Brakes lights and cruise control are not working?

2003 GMC SIERRA
110,000 MILES • V8 • 2WD • AUTOMATIC
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MBARR2012
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I only have a cab third brake light that works. The others do not work, including the camper shell third brake light. I have turn signals. I have checked fuses all are fine and not busted. I have also checked the bulbs as well, and they are fine. Also, my cruise control does not work either. Everything had worked before just fine. What would you guys suggest? Where would the issue begin?
Jul 27, 2023 at 4:18 PM
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STRAILER
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It sounds like the multifunction switch has gone bad here is how to change it out to fix the problem. Check out the images (below). Please let us know how it goes.
Jul 28, 2023 at 12:14 PM