I remember another issue I had with the obd2 Bluetooth module that I have. It is so low profile to keep it out of the way I guess it has problems seating onto some obd2 ports. I had to press it into the plug extra hard to get it to work sometimes when I first got it. It loosened up with usage.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install