Just wanted to post a fix i found.

recently my g37 would not output any sound, the radio turns on and works but theres no sound

first thing i suggest doing is checking your fuse box next to the brake pedal, check if your BOSE 15A fuse is blown, if thats the case replace it.

if you replace it and there still is no sound, that means your amplifier has gone out, get one from a junkyard for 20$ and there you go, sound back, and also louder🙏

sorry if my grammar is bad, english is not my first language