I have a 99 Maxima I changed out the radio and now my front speakers are my rear speakers won't play the only thing that will play is the subwoofer what did I do wrong I bought the harness that told me to buy and everything but now my speakers don't work can somebody please help me out thank you

 

Need more info, guy.

What was the old radio, a Bose or the standard? What did you install? What adapter cable did you get?