Scotty, I recently got a 2011 Toyota Tundra V8 with @215,000 Recently after putting heater into "auto" it started turning on and off the blower motor on max and its locked in hot. The aftermarket Tesla type screen shows the correct status as it bounces between off and max, but the power and fan buttons will not work. I pulled the negative cable and reinstalled it. It stopped bouncing from off to on, but after I turned it to auto again it started turning off and on again. I factory reset the screen and as it was rebooting the HVAC kept going from off to on so I think that rules out the screen. What would cause this problem, and how can I DIY it?