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.
1999 Lexus SC 300FACTORY OEM SERVICE PROCEDURE
Diode Assembly
- Place diode (rectifier) assembly on bench. Connect ohmmeter positive lead to positive (+) terminal and negative lead to each rectifier terminal. See Fig 1. Reverse ohmmeter leads and check again. Continuity should exist in only one direction.
- Connect ohmmeter positive lead to each rectifier terminal and negative lead to each negative (-) terminal. Reverse ohmmeter leads and check again. Continuity should exist in only one direction. If continuity is not as specified, replace diode assembly.
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.
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