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First to start you need an amp something that is a little stronger than your subs. What you want to do is 'T' off your speaker wires into RCA's to hook up into the amp. There is a device you can buy or you can cut some RCA cables. There are a few down sides to do it this way because as you turn up the volume the Subs will get louder and start to distort a lot faster than hooking up proper. The best way to do it is to get a deck with RCA sub outputs. Good Luck
Check for a "jammed" button. They use a little rubber membrane behind buttons and over time they do wear out. It is possible to push a button on the corner, make it shift enough to jam behind the faceplate & hard to see. Just push the button and see if it pops back like the rest of the buttons on the unit. If it still has a problem, post a comment and I will help you some more. Hope this helps
Look in your owners manual and make sure you are turning the right knobs or pushing the right buttons once you have the adjustment screen for the bass/treble showing. It could be that they use different knobs/buttons than the volume control. If you are using the right controls, then you have a problem that only a shop can fix. You might reset by taking away all the power (acc and bu) for a couple minutes and then reconnect, but if that doesn't help then it time to go to the shop.