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.
2004 Lexus RX 330 AWDFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| AFS ECU | Left side of dash. See Figure. |
| Auto Wiper ECU | Top right side of dash. See Figure. |
| Blower Motor Controller | Right side of dash. See Figure. |
| Body ECU | Behind left side of dash. See Figure. |
| Cooling Fan ECU | Left front of engine compartment. See Figure. |
| Distance Control ECU | Left side of dash. See Figure. |
| Door Control Receiver | Top of left "D" pillar. See Figure. |
| Engine Control Module | Behind right side of dash. See Figure. |
| Gateway ECU | Right side of dash. See Figure. |
| Headlight Beam Level Control ECU | Behind left end of dash. See Figure. |
| Mayday ECU | Left rear of vehicle. See Figure. |
| Moon Roof Control ECU (Multi Panel Type Moon Roof) | Front center of roof. See Figure. |
| Moon Roof Control ECU (Normal Type Moon Roof) | On front center of moon roof. See Figure. |
| Navigation ECU | At rear of cargo area. See Figure. |
| Occupant Classification ECU | At right front seat. See Figure. |
| Power Back Door Drive Unit | Right side of dash. See Figure. |
| Power Back Door ECU | Center of left "D" pillar. See Figure. |
| Power Seat ECU (Driver's Seat) | Under driver's seat. See Figure. |
| Rear Seat Entertainment ECU | In right rear of cargo area. See Figure. |
| Remote Control Mirror ECU LH | In left front door. See Figure. |
| Remote Control Mirror ECU RH | In right front door. See Figure. |
| Shift Lock ECU | Under center console, beside shift lever. See Figure. |
| Skid Control ECU W/Actuator | Right front of engine compartment. See Figure. |
| Suspension Control ECU | Under right side of dash. See Figure. |
| Television Camera ECU | Right rear of cargo area. See Figure. |
| Tilt & Telescopic ECU | At base of steering column. See Figure. |
| Transponder Key Computer | Center of dash. See Figure. |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.