Here are a couple things to ckeck. 1st. The blue connector must have a jumper plug on it - if its connected to the voice control module it will interfere with the ULF - put a jumper plug on (don't worry you will still have voice control). 2nd. There is a BMW technical service bulletin that you can find on bluetoothyourbmw.com that references no audio problems on the X5 - its simply a case of not having the connector plugged in the back of the head unit properly - easy fix. 3rd. You might have a problem with the tel-on signal or possibly an older version of the HU but both are unlikely.

Try the first two and let us know the results.

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Randy...
EIS, Ltd.