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: Splices
SPLICES LOCATION
| Component | Component Location |
|---|---|
| B1 | In body harness, at top of left "A" pillar. |
| B2 | In body harness, at top of right "A" pillar. |
| B3 | In body harness, in front of left rear wheelwell. |
| B4 | In body harness, at top rear of left rear wheelwell. |
| B5 | In body harness, at left front of luggage compartment floor. |
| B6 | In body harness, in left front seat. |
| E1 (3.0L) | In engine harness, at front of engine. See Figure. |
| E1 (4.3L) | In engine harness, at right rear top of engine. See Figure. |
| E2 (3.0L) | In engine harness, at left rear top of engine. See Figure. |
| E2 (4.3L) | In engine harness, at left rear top of engine. See Figure. |
| E3 (3.0L) | In engine harness, inside of ECU box. See Figure. |
| E3 (4.3L) | In engine harness, inside of ECU box. See Figure. |
| E4 (3.0L) | In engine harness, inside of ECU box. See Figure. |
| E4 (4.3L) | In engine harness, inside of ECU box. See Figure. |
| I1 | In dash harness, behind instrument cluster. |
| I2 | In dash harness, under center air vents. |
| I3 | In dash harness, right of center air vents. |
| I4 | In dash harness, behind left side of glove box. |
| I5 | In dash harness, behind center of glove box. |
| I6 | In dash harness, behind right side of glove box. |
| I7 | In dash harness, behind right kick panel. |
| I8 | In dash harness, at base of right kick panel. |
| I9 | In dash harness, behind left side of dash. |
| I10 | In dash harness, behind left side of instrument cluster. |
| I11 | In dash harness, behind left side of dash. |
| I12 | In dash harness, behind right side of instrument cluster. |
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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