E46Fanatics

E46Fanatics (http://forum.e46fanatics.com/index.php)
-   DIY: Do It Yourself (http://forum.e46fanatics.com/forumdisplay.php?f=27)
-   -   Fixing the airbag light - seat belt pretensioner error code (http://forum.e46fanatics.com/showthread.php?t=565806)

tim330i 04-14-2008 10:23 PM

Fixing the airbag light - seat belt pretensioner error code
 
Recently my airbag light randomly came on. After searching around on the site I realized the only way to accurately diagnose the issue is with a airbag code reader/reset tool. Ken at www.Bimmertools.com hooked me up and in a few days I had a shiny new tool.

https://secure.4siteusa.com/WhatsYou...categoryID=146

Here is how I fixed the common seat belt pretensioner issue. My searching turned up an interesting issue. Often times the pretensioner itself isn't bad, just the wiring. I was hoping this was the case because the wiring is much cheaper than the pretensioner. I had a spare wiring harness handy. If you don't (why would you) I would suggest ordering one (approximately $15) and trying this before you invest in a new pre-tensioner.

************************
** Use this at your own risk **
************************

1) This is what I started with
http://photos.e46fanatics.com/data/5...TheProblem.jpg

2) Here is my brand new Peake tool from BimmerTools.com
http://photos.e46fanatics.com/data/500/thumbs/Tool.jpg

3) Plug in the Peake too to the OBD port that is in the drivers side foot well. This should be attached to the underside kick plastic....but mine isn't...yeah.
http://photos.e46fanatics.com/data/5...s/Plugitin.jpg

4) Read your codes following the directions that came with the tool, very simple.
http://photos.e46fanatics.com/data/5...adingCodes.jpg

5) My code was table 10, code 02 which is drivers side pre-tensioner.

6) Start by disconnecting the battery.
http://photos.e46fanatics.com/data/5...ectBattery.jpg

7) Disconnect the under seat connector freeing the seat from the wiring harness. You can pop the connector open by using a screwdriver to move the slider/lock over towards the centerline of the car. You can see the lock is moved over a finger width in the first picture. In the second picture you can see the lock all the way out (next to my thumb).
http://photos.e46fanatics.com/data/5...s/IMG_0040.jpg http://photos.e46fanatics.com/data/5...s/IMG_0042.jpg

8) Unbolt the rear two seat bolts.
http://photos.e46fanatics.com/data/5.../IMG_00272.jpg http://photos.e46fanatics.com/data/5.../IMG_00262.jpg

9) Remove the plastic caps covering the front seat nuts.
http://photos.e46fanatics.com/data/5.../IMG_00282.jpg

10) Remove the front seat bolts.
http://photos.e46fanatics.com/data/5...s/IMG_0031.jpg

11) Remove the seat headrest, tilt the steering wheel up and push it all the way in. Lift the seat up and rotate it around and sneak it out the door. If you have a sedan you can leave the seat belt attached to the seat. I set the seat just outside the door.
http://photos.e46fanatics.com/data/5...s/IMG_0035.jpg

12) Remove the wiring harness from the pre-tensioner.
http://photos.e46fanatics.com/data/5...s/IMG_0033.jpg

13) Remove the wiring harness plug from under the seat by pressing the two clips on either side to release it, the slide it back. Look at the second picture to understand what you're trying to unclip.
http://photos.e46fanatics.com/data/5...s/IMG_0040.jpg http://photos.e46fanatics.com/data/5.../IMG_00411.jpg

14) Cut the one zip tie that holds the wires and undo the other wire holding clip.

15) Remove the black shield part of the connection. You need to pull back the clips on both sides. The clip is just at the tip of my thumb.
http://photos.e46fanatics.com/data/5.../IMG_00361.jpg

16) Take your new wiring harness and connect it to the pre-tensioner. Don't worry about routing the wires under the seat yet. We want to test the new wiring harness before we bolt everything back together.

17) Plug the yellow connectors together reconnecting the pre-tensioner to the car. I rigged it up so I could plug in the seat while it was sitting outside next to the door.
http://photos.e46fanatics.com/data/5...s/IMG_0035.jpg

18) Reconnect the battery, reconnect the Peake tool, clear the codes and cross your fingers!
http://photos.e46fanatics.com/data/5...ectBattery.jpg

19) Success!
http://photos.e46fanatics.com/data/5...s/IMG_0047.jpg

20) If you're airbag light is still on disconnect the battery and recheck all your connections, try reseating all the connectors, plugs, etc and test again. If your airbag light is still on then you're going to need to order the pre-tensioner. Bolt everything back together for now until you get the new parts.

21) Assuming the lights off it's now time to put everything back together.

22) Disconnect the battery and then disconnect the seat wiring.

23) Route the wiring on the seat back in the correctly (reverse of how you took everything apart), mount the yellow plug back under the seat and you're ready to mount the seat again.

24) Put the seat back in, bolt it down, reconnect the wiring, reconnect the battery, etc.

25) Done and done, congratulations!

tim330i 05-22-2008 05:26 PM

Shameless bump. I made this thread a long time ago but with out images. We just recently upgrade the photo section to allow for the handy thumbnails, so I put in the images and it is good to go.

Hope this helps, it would have really helped me.

Tim

Tom Busby 05-22-2008 05:54 PM

Nice post about a cheap fix!

HawgDriver 06-28-2008 01:43 PM

Great
 
Great write-up...you just saved me $200 bones. I just completed the DIY in about 1.5hrs and took the time to clean everything under the seat area.

Thanks!

benfano 09-13-2008 11:45 PM

what is the part number of the wiring harness?
where did you buy it?

Steve@ASPTuning 09-14-2008 01:27 AM

Usually its the seatbelt tensioner itself that's faulty... and I haven't gotten around to fix mine yet... I really hope its a cheap fix like the window regulator and the zip tie trick! hahaha.

Tim, how did you test to make sure that it was the plug itself at fault? Multimeter? or something....? Please let me know.
Great write-up btw!

Thanks,
Steve
ASPTuning

taghirap 09-14-2008 09:50 AM

the seatbelt tensioner cost around $15. its easy to fix.

surewin 10-03-2008 09:41 AM

Great DIY as usual, Tim.

However, this coder reader/reset tool isn't compatible w/ my '04 3 series. Ken told me that the '04 E46 has a new ECU and the Peake tool won't work w/ it. Are you guys familiar with any other tools that would be compatible w/ my car? Thanks-

m3m3me 10-05-2008 12:56 AM

1 Attachment(s)
I like my Autoenginuity laptop based diagnostic tool.
I needed an airbag reset tool and I needed a SES reset tool and together the two totalled about $200, so I bit the bullet and have never regretted the $500 investment. I figure I'm going to keep my M forever, so I may as well know what's going on and not depend on the dealer.
http://autoenginuity.com/products.html

Here's a list of all the systems you can diagnose with the expanded BMW module. Not just a code reader and reset tool. Enjoy!

http://www.autoenginuity.com/BMW-All-Systems-List.html

doozyj 10-06-2008 07:50 PM

Quote:

Originally Posted by benfano (Post 8528853)
what is the part number of the wiring harness?
where did you buy it?

Need to bump.

Anyone know the part number of the wiring harness and/or seatbelt tensioner (drivers side)?
Thanks.

blank1984 10-07-2008 11:06 AM

B....U....M....P
I need the p/n for the harness too. Replace the cheap stuff first. :)

benfano 10-07-2008 11:50 PM

Quote:

Originally Posted by blank1984 (Post 8647004)
B....U....M....P
I need the p/n for the harness too. Replace the cheap stuff first. :)

I replaced this cable last month and didn't see SRS light anymore.
About $14.00 P/N 52108255704

I also want to sell the srs scanner R5/SRS, because i don't use it anymore, $105 shipped

http://www.benfano.com/wire.jpg

blank1984 10-23-2008 02:50 PM

replaced it and i still have the light. :(
is there a way to reset it w/o the srs tool? i had one, but it wouldn't work with my car. and, the "disconnect the battery and turn the flashers on 'til the modules drain" won't work because the flashers won't work with the battery disconnected.
any ideas or should i just bring it up to the stealership and get boned $100, for it to possibly still be jacked up?

yoda2 10-23-2008 05:00 PM

Nice DIY. My airbag light flickers on and off when a passenger is sitting in the seat. Not sure why it's doing that.

benfano 10-24-2008 09:07 PM

Quote:

Originally Posted by blank1984 (Post 8742352)
replaced it and i still have the light. :(
is there a way to reset it w/o the srs tool? i had one, but it wouldn't work with my car. and, the "disconnect the battery and turn the flashers on 'til the modules drain" won't work because the flashers won't work with the battery disconnected.
any ideas or should i just bring it up to the stealership and get boned $100, for it to possibly still be jacked up?

I bought the scanner/reset tool from one of sponsor in here, $120 shipped.
After i replaced this part, i scanned and then reset it with this tool.
I sold the reset tool last week $115 on ebay.
So, you can do the same, or you can buy the reset tool from other fanatics
http://forum.e46fanatics.com/showthr...srs+reset+tool

tim330i 10-29-2008 10:08 AM

Quote:

Originally Posted by benfano (Post 8651267)
I replaced this cable last month and didn't see SRS light anymore.
About $14.00 P/N 52108255704

I also want to sell the srs scanner R5/SRS, because i don't use it anymore, $105 shipped

http://www.benfano.com/wire.jpg

I didn't know the wiring harness came with that yellow part. I've updated my DIY removing a couple un-needed steps :thumbup:

Tim

CWABimmer 11-20-2008 09:59 PM

I just did this swap without taking the seat out since I couldn't find the right size wrench to get the seat bolts out...

Anyways, a lot of it was by touch but it is possible!

malina 12-29-2008 07:05 PM

Quote:

Originally Posted by yoda2 (Post 8743201)
Nice DIY. My airbag light flickers on and off when a passenger is sitting in the seat. Not sure why it's doing that.

I have the same issue. :help:

GuessWho 12-30-2008 04:10 AM

Quote:

Originally Posted by malina (Post 9143060)
I have the same issue. :help:

Mine too, and making me nervous...specially during the night :banghead:

DiceyOne 01-12-2009 03:45 PM

Tim, thanks to you I had a big win today. SRS light was dispatched w/o a problem. This only took me 25 minutes, $16, and i didn't even have to take the seat out of the car, i just maneuvered it so that the base was forward and the back was to the drivers side. Thanks again. :woot:

- Joe


All times are GMT -5. The time now is 05:14 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use