tilt the seat back and disconnect a motor or two to figure out which one operates the seat function that is messed up. Do this now before you pull power and take the seat out.

Step 2: Motors and cables
I def wish I had those other pics, they were much better at showing the entire bottom side of the seat. If I find them later, I'll edit this thread. Anyways, now you have the seat out and flipped upside down. You need to know which motor of the 3 is controlling the seat function that is twisting up. I'm running out of time for now so I'll assume you found out which one it is. Here is a pic, there are two motors in this one: one is middle right side, between the two large black support bars and the other is in the upper right corner. You can see the black cable going into it pretty clearly.

Each motor has 4 screws, they are 8mm I think. They will be very difficult to get at, in some cases. Those screws HAVE to be loosened at least somewhat in order to pull the black cable (with metal tip) out of the motor. Having those 4 screws tightened down is what locks the cable into the motor. You will need to bend some of the seat's metal tabs out of the way to access some screws, you'll see what I mean. The alternative is that if you want to try to heat up the black cable near the motor, and pull it out to work on it while leaving the metal tip embedded in the motor, you can try. It's going to be difficult but some people got lucky with that, aka anyone that was able to just get under their seat, heat it up with a lighter and do the repair. Good luck with that.

Here is a photo where I have bent a tab, removed some screws and pulled out the cable:


Here is what the cable looks like:


You need about a half inch of the metal ridged cable exposed in order for the motor to grip it properly. Once you find yours, odds are that it's shortened to about 1/4" or less exposed. Use your heat source to heat up the metal tip and pliers to pull it up and off the black insulation. Yes, this can be a real PITA. Keep at it. Trust me, that butane torch is awesome for this. Use a razor knife to cut away the black insulation to get the proper amount exposed. Then you have to heat it up again and reattach the metal tip. Once it's ready, plug it back in the motor and reassemble whatever you took apart.

In theory, that should do it and you should be able to reverse all this to complete the procedure. HOWEVER, that may not be it. Here are additional issues that can come up:

1) you were unable to get the seat level previously and so now the two halves of the motor are not synced up right. This happened to me, I put it all back together and found that one buttcheek was sitting at least a half inch lower than the other. This will eventually drive you crazy. So, you need to re-sync the two motor halves. What you can do is all the above, make sure the black cable is all repaired and ready. Before reattaching to motor, put the seat back in the car. Make sure it is in the exact proper location where all the bolts are aligned. Why? Because the seat is weird, trust me on this one, if you are going to level it you ONLY want to do it when it's in the car in its normal spot. Otherwise, what is "level" on your garage floor won't be level in the car. I found this out the hard way.

So, you have put the seat back in the car with the black cable hanging loose. Pull it out so you can get at it, grab your cordless drill and wind that sucker (whichever way it is) until you get stuff leveled. Here is a pic to help you envision this:


2) now it's leveled out. Take seat back out, reattach cable to motor, reassemble everything, put back in car, finish it all off and you should be good.

Okay, that's all for now, I gotta go catch a flight to Vegas for the weekend. I hope that helps some of you guys, send me a PM if you need anything and I should get it via my email.

cheers

Sean Paul
__________________
Sean Paul
2003 M5 LeMans Blue with sport blue/black interior
Evolve SW, Alpha-N (MAF-delete) w/ IATS relocation, Dinan Stage 1 suspension, Rogue trans mounts, short shift, E46 ZHP shift knob, Magnaflows, Stoptech Slotted Rotors, Stainless front brake lines, ceramic pads, Beastpower titanium pedals, white LED interior lights.

doc$holliday is offline   Reply With Quote
The Following 21 Users Say Thank You to doc$holliday For This Useful Post:
155plus (24th June 2010), AMP (3rd September 2010), ard (19th November 2011), atljbo (18th October 2011), BiziM5 (4th November 2011), blackxs (24th June 2010), CapeCodM5 (24th June 2010), CSBM5 (3rd September 2010), duhfool (25th November 2010), Green95ss (28th September 2010), havasusteve03Beast (5th May 2011), Hdhntr23 (17th September 2010), if lookz kill (24th June 2010), jceg (25th June 2010), JDMM5 (22nd July 2012), KevinM (24th June 2010), primeral (3rd September 2010), TMcNasty (24th June 2010), vantaam5 (24th June 2010), Vector57 (9th September 2010), Wurger (31st March 2011)
Old 24th June 2010, 19:39   #2
vantaam5
Company Representative for Evolve Automotive
 
vantaam5's Avatar
 
Join Date: Aug 2009
Location: Luton,UK

Garage: A few toys...

Sales Feedback: (0)

Thanks: 854
Thanked 2,423 Times in 1,386 Posts
Thanks alot for the DIY!
Good to know when the seat fails one day!
vantaam5 is offline   Reply With Quote
Old 24th June 2010, 20:26   #3
CapeCodM5
Fellow Member (>400)
 
CapeCodM5's Avatar
 
Join Date: Oct 2000
Location: Cape Cod, MA, USA

Garage: M5

Sales Feedback: (0)

Thanks: 63
Thanked 54 Times in 49 Posts
Thank You

Another very helpful DIY post.
CapeCodM5 is offline   Reply With Quote
Old 24th June 2010, 21:55   #4
if lookz kill
Addicted Member (>300 posts)
 
if lookz kill's Avatar
 
Join Date: Feb 2007
Location: Los Angeles

Garage: 02 Imola E39

Sales Feedback: (1)

Thanks: 34
Thanked 21 Times in 19 Posts
very very nice DIY with good pictures. i will be doing this over this weekend so this came at a great time. thanks!
__________________
-Ethen

if lookz kill is offline   Reply With Quote
Old 24th June 2010, 22:44   #5
b757236
Member, P500, DSC On (>600)
 
b757236's Avatar
 
Join Date: Mar 2007
Location: USA

Garage: BMW

Sales Feedback: (0)

Thanks: 42
Thanked 36 Times in 23 Posts
Take the seat out...it is much easier!
b757236 is offline   Reply With Quote
Old 3rd September 2010, 14:07   #6
tyroone
Member, Sport: On DSC: On (>100 posts)
 
tyroone's Avatar
 
Join Date: Jun 2004
Location: Riyadh Saudi Arabia
Age: 39

Garage: M5 E60 Sliverstone II Metallic

Sales Feedback: (0)

Thanks: 7
Thanked 3 Times in 3 Posts
great DIY

great i will be doing this on my passenger seat. but i have a question i dont know if this is related to the subject or not. i took my car to the detail shop the ther day to clean the car from the inside but everything was fine in the car. the seat was ok and no problem what so ever in the car. but when i got it back, i found out that the airbag is on and when sat on the passenger side, found out that it is twisted. does the airbag light has something to do with the seat? i am affraid that they tried removing the seat that is where the cable got dissconneted and the airbag light came on....

any idea?

cheers
tyroone is offline   Reply With Quote
Old 3rd September 2010, 20:38   #7
AMP
Member, P500 Sport, MDM on (>800)
 
AMP's Avatar
 
Join Date: Feb 2001
Location: Tucson, AZ

Garage: '08 M6 Coupe - Stratus Gray

Sales Feedback: (0)

Thanks: 22
Thanked 341 Times in 187 Posts
As an aside here.... you can power the entire seat out of the car to test everything and make sure that it's functioning properly.

On the harness connector to the seat you'll see a number of different sized pins. The two largest blade type pins are the power feed. If you pop the hood off of the back of the connector you'll find a brown wire and a red/yellow wire feeding these pins. Brown is ground and red/yellow is B+. Make up some short cables using female slip-on spades (to slide onto the pins in the harness connector) and connect the other end to a 12V power source (I use a jumper pack). At this point you can operate all of the seat controls and make sure that it's all working before re-installing the seat in the car.

Normally I would post pin numbers, but I'm taking a long weekend and don't have the wiring diagrams here.

I usually use a heat gun (as you would use for heat-shrink tubing or stripping paint) to get the barrels off of the cables.
__________________
'12 Alpina B7 SWB Alpina Blue/Black (On Order)
'11 1M Coupe Alpine White/Black
'08 M6 Coupe Stratus/Black
'03 M5 Sedan Imola Red/Black (gone, but not forgotten)
'93 M5 Sedan (3.6) Sterling Silver/Black
'11 550i Dark Graphite/Oyster-Black (wife's car)

Past: '11 M3 Coupe | '08 M5 Sedan | '10 M3 Coupe | '07 M6 Coupe | '07 Z4 M Coupe | '04 M3 Coupe | '02 M5 Sedan | '95 M3 Coupe -- x2
AMP is offline   Reply With Quote
The Following User Says Thank You to AMP For This Useful Post:
jamiepeers (31st March 2011)
Old 3rd September 2010, 20:47   #8
AMP
Member, P500 Sport, MDM on (>800)
 
AMP's Avatar
 
Join Date: Feb 2001
Location: Tucson, AZ

Garage: '08 M6 Coupe - Stratus Gray

Sales Feedback: (0)

Thanks: 22
Thanked 341 Times in 187 Posts
Quote:
Originally Posted by tyroone View Post
great i will be doing this on my passenger seat. but i have a question i dont know if this is related to the subject or not. i took my car to the detail shop the ther day to clean the car from the inside but everything was fine in the car. the seat was ok and no problem what so ever in the car. but when i got it back, i found out that the airbag is on and when sat on the passenger side, found out that it is twisted. does the airbag light has something to do with the seat? i am affraid that they tried removing the seat that is where the cable got dissconneted and the airbag light came on....

any idea?

cheers

Most likely they removed the seat and then turned on the ignition while the seat was out.

There are three SRS (airbag) related items in the seats.

The first is the occupancy detector which determines if someone is in the seat and if so fires the airbag for that seat.

The second is the sensor to detect whether or not the seatbelt is fastened.

The third is the firing circuit for the belt pre-tensioner. This system fires a small explosive charge that retracts the seatbelt buckle toward the floor of the car should there be an impact.

If the car detects a fault in any of these items it will store a code and activate the airbag light in the cluster. In your case it was the fact that the seat was likely unplugged when the key was turned on. The only way to clear the light is to correct the problem and clear the codes with an appropriate code reader. Most generic tools can't clear airbag codes so you may need to take a trip to your mechanic. If there's a cost involved then I would ask the detailer to cover it.
AMP is offline   Reply With Quote
Old 3rd September 2010, 21:21   #9
primeral
Member, P500, DSC On (>600)
 
Join Date: Jul 2009
Location: Houston Area

Garage: 02 M5, Alpine White

Sales Feedback: (0)

Thanks: 26
Thanked 66 Times in 50 Posts
I'm having to do this operation a 2nd time, now on both seats. Thanks for the great pictures!

edit: instead, I'm considering some recaros hehe
__________________
(\__/) (\ /)
(='.'=) ( . .)
(")_(") c('')('')

Save the Manuals!

Last edited by primeral; 3rd September 2010 at 21:21.
primeral is offline   Reply With Quote
Old 3rd September 2010, 21:42   #10
tradin1
Company Representative for RK Autowerks
 
tradin1's Avatar
 
Join Date: Feb 2006
Location: austin/dallas

Garage: 00 carbon black/heritage black

Sales Feedback: (4)

Thanks: 276
Thanked 800 Times in 456 Posts
you dont need to remove the cord out of the plug, thats extra unnecessary work. when you determine which cord it is you need to lengthen, you can carefully cut off a half inch of the black cover AROUND THE METAL INSIDE THE COVER, and you are done.

much quicker doing it that way, i helped hdhntr do his at adams last weekend and he will tell you it only took 20-30 minutes max.
__________________
DCT E92 M3
Vortech V3 aftercooled, Technology/Cold/Comfort Packages, Carbon Fiber Roof, EDC, Eisenmann Race,
H&R Springs, Premium Sound, BMW Performance Spoiler, Vossen 20x9/10.5 Wheels.


M5
Vortech V7 intercooled ~20psi, Forged low compression engine, KWV2, SS headers,
Eisenmann race, HRE 540, Brembo 380x32 8 piston and 345x32 4 piston, few other stuff.

For product and service information, please visit our website!

www.RKAutowerks.com
Raza@RKAutowerks.com
tradin1 is offline   Reply With Quote
The Following User Says Thank You to tradin1 For This Useful Post:
Hdhntr23 (17th September 2010)
Reply

Bookmarks



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Twisted Drivers Seat - anyone experienced this? LEENA1 E39 M5 and E52 Z8 Discussion 44 31st July 2013 06:45
Seat Belt Twisted M5Prospect E39 M5 and E52 Z8 Discussion 15 20th April 2011 18:20
twisted seat if lookz kill E39 M5 and E52 Z8 Discussion 10 23rd September 2010 17:00
02 e39 M5 seat is all twisted up RJScotti E39 M5 and E52 Z8 Discussion 11 20th August 2009 05:52
DIY - Is replacing a rear seat belt recepticle DIY? M5VRICK E39 M5 and E52 Z8 Discussion 4 4th August 2009 17:55

Loading...

All times are GMT +2. The time now is 01:58.



Everything Copyright 2000-2008. Do not use ANYTHING from this site without written permission. All images, graphics, sound files, video files and text appearing on this web site are the exclusive property of m5board.com and are protected under international copyright laws. All images, graphics, sound files, video files and text on this site are for on-screen and on-site viewing and listening only. No part of this web site may be reproduced, copied, saved, stored, manipulated, or used in any form for personal or commercial purposes without the prior written permission of m5board.com. Use of any image or graphic as the basis for another photographic concept or illustration is a violation of the copyright. Any copyright infringement will be prosecuted to the full extent of federal and international copyright laws. M5board.com is an enthusiast board and we don't condone any dangerous activity. Our airfield events are completely safe based on years of experience, we conduct them during clear visibility with mature participants that have several years of experience with high-performance automobiles, large unobstructed run-off zones on sealed off private former military airbases and we clearly mark the braking zones. If inexperienced with high speed driving we do not recommend organizing your own event but attending a high-performance driving school. The use of the term "BMW" on this site is for reference only, and does not imply any connection between m5board.com and BMW AG or BMW North America.