Flyineyeball

Same type of intermittent on/off in driver's area, craziness with warning lights DIC-panel, cruise control not working, driver seat adjusts only when no weight on it, video screen junque, even radio flaky. 2007 Yukon 6.2. New brake light switch fixed cruise control. They're linked. Found videos on You Tube saying worst ground connection may be strap from engine to black hole down firewall. They added an 8 or 6 gauge ground wire from engine block near alternator to cleaned connection on firewall at top of strap. Seat only thing not fixed. Clean and lube rail, clean all electrical? Your situation may respond differently. Hope this helps.