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
Control Units
CONTROL UNITS LOCATION
| Component | Component Location |
|---|---|
| Absorber Control ECU | Behind left end of dash. See Figure. |
| A/C Control Assembly | Behind center of dash. |
| Blower Motor Controller | Behind right side of dash. |
| Body ECU | Attached to driver side J/B. See Figure. |
| Door Lock Control Receiver | At right "C" pillar. |
| Driver Door ECU | In middle of left front door. See Figure. |
| Engine Control Module | Behind right side of dash. See Figure. |
| Front Passenger Door ECU | In middle of right front door. See Figure. |
| Headlight Beam Level Control ECU | Behind lower center of dash. See Figure. |
| Headlight Control ECU (Left/Right) | Behind respective headlight. |
| Memory Mirror ECU | Behind lower center of dash. See Figure. |
| Memory Seat ECU | Below left front seat. |
| Moon Roof Control ECU & Motor | At center front of roof. See Figure. |
| Navigation ECU | At left side of luggage compartment. See Figure. |
| Rear Door ECU (Left) | In middle of left rear door. See Figure. |
| Rear Door ECU (Right) | In middle of right rear door. See Figure. |
| Shift Lock Control ECU | Under center floor console. See Figure. |
| Skid Control ECU | Behind right side of dash. See Figure. |
| Skid Control ECU W/Actuator (W/VSC) | At right side of engine compartment. See Figure. |
| Stereo Component Amplifier (Except Mark Levinson) | Behind right side of dash. See Figure. |
| Stereo Component Amplifier (Mark Levinson) | On right side of luggage compartment. See Figure. |
| Telephone Computer | On left side of luggage compartment. See Figure. |
| Theft Deterrent ECU | Behind right side of dash. See Figure. |
| Transponder Key Amplifier | On right side of steering column. See Figure. |
| TVIP ECU | Behind right side of dash. |
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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