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Thread: Ultimate DIY for 18 Button OBC Upgrade from 7 or 11 Button OBC Made Easy w/ Pictures!

  1. #151
    Join Date
    Jun 2013
    Location
    Tampa florida
    Posts
    82
    My Cars
    M-5, 99 Touring, 2k 525
    Wondering can I swap 95 325i 18-button with a 98 325ic directly.
    If I took the 18 button can I just connect the 7-button with out any mods using the 98's connectors?

  2. #152
    Join Date
    Jun 2009
    Location
    South Carolina
    Posts
    31,073
    My Cars
    2004 330 vert 2004 X5
    Quote Originally Posted by Tampa 325ic View Post
    Wondering can I swap 95 325i 18-button with a 98 325ic directly. If I took the 18 button can I just connect the 7-button with out any mods using the 98's connectors?
    No you can't. You have to reverse the wiring that's described in this thread.

  3. #153
    Join Date
    Oct 2003
    Location
    Ottawa
    Posts
    1,194
    My Cars
    1995 BMW 325i
    if you are going from a 18-button to a 7-button, then the power/negative lines have to be moved from the one connector to the other. I forget which ones. I believe that is pretty much it. The rest doesn't need to be reversed in my opinion as the black connector can be left in behind and it will not cause harm.

    Why are you stepping back? Or, you taking the 18-button and putting it in the '98, and then moving the 7-button and placing that in the '95 model year?

    Paul
    Current Cars:
    1995 BMW 325i
    2013 BMW X3
    2017 Infiniti QX30


    Past Cars:
    1997 BMW M3
    2011 Chevrolet Avalanche LTZ
    2010 GMC Terrain
    1998 BMW 328is
    2006 BMW 325i
    2007 Saab 9-3ss AERO
    2004 Saab 9-3ss Linear
    2003 PT Cruiser
    2001 Volvo S40
    1990 Honda Accord EX-R

  4. #154
    Join Date
    Jan 2015
    Location
    georgia
    Posts
    4
    My Cars
    bmw 328is
    My car has 18 button obc from factory, but the CODE function is not working. When I activate the CODE function the car still starting up. Can anyone help me to resolve this problem? Any ideas?

  5. #155
    Join Date
    Jun 2009
    Location
    South Carolina
    Posts
    31,073
    My Cars
    2004 330 vert 2004 X5
    What's the procedure you're using?

  6. #156
    Join Date
    Jan 2015
    Location
    georgia
    Posts
    4
    My Cars
    bmw 328is
    Turning the key into position 2, then pushing the CODE button, setting the code and pushing the set button. CODE button lamp is blinking. When I start the engine it starts without entering the code but OBC still wants to write the code.

  7. #157
    Join Date
    Jun 2009
    Location
    South Carolina
    Posts
    31,073
    My Cars
    2004 330 vert 2004 X5
    Try that procedure but turn the key to position 1

  8. #158
    Join Date
    Jan 2015
    Location
    georgia
    Posts
    4
    My Cars
    bmw 328is
    Still the same ((

  9. #159
    Join Date
    Jun 2009
    Location
    South Carolina
    Posts
    31,073
    My Cars
    2004 330 vert 2004 X5
    I bet your car did not come with 18 button from the factory. When you upgrade from 11 to 18 the code button doesn't work unless you do some special wiring. Either that or you have a faulty 18 button.

  10. #160
    Join Date
    Jan 2015
    Location
    georgia
    Posts
    4
    My Cars
    bmw 328is
    You can check by vin code than there is 18 button obc from factory. )) There was aftermarket alarm system on my car but previous owner uninstalled it. Maybe the problem is something in wiring. Maybe he cut or did something else with the wirings.

    vin is WBABG1334XET07956
    Last edited by datunia; 05-04-2016 at 06:31 PM.

  11. #161
    Join Date
    Mar 2015
    Location
    Charleston, SC
    Posts
    16
    My Cars
    1998 328is
    I just finished this install and the write-up was very helpful.
    I have a 1998 328is with an 11 button, and I found that several of the wires, including the illusive black/green wire for the code function were already part of the old 11 button black connector. For the black/green specifically, I just connected together the black/green from each obc connector, to the black/green on the car and have full functionality of the CODE feature
    I probably could've gotten away with not cutting the black connector off completely, something for others to keep in mind.
    Thanks again for this write-up.

    Sent from my LG-H820 using Tapatalk

  12. #162
    Join Date
    Oct 2012
    Location
    Perthshire, Scotland
    Posts
    168
    My Cars
    E36 Touring
    Sorry for bumping an old thread.

    Does anyone have the pictures to go with this retrofit?


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