Electrical issues 2017 tacoma

Howdy yota folk. I'm having a few issues. Wondering if anybody else have had any experience with this....
1. Speakers work sometimes,( virgin factory wiring) other times theyll sound as if they are grounding out. (Scratchy and poppy)
2. 4wd is giving me an error on the display. (I here it activating, when I grab the front drive, I can feel that it is a engaging the 4wd. The problem is that the truck thinks that it isn't in 4wd drive. I can't get to the 4wd low goodies.
I think it's a grounding issue, wandering if anyone has any advice for me. Also wondering if anyone has a wiring diagram?
Thank You in advance!

 

First off, welcome to the forum. Does sound like your speaker wires are shorting out, check where the wires pass through the doors. As far as the 4 wheel activation, that sounds more like the computer not getting the word from the actuator.