Buick Envision I (2016-2018) Trailer tow circuit

BATTERY FUSE BLOCK BLK WIRE BLU WIRE BLU/VIO WIRE BLU/WHT WIRE BODY CONTROL MODULE BRN WIRE COMPUTER DATA LINES SYSTEM FUSE 4 GRN WIRE GRN/VIO WIRE GRY/BRN WIRE HOT AT ALL TIMES HOT W/ PARK LAMPS RELAY ENERGIZED LEFT TRAILER STOP/ TURN SIGNAL LAMP RELAY LR TURN SIG LP CTRL RED/GRN WIRE RIGHT TRAILER STOP/ TURN SIGNAL LAMP RELAY RR TURN SIG LP CTRL SERIAL DATA (-) (1) TRAILER CONNECTOR TRLR LT TRN FUSE TRLR PRK FUSE TRLR RT TRN FUSE WHT WIRE YEL WIRE YEL/GRY WIRE