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      01-30-2012, 10:09 AM   #1
wetwillyskate
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Drives: 2011 335i MT
Join Date: Jan 2012
Location: Greenville, SC

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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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