Thread: Jb4 Confusion
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      02-05-2013, 02:47 PM   #3
Manuts
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Drives: 328i
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If you currently have an JB3, you need to modify the harness in order to install the JB4. You also need to install a power wire. See link below

http://www.e90post.com/forums/showthread.php?t=489350
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