Rear speakers stopped working

The most common solution is both rear speakers are bad. Not what you expect, but is what we usually find. could be a driver in the radio.
Go back to the rear speaker and put your ear right on the speaker and notice if there is a faint sound.
Have a test speaker and plug up before you buy the correct ones.

There is no fuse to the speakers your rear speaker wires should run under the kick plateon drivers side broken or disconnected wire or burned out channel in radio.

you bought it new ... every new prodycts should come with warranty therefore best advice take it down to where ever you bought it from

The main reason why the rear speakers are not working because the sound you are playing are not surround sound or a not a stereo sound and check the setting of your speaker. There is an output sound in your speaker but to low because of the set up of your speakers. Try to set it in Hall, Church, or any set up you will notice that there is difference with there volume in every set up.

First of all if you have not made any connection changes in the system prior to loosing the sound try these steps.
Go into the system menu and in speaker configuration see if somebody has given the rear ( surround ) speakers as none. If not just exchange the front and back speakers to confirm if its a speaker failure . If not you will need professional help to fix a damaged surround amplifier.

your rear power amplifier has failed

Is the source signal of a surround sound type? Also, be sure that the rear speakers are on, (if your receiver has a speaker switch on it), and they are hooked up properly.

You need to attach the blue wire on the stereo harness to the blue and white wire on the car adapter harness. they installed a small amplifier to power the rear door speakers and unless you connect those two wires then the speakers will not work.

Sir,
I do not want to insult you in any way, but I must ask just in case it was overlooked! First check to be sure that the speaker settings on the stereo were not set all the way to the front. If that is not the problem, you can hook another speaker you know works to the wireing to the rear speakers to check to see if it is the speaker or the wireing. If you hear sound from the speaker you know works, then your speakers in the car are bad. If you do not hear sound, then it will be from the wireing. Next is the more difficult part. You will have to pull the stereo out and can splice into the wires. Hook the good speakers up to the splice and check for sound. make sure you know for sure the wires you splice into are for the rear speakers. If you still hear no sound, then it is more then likely a problem in the stereo itself. If you do hear sound then there is a problem in the wireing somewhere and may be easier to just run new wires to the rear speakers.

If the amp still goes into protect mode, the easiest thing to do is disconnect the RCA cables from the amp and see if still goes into protect mode (after turning off/on). If it does, the issue lies in the amp or the wiring to/from the amp (most likely case). Check to make sure no speaker wires came loose and touched +12V or ground (car body). From the sound of it, my guess is something internal to the amp died and will need repair.