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.
1997 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Integration Relay Circuit
Check integration relay circuit for voltage and continuity. See INTEGRATION RELAY CIRCUIT TEST table. See Fig 1. Repair as necessary.
INTEGRATION RELAY CIRCUIT TEST
| Terminal | Condition | Value |
|---|---|---|
| A1 | Always | Battery Voltage |
| A5 | Ignition Key Out | No Continuity |
| A5 | Ignition Key In | Continuity |
| A6 | Driver Door Closed | No Continuity |
| A6 | Driver Door Open | Continuity |
| A7 | Ignition Off Or Acc | No Voltage |
| A7 | Ignition On | Battery Voltage |
| A8 | Driver Seat Belt Unfastened | No Continuity |
| A8 | Driver Seat Belt Fastened | Continuity |
| A9 | Ignition Off Or Acc | No Voltage |
| A9 | Ignition On | Battery Voltage |
| A10 | Always | Continuity |
Factory Service Tools
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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.