Hey guys, I was able to grab a 2018 head unit and i swapped it into my 2017 G80 5.0 Ultimate, recreating the same no sound issue that we know and love. My dad decided we should get an
aftermarket amp with dsp and connect it to get audio, essentially bypassing the oem amp. So I took it to a shop and they installed the amp, but still no audio. My dad said it needs to be connected to the speaker level and not the remote (no clue what that means) and we told the guys, they didn’t seem to know what that is either. No audio came out but the beeping worked, and so did the parking sensors.
Apple carplay worked flawlessly, even if I plug it in after turning the car on. They put the old head unit back in, and although i can hear the speakers on (they’re buzzing, making weird high pitched frequencies) no audio comes out of them. Only the middle speaker (on the dash) and the rear speakers (behind the rear seats) and the sub in the trunk. Also, blind spot sounds and parking sensor sounds aren’t working anymore. Any suggestions on anything else to do? We’re close but far. If all else fails, I’m requiring back to stock until we find another solution.