interior lights impala 2000

hawaii51

Headliner lights, rear view mirror light, trunk light, all not work, even when switch on at manual switch. Fuse checked and replaced. How do I go about checking connections?

hawaii51

Also determined that remote / keyless entry not work, but I never use that. Can't tell if the remote not working is coupled with same root cause as interior lights.

I could really use some guidance on how to troubleshoot this.