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 GS 430FACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Miscellaneous
MISCELLANEOUS LOCATION
| Component | Component Location |
|---|---|
| Data Link Connector (DLC) No. 1 (3.0L) | At left side of engine compartment, behind ECU box. See Figure. |
| Data Link Connector (DLC) No. 1 (4.3L) | At left side of engine compartment, behind ECU box. See Figure. |
| Data Link Connector (DLC) No. 3 | Behind left side of dash. |
| Daytime Running Light Resistor | On left side of left strut tower. |
| Diode (Daytime Running Light) | Behind right side of dash. |
| Diode (Luggage Compartment Door Open Detection) | At left side of luggage compartment. |
| Ignitor (3.0L) | On left rear of engine compartment. |
| Ignitor (4.3L) | At each individual ignition coil. |
| Junction Connectors No. 1, 2, 3 & 4 | In ECU box. |
| Junction Connector No. 5 | In engine room R/B No. 2. |
| Junction Connectors No. 6, 7 & 8 | Behind left kick panel. |
| Junction Connectors No. 9, 10, 11, 12, 13, 14 & 15 | Behind left side of dash. |
| Junction Connector No. 16 | Behind center of dash. |
| Junction Connector No. 17 | Behind upper right side of dash. |
| Junction Connector No. 18 | Behind right kick panel. |
| Junction Connectors No. 19 & 20 | Above left rear wheelwell. |
| Junction Connectors No. 21 & 22 | Above right rear wheelwell. |
| Junction Connector No. 23 | Under left front seat. |
| Junction Connector No. 24 | Under right front seat. |
| Junction Connector No. 27 | Behind left kick panel. |
| Junction Connector No. 28 | Above right rear wheelwell. |
| Noise Filter (2) | In passenger side J/B. |
| Noise Filter (High Mounted Stoplight) | At left front corner of luggage compartment. |
| Noise Filter (Ignition) (3.0L) | At top left front of engine. See Figure. |
| Noise Filter (Ignition No. 1) (4.3L) | On top right side of engine. |
| Noise Filter (Ignition No. 2) (4.3L) | At top left rear of engine. See Figure. |
| 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 | On left side of left strut tower. |
| Stereo Component Amplifier (Except Mark Levinson) | Behind right side of dash. See Figure. |
| Stereo Component Amplifier (Mark Levinson) | At right rear corner of luggage compartment. See Figure. |
| Telephone Transceiver & Speaker Relay | At right side of luggage compartment. See Figure. |
| Theft Deterrent Horn (3.0L) | At right front of engine compartment. See Figure. |
| Theft Deterrent Horn (4.3L) | At right front of engine compartment. See Figure. |
| Transponder Key Amplifier | In 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.