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.
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HOMESERVICE MANUALSLEXUS2004IS 300 BASE, AUTOMATICREPAIR AND DIAGNOSISQUICK LOOKUPSELECTRICAL COMPONENT LOCATIONSELECTRICAL COMPONENT LOCATORCONTROL UNITS
2004 Lexus IS 300 Base, Automatic
Control Units
2004 Lexus IS 300 Base, AutomaticSECTION Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| A/C Control Assembly | Center of dashboard. See Figure. |
| Blower Motor Controller | Behind upper right center of dash. See Figure. |
| Body ECU | Behind lower left end of dash, integral with driver side J/B. See Figure. |
| Center Air Bag Sensor Assembly | Below center of dash, on transmission tunnel. See Figure. |
| Engine Control Module | On left front of engine compartment, in protective case. See Figure. |
| Headlight Beam Level Control ECU | Behind left end of dash. See Figure. |
| Headlight Control ECU (Left) | Behind left headlight assembly. See Figure. |
| Headlight Control ECU (Right) | Behind right headlight assembly. See Figure. |
| Moon Roof Control ECU (Sedan) | On front center of roof. See Figure. |
| Moon Roof Control ECU (Wagon) | On front center of roof. See Figure. |
| Navigation ECU (Sedan) | Rear of luggage compartment. See Figure. |
| Navigation ECU (Wagon) | Rear center of luggage compartment. See Figure. |
| Power Seat ECU (Left) | Below left front seat. See Figure. |
| Power Seat ECU (Right) | Below right front seat. See Figure. |
| Shift Lock Control ECU | Below right side of transmission shift lever. See Figure. |
| Skid Control ECU | Left end of dash. See Figure. |
| Theft Deterrent ECU | Behind left end of dash. See Figure. |
| Wireless Door Lock Control Receiver (Sedan) | Below center of rear window, on speaker shelf. See Figure. |
| Wireless Door Lock Control Receiver (Wagon) | Right rear of vehicle. See Figure. |
RENDER: 1.0x
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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.