GMC Sierra III facelift (2015-2018) Electronic muffler circuit

A/C CMPRSR MDL/BATT RVC FUSE BATT POS VOLT BLK WIRE BODY CONTROL MODULE COMPUTER DATA LINES SYSTEM DRIVER INFORMATION CENTER DISPLAY EXHAUST BRAKE IND EXHAUST BRK SW CTRL EXHAUST BRK SW SIG GRN/WHT WIRE GRN/YEL WIRE GRY/GRN WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER INSTRUMENT PANEL MULTI- FUNCTION SWITCH LOGIC LOW SPD GMLAN RED/YEL WIRE SER DATA UNDERHOOD FUSE BLOCK WHT WIRE