System Description

WARNING: This page is about a different car, the 2008 Infiniti FX45 and 2008 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

With the ignition switch in ACC or ON, power is supplied

through 10A fuse [No. 6, located in the fuse block (J/B)]
to audio unit terminal 10.
Ground is supplied through the case of the antenna amp.

When the radio switch is turned ON, antenna signal is supplied
through audio unit terminal 5
to the antenna amp.
Then the antenna amp. is activated.

The amplified radio signals are supplied to the audio unit through the antenna amp.