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In my idea, the pin 5&6 is basically a circuit for sensing the HU that there is a device connect to AUX.
By wiring the pin 5&6 to 3.5mm switch type female jack (the jack has 5 pin two for switching, three for audio signal), this will tell the HU that the AUX mode would available when we press the CD/AUX button if there is nothing connect to it the AUX function will be disable.
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