The second-generation Lexus RX, introduced in 2003, features a redesigned body with coupe-like styling cues that emphasize its sporty profile while achieving an excellent drag coefficient (0.32). The chassis and engine mounts were re-engineered to minimize noise, vibration, and harshness (NVH) to segment-leading levels. Key lighting upgrades include adaptive HID/xenon headlights and rear LED combination lamps.
This article provides detailed fuse box diagrams and location guides for the Lexus RX300 / RX330 (XU30 chassis) second generation (2003, 2004, 2005, and 2006 model years). Below, you will find component locations, photographs of the power distribution centers, and circuit ratings. The fuse for the “Cigarette lighter” circuit is highlighted in bold.
Engine Compartment
Component Locations: #1 – Relay Box, #2 – Fuse Box, #3 – Engine Compartment Relay Box No. 2.
Fuse box location.
Engine compartment fuse box layout.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Designation | Rating (A) |
| 1 | Low-beam headlight (right) | 15 |
| 2 | Unused | - |
| 3 | EFI No. 2: Electronic Fuel Injection system | 10 |
| 4 | RAD No. 1: Radiator cooling fan | 15 |
| 5 | Anti-theft system, air conditioning, instrument cluster, moonroof, multiplex communication system | 7.5 |
| 6 | Personal lights, interior dome lamp, ignition key cylinder light, instrument cluster, navigation system | 7.5 |
| 7 | Unused | - |
| 8 | Unused | - |
| 9 | Audio system / Radio and cassette player | 30 |
| 10 | Power door locks / Central locking system | 25 |
| 11 | Fuel system | 25 |
| 12 | EFI No. 1: Electronic Fuel Injection system | 25 |
| 13 | Hazard warning lights and turn signals | 15 |
| 14 | Navigation system | 7.5 |
| 15 | ALT-S: Alternator voltage sensing circuit | 7.5 |
| 16 | ETCS: Electronic Throttle Control System | 10 |
| 17 | Horn | 10 |
| 18 | MAIN: Main power distribution fuse | 40 |
| 19 | AM2: Ignition switch circuit (“GAUGE No. 2”, “IGN”, “INJ”, and “ST”) | 30 |
| 20 | Unused | - |
| 21 | Low-beam headlight (left) | 15 |
| 22 | High-beam headlight (left) | 15 |
| 23 | High-beam headlight (right) | 15 |
| 24 | Unused | - |
| 25 | Unused | - |
| 26 | ABS No. 2: Anti-lock Braking System (ABS), Vehicle Stability Control (VSC) | 50 |
| 27 | A/C condenser and radiator cooling fan motors | 50 |
| 28 | ALT: Main alternator fuse | 140 |
| 29 |
|
60 100 |
| 30 | Power liftgate / Power rear door actuator | 30 |
| 31 | Headlight washers | 30 |
| 32 | ABS No. 1: Anti-lock Braking System (ABS), Vehicle Stability Control (VSC) | 30 |
| 33 | Rear window defogger | 40 |
| 34 | HVAC blower motor / Climate control system | 50 |
| A | STARTER (Starter relay) | |
| B | HORN (Horn relay) | |
| C | EFI MAIN (Electronic Fuel Injection main / fuel pump relay) | |
| D | AIR SUS (Air suspension system relay) | |
| E | Unused | |
| F | Unused | |
| G | A/F (Air-Fuel Ratio sensor / ECM relay) | |
Passenger Compartment
Passenger compartment fuse panel located under the dashboard.
General view of fuse panel.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Rating (A) |
| 1 | Power seats | 30 |
| 2 | Power windows, multiplex communication system, power exterior mirrors | 30 |
| 3 | Right rear power window motor | 20 |
| 4 | Left rear power window motor | 20 |
| 5 | Fuel filler door release actuator | 7.5 |
| 6 | FOG: Front fog lamps | 15 |
| 7 | OBD II On-Board Diagnostics system | 7.5 |
| 8 | Heated exterior mirrors and windshield wiper de-icer | 20 |
| 9 | Stop lamps, high-mounted stop lamp, VSC, rear height control system, fuel injection system | 10 |
| 10 | Power tilt and telescopic steering column | 30 |
| 11 | Engine immobilizer system | 7.5 |
| 12 | Starting system / Ignition circuit | 7.5 |
| 13 | RR FOG: Rear fog lamps | 7.5 |
| 14 | AIRSUS: Air suspension system | 7.5 |
| 15 | Multiplex communication system (CAN network) | 25 |
| 16 | Power moonroof / sunroof | 30 |
| 17 | Parking lamps, front fog lamps, license plate lights, tail lamps, front turn signals | 10 |
| 18 | Glove box lamp, instrument cluster, center console illumination, audio system, auxiliary power outlets, headlight washers, seat heaters, power liftgate | 7.5 |
| 19 | Engine immobilizer, power windows, heated exterior mirrors, ABS, TRAC, VSC, HVAC climate control, moonroof, Lexus Link system, power steering column, multi-information display, driving position memory system | 7.5 |
| 20 | Adaptive Front-lighting System (AFS), cruise control, VSC | 10 |
| 21 | Condenser cooling fan motor, air conditioning, rear window defogger, ignition switch, windshield wiper de-icer | 7.5 |
| 22 | Windshield washer pump and wiper motor | 20 |
| 23 | SEAT HTR: Heated front seats | 20 |
| 24 | GAUGE No. 1: Instrument cluster gauges, dashboard lights, hazard warning lights, seat belt warning system, auxiliary power outlets, backup/reverse lamps | 7.5 |
| 25 | Windshield wipers | 30 |
| 26 | Rear window wiper and washer system | 15 |
| 27 | EFI: Electronic Fuel Injection system | 20 |
| 28 | SRS airbags, stop lamps, engine immobilizer | 10 |
| 29 | GAUGE No. 2: Instrument cluster / gauges | 7.5 |
| 30 | Multi-information display, power exterior mirrors, multiplex communication system | 7.5 |
| 31 | Cigarette lighter (Lexus RX300 / RX330) | 15 |
| 32 | Auxiliary 12V power outlets | 15 |
| 33 | Instrument cluster, navigation system, audio system | 7.5 |
| 34 | Heated exterior mirrors | 10 |
| A | Front Fog Lamp Relay | |
| B | Parking / Tail Lamp Relay | |
| C | Main Power System Relay | |
| D | Ignition Switch Circuit Relay | |
| Passenger Compartment Relay Box | |
|---|---|
|
|
| A | Power Door Lock Relay |
| B | Heater / Blower Fan Relay |