I've nearly given up on the BC127 route at this point.

I bought one of Sierra Wireless' BC-127 DiscKit boards which is about 3-4 times more expensive than that SparkFun board.

I bought it because the Sierra Wireless guy on their forum was having no trouble with his BC127, and so I wondered if maybe it was the sparkfun board that was the problem, and using Sierra's own board would solve my problem.

It didn't: The same problems are there. I think that the BC127 is just incompatible with the Honda stereo, or vice-versa. I'm wondering if there is another different place I can source a similar board that's easy to mess with at a hobbyist level.

SparkFun has an RN-52 breakout board. I'd have to roll my own audio connection, but I wonder if the RN-52 is any better? Sigh.
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Tony Fabris