Did you install a crossover with the front components? If you set your fader to the rear speakers, do you hear anything? Try to isolate the problem. If it started right after you installed the components, then unplug them individually to see if there is any change.
I would pull the door panel off and make sure everything is still connected. Like mentioned, did you just replace speakers or did you add speakers with a passive crossover (the little box that comes with 99% of 'components')?
Thank you for all the suggestions , I have a sport n I ended up taking it to the dealer for an oil change n they fixed it with no charge , came to be a ground issue that came loose, again thank you all for the help