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.
1998 Lexus SC 300FACTORY OEM SERVICE PROCEDURE
Integration Relay
- Disconnect 12-pin relay connector. Connect positive lead from battery to relay terminals No. 1 and 7. Connect 3.4-watt bulb between terminals No. 7 and 9. Connect negative lead from battery to terminal No. 10. Perform STEP 1. See Fig 1. Bulb should light and buzzer should sound for 4-8 seconds.
- Repeat step 1, but connect negative lead from battery to terminal No. 8 while light and buzzer are on. Perform STEP 2. See Fig 1. Buzzer should stop. Replace integration relay if it does not test as specified.
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.