Hi! My rear lights aren’t working. 2012 GMC Acadia. My break lights work and when I put the car in reverse the white lights work but when I’m driving at night they are not working.
I’ve seen a faulty multi-function switch cause this.
https://www.rockauto.com/en/moreinfo.php?pk=3447369&cc=1502009&jsn=426
Tester
Have you put new bulbs in to see if that is the problem ?