I had this same exact problem. What I ended up doing was swapping around all the multiplex units with some extras that I had, and it seemed to have worked. Well, at least my taillights and my dash lights work. My front parking lights still don't work though, but that's not a big deal to me. Some one else who had this problem says that he took his aftermarket radio back out and then taped up all the loose wires, put it all back together and everything worked again