I recently picked up a Pioneer AVH4100NEX for the primary purpose of being able to have google maps display on the radio. My vehicle's drive noise is too high to use the radio and speakers for phone calls. Is there any way to force the phone to keep using my Bluetooth? I've tried unpairing the radio, as well as forcing my ear piece to be set for phone calls, but it switches back to the radio immediately. Is there a work around? Surely I can't be the only one who doesn't want to use the radio as a phone?