Fix aux port in 2010 mazda 33/12/2024 The core issue was indeed that the little 3.5mm input jack's "plug detection" conductor was internally broken. Again, don't ask me why they would have taken this effort to disallow this choice w/o a physical plug inserted into the AUX input jack. The stereo software will not allow the user to select the "AUX"/(media) input unless there is a plug inserted. GND, LEFT audio analog IN, RIGHT audio analog IN, and this plug-SENSE IN (grounded = plug inserted). This 3.5mm socket (and the circuit going back to the stereo) has 4 conductors. When a 3.5mm plug is inserted into this jack it is supposed to "ground" its "sense" pin and this is used to electronically detect the presence of the inserted plug. For some (I think ODD) reason the engineers used a "sensing"-style 3.5mm input jack. ![]() It was the internals of the little 3.5mm stereo input jack. The posts here helped me solve the problem. I have the '08 Mazda 5 and was experiencing the same issue with the"Media" button on the radio console, as well as the "Mode" button on the steering wheel stereo controls not ever selecting the "Aux" mini stereo input jack next to the accessory power socket. I know this is a Mazda CX-9 forum but luckily a Google search landed me here.
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