[notorious]

I think if you code RNS-D 'non-BOSE' you won't hear anything since in BOSE config RNS-D send L and R signal to BOSE amp via line-out pins and doesn't use normal directly connected speaker pins. If your car had BOSE from day one your speaker pins are not connected. The sound goes from RNS-D pre-amp via line-out pins to BOSE amp in your boot.