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 LS 430FACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Miscellaneous
MISCELLANEOUS LOCATION
| Component | Component Location |
|---|---|
| Data Link Connector (DLC) No. 3 | Below left side of dash. See Figure. |
| Fuel Pump Resistor | On left side of engine compartment. |
| Ignition Coil & Ignitor (8) | Above each respective spark plug. |
| Junction Connectors No. 1, 2, 3, 4, 5 & 6 | Near engine control module, in protective case. |
| Junction Connector No. 7 | Below engine room No. 1 J/B & engine room No. 1 R/B. |
| Junction Connectors No. 8 & 9 | Behind left end of dash. |
| Junction Connectors No. 10, 11, 12, 13, 14, 15, 16 & 17 | Behind upper center of dash. |
| Junction Connectors No. 18, 19 & 20 | Behind upper right side of dash. |
| Junction Connector No. 21 | Forward of left rear fenderwell. |
| Junction Connectors No. 22 & 23 | Rearward of left rear fenderwell. |
| Junction Connectors No. 24 & 25 | On left rear of luggage compartment lid. |
| Junction Connector No. 26 | Near center of rear speaker shelf, at base of rear window. |
| Junction Connector No. 27 | Forward of right rear fenderwell. |
| Junction Connectors No. 28, 29 & 30 | Rearward of right rear fenderwell. |
| Junction Connector No. 31 | Behind left rear seat back. |
| Junction Connector No. 32 | Behind right rear seat back. |
| Noise Filter | On luggage room J/B. |
| Noise Filter (Ignition) (Left Bank) | On left rear of engine. See Figure. |
| Noise Filter (Ignition) (Right Bank) | On right front of engine. See Figure. |
| Noise Filter (Rear Window Defogger) | Behind left headlight. See Figure. |
| Pretensioner (Front) (Left/Right) | Near base of respective "B" pillar. |
| Pretensioner (Rear) (Left/Right) | Near base of respective "C" pillar. |
| Stereo Component Amplifier | On right side of luggage compartment, behind trim. See Figure. |
| Telephone Transceiver & Speaker Relay (W/Lexus Link System) | On right side of luggage compartment. See Figure. |
| Telephone Transceiver & Speaker Relay (W/O Lexus Link System) | On left side of luggage compartment. See Figure. |
| Theft Deterrent Horn | On right rear of engine compartment. See Figure. |
| Transponder Key Amplifier | On right side of steering column. See Figure. |
Factory Service Tools
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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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