Let me post the pictures to make the story shorter. 1. You need the MFD with the BT board inside. The parts number of the 7 keys MFDs you may need are 86110-47220, 86110-47260, 86110-47200 (Japanese version),or 86110-47270 (Japanese version). The parts number of the 4 keys MFD /w BT is 86110-47210. There is no BT board in the 86110-47230 and 86110-47240. 2. 47220 (7 keys /w BT) vs 47230 (4 keys /wo BT) comparison. 3. The blue tooth board. 4. Check the wires and rewire them from the overhead console to the MFD if needed. 5. It's better to have the extra key for the phone, try to get the right side switch of the steering wheel. 6. You might need the Q7 version board of the overhead console because of the microphone amplifier. Or, you can build the board by yourself as I did. 7. Check the mic input level. If the gain of the amplifier is not enough, there is another setting about the voice level you can adjust.