BOSE 2ch System

It receives the TEL voice signal from AV (NAVI) control unit and output it to the BOSE amp.
It receives the sound signal from DVD player and sends it to the BOSE amp.
It controls sound volume of each speaker when outputting TEL voice and voice guidance.
It subjects to Audio Pilot® processing when receiving sound signal from microphone for Audio Pilot®.

Fig 1: Identifying Audio Unit (BOSE 2ch System)

Courtesy of NISSAN MOTOR CO., U.S.A.