Hi Tim, we are trying to stay proactive and get back to everyone so let see if I can help you out. If you want to know where the chimes and signa chime end you can set up a Multimeter up to the white and white black on the harness's (signal Side) and turn the radio down and the turn signal you should see a spike in voltage (AC) when the signal pings.
If this is in the harness up to the processor or amp, it could be that it is tuned out by a low pass filter or may be disabled in the hmi. The loop harness is dumb it is simply a fancy tap that extends your connection point and saves you time and money. Hope this helps !