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.
1998 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Switches
SWITCHES
| Component | Component Location |
|---|---|
| A/C Dual Pressure Switch (W/ Traction Control) (3.0L) | At right side of engine compartment, near strut tower. See Figure. |
| A/C Dual Pressure Switch (W/O Traction Control) (3.0L) | At right side of engine compartment, near strut tower. See Figure. |
| A/C Dual Pressure Switch (4.0L) | At right side of engine compartment, integral to A/C triple pressure switch. |
| A/C Single Pressure Switch (4.0L) | At right side of engine compartment, integral to A/C triple pressure switch. |
| A/C Triple Pressure Switch (W/ Traction Control) (4.0L) | At right side of engine compartment, near strut tower. See Figure. |
| A/C Triple Pressure Switch (W/O Traction Control) (4.0L) | At right side of engine compartment, near strut tower. See Figure. |
| A/T Indicator Switch | On transmission, integral to park/neutral position switch. |
| Back-Up Light Switch | On transmission, integral to park/neutral position switch. |
| Brake Fluid Level Switch (3.0L) | In brake fluid reservoir. See Figure. |
| Brake Fluid Level Switch (4.0L) | In brake fluid reservoir. See Figure. |
| Buckle Switch (Left/Right) | In respective front seat belt buckle. |
| Engine Oil Level Warning Switch (3.0L) | On left rear side of engine. See Figure. |
| Engine Oil Level Warning Switch (4.0L) | On left side of engine. See Figure. |
| Moon Roof Motor & Limit Switch | In front of moon roof opening. |
| Oil Pressure Switch (3.0L) | On left front side of engine. See Figure. |
| Oil Pressure Switch (4.0L) | On left front of engine. See Figure. |
| Parking Brake Switch | At base of parking brake lever. |
| Park/Neutral Position Switch (3.0L) | On transmission. See Figure. |
| Park/Neutral Position Switch (4.0L) | On transmission. See Figure. |
| Power Steering Oil Pressure Switch (3.0L) | At left front of engine. See Figure. |
| Shift Lock ECU & Transmission Control Switch | Under center console, near selector lever. See Figure. |
| Stoplight Switch | On bracket, above brake pedal. |
| Washer Level Switch (3.0L) | At left front corner of engine compartment. See Figure. |
| Washer Level Switch (4.0L) | At left front corner of engine compartment. See Figure. |
Factory Service Tools
Use the Manual With the Right Hardware
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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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