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.
2009 Lexus IS 350FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Airbag Sensor Assembly Center | Under center console. See Figure. |
| Body ECU | Right & left ends of dash. See Figure. |
| Certification ECU | Right side of trunk. See Figure. |
| Clearance Warning ECU | Left side of trunk. See Figure. |
| Distance Control ECU | Left side of dash. See Figure. |
| Engine Control Module | Left front of engine compartment. See Figure. |
| Gateway ECU | Right end of dash. See Figure. |
| Headlamp Swivel ECU | Left kick panel. See Figure. |
| Injector Driver (EDU) | Front of engine compartment. See Figure. |
| Occupant Classification ECU | Under front passenger's seat. See Figure. |
| Outer Mirror Control ECU | Left & right front doors. See Figure. |
| Position Control ECU & SW (Left) | Under driver's seat. See Figure. |
| Position Control ECU & SW (Right) | Under front passenger's seat. See Figure. |
| Power Source Control ECU | Right side of dash. See Figure. |
| Power Steering ECU | Right rear of engine compartment. See Figure. |
| Seat Belt Control ECU | Left side of trunk. See Figure. |
| Shift Lock Control ECU | Under center console. See Figure. |
| Skid Control ECU With Actuator | Left rear of engine compartment. See Figure. |
| Sliding Roof Control ECU | Center front of roof. See Figure. |
| Steering Lock ECU | Steering column. See Figure. |
| Tilt & Telescopic ECU | On steering column. See Figure. |
| Tire Pressure Warning ECU | Center of dash. See Figure. |
| 4WD Control ECU | Right kick panel. See Figure. |
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.
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