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Check all your fuses, including the one under the hood.
as for the sub, was the power wire hooked up when you tried to turn it on? lol Just asking. if you turned the amp output on on the radio then when radio is on hit menu and then go into audio settings like you are going to mess with the bass and treble and there is now an option to set sub output and check to make sure amp is getting power. It may sound small but alot of people don't get power to the amp due to like bad ground or blown fuse and think there is something wrong but just needs better gorund or new fuse. Not saying this is your case but just making sure.
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