Did you ever find resolution to this issue? I have a similar predicament; installed LLJ loopback harness with audio control amp ~8 months ago; everything worked great. I just installed the WAMS radio upgrade and everything works, except now I have no turn signal/chimes sounds. Everything else works. I unplugged the loopback harness and reconnected factory plugs and I had turn signal sound again. I also noticed that if I get in and just turn on the ACC and don't start the motor the hazards make sound, but as soon as I start the motor, silence.