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.
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HOMESERVICE MANUALSLEXUS1998SC 300REPAIR AND DIAGNOSISBODY & FRAMEMIRRORS - POWERTESTINGPOWER MIRROR POSITION SENSOR TEST (WITH MEMORY)LS400
1998 Lexus SC 300
Power Mirror Position Sensor Test (With Memory): LS400
1998 Lexus SC 300SECTION LS400
- Disconnect power mirror motor harness connector. Connect three 1.5-volt dry cell batteries together in series. See Fig 1. Connect dry cell positive lead to terminal No. 7 and negative lead to terminal No. 6. Connect positive lead of voltmeter to terminal No. 13 and negative lead to terminal No. 6.
- While watching voltmeter, apply battery voltage to terminals No. 10 and 11, reversing polarity as necessary to move mirror in both directions. As mirror moves, voltage should gradually and smoothly change from 0-.9 volt to 2.8-5.0 volts. If voltage is not as specified, replace power mirror. If voltage is as specified, go to next step.
- Disconnect voltmeter and battery voltage from motor connector terminals (leave dry cell assembly connected). Connect positive lead of voltmeter to terminal No. 14 and negative lead to terminal No. 6.
- Apply battery voltage between terminals No. 11 and 12, reversing polarity as necessary to move mirror in both directions. As mirror moves, voltage should gradually and smoothly change from 0-.9 volt to 2.8-5.0 volts. If voltage is not as specified, replace power mirror.
RENDER: 1.0x
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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.