Two problems related to tail light switch have been reported for the 2007 Chevrolet Trailblazer. The most recently reported issues are listed below.
I have no low beam light or daytime running lights. I do have side marker lights along with turn signal and tail lights. The problem started on 12/2015 and again on 03/14/2016.
This has happened a couple of times before while I was driving at night (fortunately in well lit areas), I thought I had inadvertently turned the headlights off. When I turned the headlights off then back on the low beams came on. Last night I came out of the grocery store and noticed my headlights did not come on when I used the remote entry to unlock the door. It took a few moments to realize my low beams were still not on once I started the vehicle and put it in drive. My hi beams, parking lights and tail lights are all working. Twenty-four hours my low beams still are not working.