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 LS 430FACTORY OEM SERVICE PROCEDURE
Component Locations
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
COMPONENT LOCATIONS
| Component | Location |
|---|---|
| Active Light Relay | Behind Left Side Of Instrument Panel |
| Body Control Electronic Control Unit | Attached To Driver Side Junction Block |
| Brake Fluid Level Switch | On Brake Master Cylinder Reservoir |
| Door Courtesy Switch | In Door Pillar Post |
| Driver Side Junction Block | Left Side Of Instrument Panel, Behind Access Panel To Left Of Steering Column |
| ECU-ACC Fuse | Driver Side Junction Block |
| ECU-B Fuse | Driver Side Junction Block |
| ECU-IG No. 2 Fuse | Driver Side Junction Block |
| Engine Compartment Junction Block | Left Side Of Engine Compartment, In Front Of Shock Tower |
| Engine Control Module | Under Right Side Of Instrument Panel, Behind Kick Panel |
| Engine Coolant Temperature Sending Unit | On Top Of Engine Assembly |
| Fuel Sending Unit | Incorporated With Fuel Pump Assembly In Fuel Tank |
| Gauge No. 1 Fuse | Driver Side Junction Block |
| IG-2 Relay | Engine Compartment Junction Block |
| Light Control Rheostat | Incorporated Into Heating & Ventilation Register On Left Side Of Instrument Panel |
| Light Failure Sensor | Right Rear Corner Of Luggage Compartment |
| Low Oil Pressure Warning Switch | On Left Side Of Engine Assembly |
| Overdrive Switch | On Gearshift Lever |
| Panel Fuse | Driver Side Junction Block |
| Parking Brake Switch | Near Top Of Parking Brake Pedal |
| Park/Neutral Position Switch | On Left Side Of Transaxle |
| Radio Fuse | Driver Side Junction Block |
| Seat Belt Buckle Switch | In Buckle Of Each Front Seat Belt Assembly |
| Seat Belt Warning Occupant Detection Sensor | Under Passenger Seat |
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.