Thanks wasn't sure if it was 05 or 06. My 04 has developed the dreaded IC pickup noise. Had it to the dealer for service and asked to check. Honda said it was because of the helmet/ boom mike and I had the mute set to high. I saw a used 05 audio unit on ebay for $80.
I have not tested an 05, so I don't know if it is fixed on them or not. I have tested an 06, and the microphonics problem is definetly fixed on the 06 models.
It would be an easy thing to test. Find an 05, put on the headset and turn on the ignition. Turn the intercom volume all the way up, and then tap your finger on the gas tank lid and see if you can hear it in the headset.
You better check all the pin out wiring on the 06 model before you spend big bucks on a new audio unit. With the addition of the new amp, I would not be at all suprised to find that some of the wiring in the harness has changed. This COULD mean that an 06 Audio unit will not be compatible with the wiring harness connectors on previous models.
You would need to carefully examine the pin out numbers and signal names on all the wires for both models to make sure something hasn't changed.
Take a look at the 06 manual and simply compare the pin outs and signal names on the two connectors to what it shows in the 02-05 manual. Shouldn't take more than about 15 minutes to see if they match up or not.
Fred, do you know if anyone has taken the radio unit apart to isolate this issue? Audio issues such as this should be easy to narrow down and repair, if Honda's engineers can find it and fix it in the later models then there's got to be a way to mod the older ones. :?
Ah, if it were ony a simple thing techdude2000. If the wrong type of capacitors were spec'd in the design, they could be the source of the microphonics. That would make it a much more difficult fix for the versions experiencing the problem. I've thought about subjecting one of the circuit boards to a very heavy coat of humiseal, or sticking on something like dynomat, to see if it would dampen the sensitivity to the mechanically induced modulation. All speculations of course.