GMC Sierra IV (2018-2022) Radio circuit, low level

AUDIO SIG MICROPHONE SIG BACKUP LAMP CONTROL BATT POS VOLT BK COAX XM/HD BK LVDS INFOTAINMENT DISPLAY SIG BK USB ANTENNA XM SIGNAL OG COAX COAX CAM SIG BLK/BRN WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/WHT WIRE BLU WIRE BLU/BLK WIRE BLU/GRN WIRE BLU/GRY WIRE BLU/RED WIRE BRN/BLU WIRE BRN/WHT WIRE BUTTON SIG CAMERA SIG (-) COAX COMPUTER DATA LINES SYSTEM CU COAX ANTENNA XM SIG DIMMING CTRL ETHERNET BUS 4 (-) GND SIG GRN WIRE GRN/BLK WIRE GRN/WHT WIRE GRY WIRE GRY/BLU WIRE GRY/BRN WIRE GRY/GRN WIRE GRY/VIO WIRE GRY/WHT WIRE GRY/YEL WIRE HOT AT ALL TIMES LEFT FRONT DOOR SPEAKER LEFT FRONT MOBILE TELEPHONE MICROPHONE LEFT INSTRUMENT PANEL SPEAKER LEFT REAR DOOR SPEAKER LF SPEAKER (-) CTRL 1 LF SPEAKER SIG (-) 1 LH RR SPEAKER CTRL (+) LH RR SPEAKER SIG (-) RADIO DISPLAY TOUCH INTERRUPT REQUEST SIG LO SPEED GMLAN DATA 2 LVDS NAVIGATION SYSTEM NCA WIRE PWR SIG RADIO RADIO DSPY BACKLIGHT LO REF RADIO KEYPAD VOLTAGE REF RED/WHT WIRE RED/YEL WIRE REPLICATED SIG RF SPEAKER (-) CTRL 1 RF SPEAKER SIG (-) 1 RH RR SPEAKER CTRL (+) AUDIO LO REF MICROPHONE LO REF RH RR SPEAKER SIG (-) RIGHT FRONT DOOR SPEAKER RIGHT INSTRUMENT PANEL FUSE BLOCK RIGHT INSTRUMENT PANEL SPEAKER RIGHT REAR DOOR SPEAKER USB USB RECEPTACLE VIO/BLU WIRE VIO/WHT WIRE VOLUME DOWN VOLUME UP W/ ONSTAR W/O ONSTAR WHT WIRE WHT/BLU WIRE YEL WIRE YEL/BLK WIRE

1-RD 2-RD 6.6L VIN 7 6.6L VIN Y TURBO DIESEL 6.6L VIN Y TURBO DIESEL BACK- WARD BACKLIGHT LO REF BLK/BLU WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/GRN WIRE BLU/GRY WIRE BLU/RED WIRE BRN/WHT WIRE CALL CELL CELLULAR PHONE NAVIGATION, DIGITAL RADIO ANTENNA COAX COMPUTER DATA LINES SYSTEM DIMMING CTRL DOWN ENGINE CONTROL MODULE FORWARD/ GPS/CELL GRY/BLU WIRE GRY/BRN WIRE GRY/VIO WIRE GRY/YEL WIRE HOME HOT AT ALL TIMES INFO DISPLAY MODULE LOGIC LOW REF 7 LVDS LVDS CABLE MUTE NAVI DISPLAY DIMMING CTRL NCA WIRE PNK WIRE RADIO CONTROLS RADIO DISPLAY TOUCH RADIO DSPY BACKLIGHT RADIO KEYPAD BUTTON SIG RADIO KEYPAD DIMMING CTRL RADIO KEYPAD LOW REF RADIO KEYPAD POWER SIG RADIO KEYPAD PWR SIG RADIO KEYPAD VOLT REF RADIO KEYPAD VOLTAGE REF RADIO PRESETS STEERING WHEEL CONTROLS SWITCH RADIO VOLUME DOWN SIG RADIO VOLUME STEERING WHEEL CONTROLS SWITCH RADIO VOLUME UP SIG RADIO, DISPLAY RED/YEL WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK RIGHT STEERING WHEEL CONTROLS SWITCH SEEK LEFT UP SEEK RIGHT/ SELECT TELEMATICS COMMUNICATION INTERFACE CONTROL MODULE VIO/BLU WIRE VIO/WHT WIRE VOICE VOICE RECOGNITION AUDIO LOW REF VOICE RECOGNITION AUDIO SIG W/ DIGITAL AUDIO SYSTEM W/ ONSTAR WHT/YEL WIRE YEL/BLU WIRE