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.
1990 Lexus ES 250 AutomaticFACTORY OEM SERVICE PROCEDURE
Circuit Opening Relay
- Turn ignition off. Remove relay from vehicle. Using a DVOM, check for continuity between relay terminals STA and E1. See Fig 1. Check for continuity between terminals B and FC. Ensure there is no continuity between B and FP. If continuity is not as specified, replace relay.
- Apply battery voltage between terminals STA and E1. Using a DVOM, ensure continuity is present between terminals B and FP. Apply battery voltage between terminals B and FC. Ensure continuity is present between terminals B and FP. If continuity is not as specified, replace relay.
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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