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 MANUALSLEXUS1999SC 400REPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - A-650ECOMPONENT TESTSPATTERN SELECT SWITCH CIRCUIT
1999 Lexus SC 400
Pattern Select Switch Circuit
1999 Lexus SC 400SECTION Pattern Select Switch Circuit
Disconnect pattern select connector. Using ohmmeter, check continuity between specified terminals. See PATTERN SELECT SWITCH CONTINUITY table. Replace switch as needed.
PATTERN SELECT SWITCH CONTINUITY
| Switch Position | Terminals No. | Continuity | ||||||
|---|---|---|---|---|---|---|---|---|
| GS300 & GS400 (1) | ||||||||
| PWR | 3 & 7 | Continuity | ||||||
| NORM | 1 & 3; 3 & 7 | No Continuity | ||||||
| SNOW | 1 & 3 | Continuity | ||||||
| LS400 (2) | ||||||||
| With Air Suspension | ||||||||
| PWR | 3 & 4 | Continuity | ||||||
| NORM | 3 & 4; 3 & 5 | No Continuity | ||||||
| SNOW | 3 & 5 | Continuity | ||||||
| Without Air Suspension | ||||||||
| PWR | 1 & 4 | Continuity | ||||||
| NORM | 1 & 4, 3 & 4 | No Continuity | ||||||
| SNOW | 3 & 4 | Continuity | ||||||
| SC400 (2) | ||||||||
| PWR | 1 & 4 | Continuity | ||||||
| NORM | 1 & 4, 4 & 5 | No Continuity | ||||||
| SNOW | 4 & 5 | Continuity | ||||||
|
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RENDER: 1.0x
NO RELATED
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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.