Did you use the Metra adapters? They are wired backwards resulting in reversed polarity. That may result in the system thinking there is an issue and shutting the rear speakers down.
Good deal. Went all through mine, and can't find a thing wrong. Speakers are just not getting signal. Gonna have to take it into the shop that did the install that I told I'd never do business again regarding another issue I had with them.
What part of WV are you in?