My car speaker isn't working?

My front right car door speaker works, but there's no sound. I think it's my connections, but I matched the wires right. Other than that I'm clueless. Also, my usb won't play music from my iPhone 6, and my aid cord plays muffled music with no vocals. I have a JVC KD-r431 radio in right now. So right now I'm listening to music in my front left door speaker. I have a subwoofer I want to put in. But have yet to buy an amp. I have a 1989 crx si

"My front right car door speaker works, but there's no sound." Lost me there.

Do the speakers work when you just play the radio? Or only when you attempt to play music via your phone or usb?
there's a good chance that it could just be the cord that connects your phone and the head unit.
if that is not the solution, i would consider replacing the head unit, if the wiring is correct then the only other problem that could occur would be a blown fuse in the head unit or just a bad head unit.

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