Lexus GS III (2004-2007) Back-up lamps circuit

BACK-UP LIGHT SWITCH DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) GAUGE FUSE HOT IN ON OR START JUNCTION CONNECTOR 1 (IN ECU BOX) JUNCTION CONNECTOR 17 (BEHIND UPPER RIGHT SIDE OF DASH) JUNCTION CONNECTOR 19 (ABOVE LEFT REAR WHEELWELL) JUNCTION CONNECTOR 20 (ABOVE LEFT REAR WHEELWELL) JUNCTION CONNECTOR 27 (BEHIND LEFT KICK PANEL) JUNCTION CONNECTOR 3, 4 (IN ECU BOX) LEFT REAR COMBINATION LIGHT BACK-UP LIGHT PARK/NEUTRAL POSITION SWITCH (ON TRANSMISSION) RED (OR GRN) WIRE RED WIRE RED/BLK WIRE RED/BLU (OR RED) WIRE RED/BLU WIRE RIGHT REAR COMBINATION LIGHT BACK-UP LIGHT WHT/BLK WIRE