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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > JB BMS USB Cable Pinout



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JB BMS USB Cable Pinout
Make your own JB BMS USB cable for less
Published by wetwillyskate
01-30-2012
JB BMS USB Cable Pinout

I searched all of the E90+ forums i know for a pinout of this "JB BMS USB Cable" and i couldn't find a thing. So i was stuck buying it for $35.

Step 1) Buy everything you need from a site like Mouser or Digikey

buy a TTL RS232 cable (5V) for $20

http://www.mouser.com/ProductDetail/...52bZBasxjZs%3d

buy a DB9 Male (pins not sockets) for $0.43.
If you're like me you have these in your parts bins already

buy a clamshell for $0.65 (or buy a nicer metal one for $2)

http://www.mouser.com/ProductDetail/...RQEfBJiA%3d%3d

Step 2) solder the black wire to pin 5 of the DB9 Male

Step 3) solder the red wire to pin 3 of the DB9 Male

Step 4) solder the yellow wire to pin 1 of the DB9 Male

Step 5) assemble clam-shell and you're done!

I know this only saves $10-$15, but the principle of the matter is that you shouldn't charge more for something by playing on the ignorance of your customers.
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  #1  
By teamyamaha91 on 03-03-2014, 08:03 PM
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Correct me if I am wrong, but would that only be vcc, gnd, and rx? How would we transmit without the TX line?

I am also trying to make my own cable and was able to trace on the jb4 pin 3 as RX, pin 1 as TX, and pin 9 as an unknown for me. I was not able to find any other pins that actually go anywhere on the jb4 board.
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  #2  
By Chocolate Apocalypse on 03-03-2014, 09:26 PM
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Looks like yellow(1), orange(3) then black(5) here:

http://www.e90post.com/forums/showthread.php?t=359363
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  #3  
By Chocolate Apocalypse on 03-05-2014, 09:01 PM
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I can attest to the yellow, orange and black wires doing the trick. Just upgraded my BMS CAN tool with my homemade serial to USB cord
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  #4  
By Maniac0908 on 03-12-2014, 08:50 PM
Does anyone know which wires are which? Im guessing black is ground. But which is tx and rx?
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