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Tail lights 2012 GMC Acadia

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 ?