Do you mean the Hands Free Link that pairs your phone with the audio system? If so, then it sounds like your HFL board has died. I have the same vehicle and the same problem. A new board costs about $200 online (part # 39770-S3V-A61ZB; there's also a 39770-S3V-A61ZA but it costs ~$80 more and as near as I can tell the only difference is that it's a different color, but since you can't see it, no sense in paying extra for that) and is located in the compartment in the ceiling just above the rearview mirror (where the two overhead lights, sunroof switch, and OnStar controls are). It's not terribly hard to pull out and replace the board yourself (there's a guy who posted a series of Youtube videos for doing it on a TL, but it's virtually the same procedure on the MDX, search for 'HFL removal and install").
SOURCE: 2006 Acura MDX bluetooth stopped
Bluetooths have batteries, Rechargeable. If it won't hold a charge replace the batt.
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