Av unit grounding please

[TDot]

Does anyone know the exact point the av unit is grounded to behind the dash so I don't have to pull up the entire dash and trace the harness?

[cruzad3r]

what are you trying to do? worst case if no one here knows you might have to trace the FSM. kind of pain in the butt first but it'll make sense after a while

seriously, what are you trying to do?

[TDot]

The fsm doesn't specifically show the grounding point of the av control unit. I need to use the common ground for the av unit because I converted the nav unit into a dual monitor system for my computer. I can use a ground isolator, but I'd rather do it right.