GMC Sierra IV (2018-2022) Electronic muffler circuit

BATT POS VOLT BATTERY FUSE BLOCK BLK WIRE BODY CONTROL MODULE EXHAUST BRK SW CTRL EXHAUST BRK SW SIG GRN/WHT WIRE GRN/YEL WIRE HOT AT ALL TIMES LEFT INSTRUMENT PANEL CENTER ACCESSORY FUNCTION SWITCH RED WIRE RED/YEL WIRE WHT WIRE YEL WIRE