Have a 2004 Acura TL. Navigation screen has light behind it but screen is black. Only mid range speakers work. Very quiet. Had new speakers put in today. They don’t work. Thought maybe the speakers were just blown because I’ve owned older gm vehicles with speakers that didn’t work because of age but I replaced them and they were fine. Looked at the back of radio the other day and seemed like everything was plugged in. Factory remote for unlock and lock doesn’t work but lights up when you hit buttons and has new battery. Only rear door locks have power. Any suggestions?

 

Different issues. I'm taking an educated guess here, but:

Factory nav screen is going bad.
​​​​​Amplifier capacitors are bad.
Lock actuators are bad.

​​​​​​​All discussed on this forum.