DAVID, anonymous is right, there is a light blue wire comeing off the back of the head unit and that is used to power up an amp. Head units don't give off enough power to run a sub, u need to get an amp. And as soon as u do then u can put in a toogle switch on the remote wire.
Hydro
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DAvid usually there are some Head Units which have subwoofer Controls just look around for one of them. Jeremy there are many Head Units that are out now that have a Amplifier output wire which removes the process of installing a Toggle switch I dont understand why you would want one If you dont have to have it.