tarringt

I actually contacted LLJ directly several months back and got no response but figured it out after also contacting WAMS, Kicker, and AudioControl. There was a change from the 19-20 to 2021+ ios radios (and maybe other variants). 21+ require a load generating device/resistor for the radio to see everything as normal and chimes to function. I contacted kicker after seeing they changed the GM factory sub add on part number. The change was the addition of an inline resistor to their harness. Hope this helps.

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.