Lexus GS II (1997-2000) Back-up lamps circuit

3.0L, 4.0L AD BF BACK-UP DRIVER SIDE JUNCTION BLOCK (BEHIND LOWER LEFT END OF DASH) GAUGE FUSE HOT IN RUN OR START JUNCTION CONNECTOR J/C 1 (UNDER ECU BOX) JUNCTION CONNECTOR J/C 19 (TOP OF LEFT REAR WHEELWELL) JUNCTION CONNECTOR J/C 20 (UNDER LEFT C-PILLAR) JUNCTION CONNECTOR J/C 3, 4 (UNDER ECU BOX) LEFT REAR COMBINATION LIGHT (INNER) BACK- UP PARK/NEUTRAL POSITION SWITCH (ON TRANSMISSION) RED WIRE RED/BLK WIRE RED/BLU WIRE RIGHT REAR COMBINATION LIGHT (INNER) WHT/BLK WIRE