The first-generation Lexus GX (J120) is based on the third-generation Toyota Land Cruiser Prado (120 series), featuring premium interior trim, a 4.7-liter V8 engine, and a 5-speed automatic transmission. Manufactured at Toyota's Tahara plant in Japan, the vehicle was produced primarily for the North American market. In the Lexus model lineup, this mid-size luxury SUV—offering seating for up to eight passengers—slotted between the full-size LX 470 and the crossover RX 350. Equipped with a full-time four-wheel-drive system featuring a Torsen center differential, the Lexus GX 470 is capable off-road, while its chassis tuning ensures a refined, comfortable ride for daily driving.
The electrical power supply circuits of the vehicle are protected by relays and fuses. Fuses and relays are housed in distribution blocks located in the engine compartment and passenger cabin. This guide provides comprehensive fuse block diagrams and circuit assignments for the first-generation Lexus GX 470 (J120 series) across model years 2002, 2003, 2004, 2005, 2006, 2007, 2008, and 2009.
Passenger Compartment
Located on the driver’s side, under the lower left section of the instrument panel.
Passenger compartment fuse box location.
| Passenger Compartment Fuse Block Diagram | ||
|---|---|---|
|
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| No. | Circuit Protected | Rating (A) |
| 44 | EFI system, VSC | 10 |
| 45 | SRS airbag system | 10 |
| 46 | Instrument cluster | 7.5 |
| 47 | EFI system | 7.5 |
| 48 | Windshield wiper and washer | 30 |
| 49 | TEMS adaptive suspension | 20 |
| 50 | Center differential lock | 20 |
| 51 | Rear window wiper | 15 |
| 52 | Power driver seat | 30 |
| 53 | Power passenger seat | 30 |
| 54 | Auxiliary 12 V DC power socket | 15 |
| 55 | Rear air conditioning, auto-dimming rearview mirror | 10 |
| 56 | Rear window washer | 15 |
| 57 | Engine immobilizer, power windows, power heated mirrors, ABS, TRAC, VSC, HVAC system, moonroof, Lexus Link, power tilt/telescoping steering column, multi-information display, seat memory system | 10 |
| 58 | HVAC system, backup lamps, rear window defogger, seat heaters, VSC | 10 |
| 59 | EFI system | 7.5 |
| 60 | Front passenger power window | 20 |
| 61 | Rear right power window | 20 |
| 62 | Rear left power window | 20 |
| 63 | Instrument cluster | 10 |
| 64 | Parking lamps, front fog lamps, license plate lamps, tail lamps | 10 |
| 65 | Engine immobilizer, auxiliary power outlets, power mirrors, audio system, multi-information display | 7.5 |
| 66 | Cigarette lighter (Lexus GX 470) | 10 |
| 67 | Power windows, moonroof, power steering column | 30 |
| Relays (Rear side of fuse block) | ||
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| A | Horn relay | |
| B | Turn signal flasher relay | |
| C | Main power relay | |
| D | Auxiliary power relay | |
Engine Compartment
Located on the right (passenger) side of the engine compartment.
Fuse box location overview.
| Engine Compartment Fuse Block Diagram (Lexus GX 470) | ||
|---|---|---|
|
||
| No. | Circuit Protected | Rating (A) |
| 1 | Multi-circuit protection fuse | 10 |
| 2 | Charging system and circuit protection: "ALT", "HEATER", "CDS FAN", "FR FOG", "DEFOG", "AIR SUS", "AC115V INV", "SEAT HEATER", "TOWING BRK", "TOWING" | 140 |
| 3 | Auxiliary / spare circuits | 15 |
| 4 | Blower motor (HVAC system) | 50 |
| 5 | Rear air suspension height control | 50 |
| 6 | Ignition switch circuits: "ACC", "CIG", "IG1", "FR WIP-WSH", "RR WIP", "RR WSH", "DIFF", "TEMS", "STA" | 50 |
| 7 | Trailer brake controller | 30 |
| 8 | Body control circuits: "P FR P/W", "P RR P/W", "D RR P/W", "D P/SEAT", "P P/SEAT", "TAIL", "PANEL", "TI&TE" | 50 |
| 9 | Trailer battery charge (TOWING BATT) | 30 |
| 10 | Trailer tail/towing lights | 40 |
| 11 | Radiator / condenser fan motor | 20 |
| 12 | Rear A/C blower motor | 30 |
| 13 | Heated exterior mirrors (MIR HTR) | 10 |
| 14 | Stop lamps, high-mount stop lamp, VSC, rear air suspension height control, EFI system | 10 |
| 15 | 115 V AC power outlet | 15 |
| 16 | Front fog lamps | 15 |
| 17 | OBD-II diagnostic system | 7.5 |
| 18 | Right headlight (low beam) | 10 |
| 19 | Left headlight (low beam) | 10 |
| 20 | Right headlight (high beam) | 10 |
| 21 | Left headlight (high beam) | 10 |
| 22 | EFI system | 10 |
| 23 | A/C climate control system | 7.5 |
| 24 * | Heated rear window (DEFOG) | 30 |
| 25 | Rear height control air suspension | 10 |
| 26 | Seat heaters | 20 |
| 27 | Ignition key cylinder lamp, dome lights, map lights, running board lamps, door courtesy lamps, interior handle illumination, multi-information display | 10 |
| 28 | Audio system / radio | 20 |
| 29 | Multiplex communication system (CAN/BEAN), VSC, auto-dimming rear view mirror, HVAC system, seat memory system, power windows, moonroof | 10 |
| 30 | Engine immobilizer system | 10 |
| 31 | ABS, VSC, TRAC, Brake Assist (ABS MTR) | 40 |
| 32 | Starting system, ignition circuits ("IGN", "SRS", "GAUGE", "ST2") | 30 |
| 33 | ABS, VSC, Brake Assist, TRAC (ABS PUMP) | 50 |
| 34 | Charging system (ALT-S) | 7.5 |
| 35 | Lexus Link telematics system | 7.5 |
| 36 | Horn | 10 |
| 37 | Hazard / turn signal lamps | 15 |
| 38 | Electronic Throttle Control System (ETCS) | 10 |
| 39 | EFI main circuit | 20 |
| 40 | Power driver window | 20 |
| 41 | Central power door locks | 25 |
| 42 | Towing converter | 30 |
| 43 | Audio power amplifier / head unit | 30 |
| Relays | ||
|
||
| 1 | Main power disconnect relay | |
| 2 | Front fog lamp relay | |
| 3 | Starter relay (STARTER) | |
| 4 | Ignition switch circuit relay (IG1) | |
| 5 | Heater / blower motor relay (HEATER) | |
| 6 | A/C magnetic clutch relay (MG CLT) | |
| 7 | 115 V AC inverter relay (AC115V INV) | |
| 8 | Rear window defogger relay (DEFOG) | |
| 9 | A/C condenser fan relay (CDS FAN) | |
| 10 | ABS pump motor relay (ABS MTR) | |
| 11 | Traction control pump relay (TRC MTR) | |
| 12 | ABS solenoid valve relay (ABS SOL) | |
| 13 | Headlamp relay (HEAD) | |
| 14 | Downhill Assist Control relay (DAC) | |
| 15 | Circuit open / fuel pump relay (C/OPN) | |
| 16 | Interior dome lighting relay (DOME) | |
| 17 | Electronic fuel injection relay (EFI) | |
| 18 | - | |
| 19 | Fuel pump control relay (FUEL PUMP) | |