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if there isn't a separate switch, or a position on the selector, there is probably a switch built into the jack, similar to the speaker cut out switches on many headphone jacks, that cut off the speaker when you use headphones. Some FM multiplex jacks have switches too, my Motorola console has a switch built into the jacks that combines the channels, unless you plug in an FM demultiplexer. Then when you plug in a stereo Fm converter, it switches the input to the jacks for the output of the demultiplexer. Otherwise they would have had to add an extra switch, or another position on the selector switch.
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