Power Supply And Ground

WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

Power is supplied at all times

through 20A fuse (No. 31, located in the fuse and fusible link box)
to rear view camera control unit terminal 1.

When ignition switch is in ACC or ON position, power is supplied

through 10A fuse [No. 4, located in the fuse block (J/B)]
to rear view camera control unit terminal 2.

Ground is supplied

to rear view camera control unit terminal 3 and
to rear view camera terminal 2
through grounds B7 and B19.