Maybe I need to rephrase the question. On the factory setup, if audio signal is conveyed from the head unit to the amplifier via the MOST connector then what does the yellow connector actually do?
Yellow / Red Left Rear Line Output Positive Yellow Connector C - Pin 1
Red / Blue Right Rear Line Output Positive Yellow Connector C - Pin 2
Brown / Blue Common Audio Ground Yellow Connector C - Pin 3
Green / Red Left Front Line Output Positive Yellow Connector C - Pin 4
Violet / Red Right Front Line Output Positive Yellow Connector C - Pin 5
Black / Red 12 Volt Switched Power Yellow Connector C - Pin 6
