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 & FRAMEPOWER WINDOWSCOMPONENT TESTSMASTER SWITCH
1998 Lexus SC 300
Master Switch
1998 Lexus SC 300SECTION Master Switch
Remove master switch. Check for continuity between specified terminals of master switch. See MASTER SWITCH CONTINUITY TEST table. Also, see Fig 1. If continuity is not as specified, replace master switch.
MASTER SWITCH CONTINUITY TEST
| Window Switch & Position | Window Lock Switch Position | Pin Nos. | |||
|---|---|---|---|---|---|
| Driver's Switch | |||||
| Off (Neutral) | (1) | 8 & 9; 8 & 10 | |||
| Up | (1) | 4 & 10; 8 & 9 | |||
| Down | (1) | 4 & 9; 8 & 10 | |||
| Passenger's Switch | |||||
| Off (Neutral) | Unlock | 5 & 8; 7 & 8 | |||
| Lock | 5 & 7 | ||||
| Up | Unlock | 4 & 5; 7 & 8 | |||
| Lock | 4 & 5 | ||||
| Down | Unlock | 4 & 7; 5 & 8 | |||
| Lock | 4 & 7 | ||||
|
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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.