Well guys, I've been really wanting to upgrade my Si's stereo but didn't want to loose the factory Bluetooth wheel controls. I've been emailing Metra and their lead tech contacted me about their wheel control products. Basically they will work for the audio controls but not Bluetooth (answer/hangup). Their product, the ASWC, works on the Honda CRZ in terms of BT functionality but i asked him why the CRZ and not the Civic. Let me show you what he wrote.
This leads me to believe that the Bluetooth module is outside the radio and that if the radio is taken out, you can still theoretically tap into the module and use it. Use the factory mic, buttons, and BT regardless of the new headunit you put in. You would just need to know what wires in the harness control the Bluetooth. If someone more tech savy than I can get a wiring diagram or something to accomplish this, that would be awesome."Unfortunately the bluetooth buttons will be lost. But the audio buttons will work. It's not Axxess that prohibits Bluetooth, it's Honda. If a manufactuer (Honda in this case) designs the bluetooth in the radio, you can keep the buttons. But if they design the bluetooth outside the radio, then the buttons will be lost, because the wires are not at the radio to retain the bluetooth. They are at the bluetooth module. Nothing we can do in this situation except to make a bluetooth bypass module, which we will in the future."