rear speaker issue

[svtl919]

please help
i installed a p1400dvd and noticed that my back speaker are not working. i look at the menu and they rear speakers are grayed out. if all sources are turned off i can change rear speaker for full or sub but does not change anything once i turn on a source. do you think but could be blown would this cause them to be grayed out on the menu?
did i wire the rears wrong? would that cause the rears to show grayed out?
there is not factory amp running the rears is there?
i found this out by my daughter asking me to turn up the music all the time.
my expedition is a 2005 xlt

 

[GAINMOB]

you may have to go through the initial setup again by disconnecting the battery...there you will eventually find the area dealing with speaker setup...whatever you chose this time...choose the other...this happened to me

 

[svtl919]

I checked the speakers and they were fine so I pulled the radio to check my wiring and guess what both the pos wires came apart lol what are the odds back up and running