well, the little l.e.d in the button must of broke perhaps. you'l know when the A/C engages cuz you'l feel it through the engine. but if it bothers you that much, just take it out and look if any wire broke and such
also, to prevent some one steeling you stero again, super glue some nice razor blades in the back... hahha, sure they'l never steel another stero again
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