So I thought only my LED 3rd brake light had broken, but when I went to use my rear defroster tonight, I realized that also doesn't work.

When I press the rear defrost button, it blinks 3 times and then goes off.

My stop lamps, backup lights, directionals, and headlights all work just fine but the 3rd brake light (back window high mounted) does not work...

I'm wondering if the high mounted 3rd brake light and rear defrost both not working are possibly connected.

 

Check for a bad ground.