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 ES 300FACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Connectors
CONNECTORS LOCATION
| Component | Component Location |
|---|---|
| BA1 (White, 11 Pin) | At left center pillar. |
| BB1 (White, 11 Pin) | At right center pillar. |
| BC1 (White, 9 Pin) | Behind right rear seat. |
| BD1 (White, 20 Pin) | Under driver's seat. |
| BE1 (White, 7 Pin) | Under front passenger's seat. |
| EA1 (Black, 4 Pin) | Behind left headlight. See Figure. |
| EA2 (Gray, 4 Pin) | Behind left headlight. See Figure. |
| EB1 (Dark Gray, 4 Pin) | Left bank of cylinder head. See Figure. |
| IA1 (White, 9 Pin) | At left kick panel. |
| IA2 (Gray, 10 Pin) | At left kick panel. |
| IA3 (White, 12 Pin) | At left kick panel. See Figure. |
| IA4 (White, 18 Pin) | At left kick panel. See Figure. |
| IB1 (White, 20 Pin) | At left kick panel. |
| IC1 (Blue, 13 Pin) | At left kick panel. |
| ID1 (White, 20 Pin) | At left side of driver side J/B. |
| IE1 (White, 13 Pin) | Lower part of left front pillar. See Figure. |
| IF1 (Yellow, 4 Pin) | Right side of steering column tube. |
| IF2 (Gray, 18 Pin) | Right side of steering column tube. |
| IF3 (White, 3 Pin) | Right side of steering column tube. |
| IF4 (Gray, 22 Pin) | Right side of steering column tube. See Figure. |
| IF5 (Blue, 9 Pin) | Right side of steering column tube. See Figure. |
| IF6 (White, 10 Pin) | Right side of steering column tube. |
| IF7 (Blue, 13 Pin) | Right side of steering column tube. See Figure. |
| IF8 (White, 11 Pin) | Right side of steering column tube. |
| IG1 (White, 10 Pin) | At dash brace, left side. |
| IH1 (Blue, 10 Pin) | Behind A/C control assembly. See Figure. |
| II1 (White, 10 Pin) | Behind A/C control assembly. |
| IJ1 (White, 3 Pin) | At left side of A/C unit. |
| IK1 (White, 10 Pin) | At dash reinforcement, right side. |
| IL1 (White, 22 Pin) | Behind glove box. |
| IL2 (Gray, 11 Pin) | Behind glove box. |
| IM1 (White, 10 Pin) | Behind glove box. |
| IN1 (White, 9 Pin) | At right kick panel. |
| IO1 (White, 4 Pin) | At right kick panel. |
| IO2 (Gray, 10 Pin) | At right kick panel. See Figure. |
| IO3 (White, 11 Pin) | At right kick panel. |
| IO4 (White, 12 Pin) | At right kick panel. See Figure. |
| IO5 (White, 18 Pin) | At right kick panel. See Figure. |
| IP1 (White, 20 Pin) | At right kick panel. |
| IP2 (Blue, 13 Pin) | At right kick panel. |
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.