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
Electrical Component Locator: Miscellaneous
MISCELLANEOUS LOCATION
| Component | Component Location |
|---|---|
| Data Link Connector (DLC) No. 1 | At left side of engine compartment, behind ECU box. |
| Data Link Connector (DLC) No. 3 | Behind left side of dash. See Figure. |
| Diode (Luggage Compartment Door Open Detection) | At left side of luggage compartment. |
| Fuel Pump Resistor | At left rear of engine compartment. See Figure. |
| Ignitor | At each individual ignition coil. |
| Junction Connectors No. 1, 2 & 3 | In engine room No. 2 R/B. |
| Junction Connectors No. 4, 5, 6 & 7 | In ECU box. |
| Junction Connector No. 8 | Behind left end of dash. |
| Junction Connectors No. 9 & 10 | Behind top left end of dash. |
| Junction Connector No. 11 | Behind center of dash, below radio. |
| Junction Connectors No. 12, 13 & 14 | Behind right side of dash. |
| Navigation Amplifier | At right rear corner of luggage compartment. |
| Noise Filter (2) | In passenger's side J/B. |
| Noise Filter (High Mounted Stoplight) | At left front corner of luggage compartment. |
| Noise Filter (Ignition No. 1) | On top right side of engine. |
| Noise Filter (Ignition No. 2) | At top left rear of engine. |
| Noise Filter (Rear Window Defogger) | At left front corner of luggage compartment. |
| Noise Filter (Stoplight) | At left front corner of luggage compartment. |
| Pretensioner (Left/Right) | At base of respective "B" pillar. |
| Short Connector | At rear center of luggage compartment. |
| Stereo Component Amplifier | At right rear corner of luggage compartment. See Figure. |
| Telephone Microphone Amplifier | Behind right end of dash. See Figure. |
| Theft Deterrent Horn | At right front of engine compartment. |
| Tire Pressure Antenna (Front) (Left/Right) | At respective front wheelwell. |
| Tire Pressure Antenna (Rear) (Left/Right) | At respective rear side of luggage compartment. |
| Transponder Key Amplifier | Behind dash, right of steering column. 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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