Radio Harness:
- Pin 1: Black - Ground
- Pin 2: Gray - Left Front Speaker Negative
- Pin 3: Gray/black - Left Front Speaker Positive
- Pin 4: Green/black - Right Front Speaker Positive
- Pin 5: Green - Right Front Speaker Negative
- Pin 6: Violet/black - Left Rear Speaker Positive
- Pin 7: Violet - Left Rear Speaker Negative
- Pin 8: Brown/black - Right Rear Speaker Positive
- Pin 9: Brown - Right Rear Speaker Negative
- Pin 10: Red - Accessory Power
- Pin 11: Yellow - Battery Power
- Pin 12: Blue/white - Antenna Trigger
Amplifier Harness:
- Pin 1: Black - Ground
- Pin 2: Blue/white - Amplifier Turn On
- Pin 3: Violet - Left Rear Speaker
- Pin 4: Violet/black - Left Rear Speaker
- Pin 5: Green - Right Rear Speaker Negative
- Pin 6: Green/black - Right Rear Speaker Positive
- Pin 7: Brown - Right Front Speaker Negative
- Pin 8: Brown/black - Right Front Speaker Positive
- Pin 9: Gray - Left Front Speaker Negative
- Pin 10: Gray/black - Left Front Speaker Positive
Note: The wiring colors may vary depending on the year and model of the Lexus SC400. It's always best to refer to the vehicle's specific wiring diagram to ensure accuracy.**
