As the title states my right rear speaker is not out putting sound. First off it has premium sound with power antenna which is also NOT working... it has a Pioneer Head Unit that was in it when i bought the car back in December. I did try switching out the speakers before i came here so don't worry about that im thinking its either the wiring harness to the HU or a problem from the HU to the speaker as in speaker wire is shorted to ground... of course im thinking this HU was bought and installed at either Best Buy or Circuit City just because the previous owner was an older gentleman. SO what steps should i take first in diagnosing this problem? I am thinking about just going to the local sound shop and buying a brand new wiring harness but tell me if im wrong here.