Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Light Failure Sensor Inspection
LIGHT FAILURE SENSOR TEST
| Terminal | Condition | Value |
|---|---|---|
| 1 | Always | Continuity |
| 2 | Always | Continuity |
| 3 | Always | Continuity |
| 5 | Always | Continuity |
| 9 | Always | Continuity |
| 11 | Always | Continuity |
| 3 | Light Control Switch Off | Zero Volts |
| 3 | Head Or Tail Lights On | Battery Voltage |
| 4 | Ignition; Lock Or ACC | Zero Volts |
| 4 | Ignition On | Battery Voltage |
| 7 | Stoplight Switch Off | Zero Volts |
| 7 | Stoplight Switch On | Battery Voltage |
| 8 | Ignition; Lock Or ACC | Zero Volts |
| 8 | Ignition On | Battery Voltage |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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