
Audio issues after replacing radio head unit
I just installed a generic "Tesla Style" Android Auto/Apple Carplay head unit in my Cruze. Almost everything works except for most audio. I have a 2013 with the Pioneer audio package. My head unit doesn't seem to correctly interface with the harness's audio. FM radio works fine, but bluetooth/AA audio doesn't work. If I switch from FM to AA, then it will play for a few seconds, then cut out.
Here's my theory:
The head unit has a built-in amp that it uses with FM radio. For some reason, this doesn't work for BT. There's a 20-pin harness to RCA connectors for audio channels. If I use those to feed into the Pioneer amp, everything should work. The issue is the Pioneer amp uses proprietary connectors.
Does a harness exist to connect the factory Pioneer amp to an aftermarket radio? Has anyone done a head unit swap while keeping the Pioneer audio system and know for sure what's going on?
Edit: I forgot to mention I tried wiring the AMP wire on the harness adapter for the head unit to the AMP CONT wire on the 20-pin. That didn't work so I tried the constant power as recommended in this video, but that caused all audio to stop