I have a CDX-F5710 in my car. When I power on/off car, there's a loud buzzing noise coming out from the front right speaker. On the stereo's screen, it says FAILURE. After about 10 seconds, the sound goes away, and everything works just fine. The loud noise comes back when I turn off my car. How do I fix this?

I popped open the stereo system, and all the wires seem to be in the right place (all colors match up). If I disconnect only the right-front speaker, I do not get the buzz, nor do I get the FAILURE message.