I have n 03 enthusiast stock speakers, my right rear speaker just stopped working all other speakers work fine, no sound at all comes out....im assuming wiring short....anyone know where I should start?

 

take a volt meter set it to ohms , see if you get a reading from the voice coil , then pop the speaker with a battery

if your car is 9 years old
and the stereo is stock
the speaker is blown

start with a pair of new speakers

or if you are not looking to just fix the problem , but instead upgrade , if non bose you could disconnect rears, throw decent components up front off an amp

 

Without proper test equipment this is pain-in-the *** trouble shooting.

Get a wiring diagram from the service manual.
Work backwards from the speaker.
The head unit out is a powered signal for no-Bose. You should be able to test there. Good luck.