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.
2003 Lexus SC 430FACTORY OEM SERVICE PROCEDURE
Section 55 (Body Control System)
WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
- Description & Operation
- Component Locations
- Trouble Shooting
- Self-Diagnostic System
- Connector Identification
- Circuit Tests
- Anti-Theft Horn Circuit
- Anti-Theft Indicator Circuit
- Back Door Lock & Unlock Switch Circuit
- Driver Buckle Switch Circuit
- Engine Hood Courtesy Switch Circuit
- Hazard Switch Circuit
- Headlight Relay Circuit
- Horn Circuit
- Illumination Circuit
- Key Unlock Warning Switch Circuit
- Light Control Switch Circuit
- Parking Brake Switch Circuit
- Power Source Circuit
- Rear Interior Light & Back Door Courtesy Switch Circuit
- Stop Light Switch Circuit
- Taillight Relay Circuit
- Wireless Door Lock Buzzer Circuit
- Wireless Door Lock Tuner Circuit
- Component Tests
- Pin Voltage Tests
- Removal & Installation
- Wiring Diagrams
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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