Av Control Unit

WARNING: This page is about a different car, the 2013 Infiniti M56 and 2013 Infiniti M37. However, it is still accessible from the selected car via links, so may be relevant.

AV control unit is installed at the center of the instrument panel.
It is connected to TCU with the USB harness and signals necessary for Telematics function is sent and received.
Switch operation signals used for the Telematics system are transmitted to TCU via USB communication from the AV control unit.

Fig 1: Identifying AV Control Unit
Courtesy of NISSAN NORTH AMERICA, INC.