Door Subs No Worky....

installed the Shelby Kicker upgrade package awhile back.....not sure if this happened when installed or since the install, but my door subs arent working at all. im trying to go through the wiring but when it comes to electrical crap i stink!!! everything was plug and play so i dont know???? i had a H/U installed also but that well over 2 months prior to the Shelby upgrade and i know the speakers worked then....i cant really take it to a shop since im in Germany and i dont trust anybody here, i could wait a month until i do finally return stateside but its annoying the hell out of me that they arent working.............any advice???