The Lexus RX is a leading luxury crossover in the United States. The third-generation model retains the defining characteristics of its predecessors—performance, power, and sportiness. The signature luxury inherent to the Lexus RX remains unchanged, perfectly complementing its premium positioning. The third-generation RX 350 features a five-seat interior with split-folding, fore-aft sliding, and reclining rear seats.
This article provides detailed fuse box diagrams for the third-generation Lexus RX 270 / RX 350 (AL10 chassis) covering model years 2008, 2009, 2010, 2011, 2012, 2013, 2014, and 2015. Below are the locations, diagrams, and photos of the power distribution blocks. The fuse for the “Cigarette Lighter” is highlighted in bold.
In the engine compartment
Component Locations. 1 — Brake pressure modulator / ABS ECU, 2 — Headlight washer control relay, 3 — Engine Control Module (ECM), 4 — Engine compartment fuse box, 5 — Transmission Control Module (TCM), 6 — Cooling fan ECU.
Accessing the fuse box.
| Engine Compartment Fuse Box Assignment (Block No. 4 in illustration) |
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|---|---|---|
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| No. | Circuit / Description | A |
| 1 | Radiator cooling fans (RDI FAN) | 80 |
| 2 | Rear window defogger (RR DEF) | 50 |
| 3 | Not used | 50 |
| 4 | Air conditioning system (HEATER) | 50 |
| 5 | Spare | 30 |
| 6 | 40 | |
| 7 | Vehicle Stability Control / ABS No. 2 (ABS #2) | 30 |
| 8 | Headlight washer (H-LP CLN) | 30 |
| 9 | Power tailgate (PBD) | 30 |
| 10 | Starter system (ST) | 30 |
| 11 | Fuses supplied: A/F, H-LP RH HI, H-LP LH LO, H-LP RH LO, H-LP LH HI, HORN, S-HORN | 50 |
| 12 | Vehicle Stability Control / ABS No. 1 (ABS #1) | 50 |
| 13 | Electric Power Steering (EPS) | 60 |
| 14 | Fuses supplied: IG1 MAIN, TOWING WATT, DEICER, TOWING, STOP, RDI FAN #1, FILTER, RR DEF, AIR SUS, HEATER, ABS #2, H-LP CLN, PBD, ECU-IG1 #1, ECU-IG1 #3, GAUGE #1, ECU-IG1 #2, EPS, FR WIP, RR WIP, FR WASH, RR WASH, RH S-HTR, LH S-HTR, TAIL, PANEL, D/L ALT B, FR FOG, FR DOOR, FL DOOR, RR DOOR, RL DOOR, PSB, P-SEAT LH, P-SEAT RH, TI&TE, AIR SUS, FUEL OPN, DR LOCK, OBD, RR FOG, S/ROOF, 4WD, INVERTER, ECU-ACC, P/POINT, CIG, RADIO No. 2 | 140 |
| 15 | Audio amplifier No. 1 (AMP1) | 30 |
| 16 | Engine & transmission control system, EFI main safety circuit (EFI MAIN), EFI #2, F/PMP | 30 |
| 17 | Audio amplifier No. 2 (AMP2) | 30 |
| 18 | Fuses supplied: IGN, GAUGE #2, ECU-IG2 | 30 |
| 19 | Power door locks (D/L) | 25 |
| 20 | Steering lock system (STR LOCK) | 20 |
| 21 | Combination meter, navigation system, audio system | 15 |
| 22 | Hazard lights / Security alarm (HAZ) | 15 |
| 23 | Engine control system (EFI #1) | 10 |
| 24 | Audio system, navigation system (RADIO #1) | 10 |
| 25 | Ignition / Starter system (AM2) | 7.5 |
| 26 | Air conditioning, SRS airbags & seat belt pretensioners, audio system, VSC system, power windows | 7.5 |
| 27 | Emergency call system (MAYDAY / TEL) | 7.5 |
| 28 | Engine immobilizer system (IMMOBI) | 7.5 |
| 29 | Charging system (ALT-S) | 7.5 |
| 30 | Daytime Running Lights (DRL) | 7.5 |
| 31 | Engine management system | 10 |
| 32 | Interior illumination (DOME) | 10 |
| 33 | Power tilt/telescopic column, multiplex communication system, combination meter, power seats, power tailgate, head-up display, smart key system, power mirrors, steering angle sensor, remote keyless entry | 10 |
| 34 | Engine Control Module (ECM) and Transmission Control Module (TCM) (ECU-B) | 10 |
| 35 | Cruise Control System (CCS) | 7.5 |
| 36 | Air conditioning system, rear window defogger, VSC system, electric cooling fans | 10 |
| 37 | Backup lights (BK/UP LP) | 7.5 |
| 38 | Air conditioning system | 15 |
| 39 | Headlight washer, cruise control system, VSC system, air conditioning system | 10 |
| 40 | Engine management system (EFI #2) | 10 |
| 41 | Fuel pump control system (F/PMP) | 15 |
| 42 | Windshield wiper de-icer (DEICER) | 25 |
| 43 | Vehicle Stability Control, dynamic radar cruise control, stop lights, engine & transmission control, shift lock system, starter system | 7.5 |
| 44 | Trailer auxiliary battery charging (TOWING BATT) | 20 |
| 45 | Trailer lighting system (TOWING) | 30 |
| 46 | FILTER (Not used) | 10 |
| 47 | Fuses supplied by IG1 MAIN: ECU-IG1 #6, BK/UP LP, ECU-IG1 #5, ECU-IG1 #4 | 30 |
| 48 | Right headlight high beam (H-LP RH HI) | 15 |
| 49 | Left headlight high beam (H-LP LH HI) | 15 |
| 50 | Not used | 10 |
| 51 | Right headlight low beam (H-LP RH LO) | 15 |
| 52 | Left headlight low beam (H-LP LH LO) | 15 |
| 53 | Horn (HORN) | 10 |
| 54 | Air/Fuel ratio sensor (A/F) | 20 |
| 55 | Security horn (S-HORN) | 7.5 |
| Relays | ||
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In the passenger compartment
Component Locations (Instrument Panel) . 1 — Under-dash fuse box , 2 — Multiplex Network Body ECU, 3 — Power source control ECU, 4 — Radar cruise control ECU, 5 — Adaptive Front-lighting System (AFS) ECU, 6 — Stop light relay, 7 — Electric Power Steering (EPS) ECU, 8 — Under-dash relay box, 9 — Tilt and telescopic steering ECU, 10 — Turn signal flasher relay, 11 — CAN junction connectors, 12 — Double lock door control relay, 13 — Electronically modulated air suspension ECU, 14 — All-Wheel Drive (AWD) ECU, 15 — Pre-Collision System (PCS) ECU, 16 — Parking assist camera controller, 17 — Intuitive parking assist ECU, 18 — Air conditioning ECU, 19 — Immobilizer ECU, 20 — Smart Access with Push-Button Start ECU, 21 — Airbag sensor assembly (SRS ECU), 22 — Telematics / G-BOOK transceiver, 23 — Auxiliary audio input converter, 24 — Gateway / Junction block ECU.
Fuse box location.
| Passenger Compartment Fuse Box Assignment (Block No. 1 in illustration) |
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|---|---|---|
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| No. | Circuit / Description | A |
| 1 | Auxiliary power outlets (P/POINT) | 15 |
| 2 | Navigation system, air conditioning system, audio system, multiplex system, multi-information display, head-up display (ECU-ACC) | 10 |
| 3 |
|
15 |
| 4 | Audio system, navigation system (RADIO No. 2) | 7.5 |
| 5 | Hazard lights, navigation system, head-up display, air conditioning system, charging system (ECU-IG1 #1) | 10 |
| 6 | Power mirrors, windshield wipers and washers, starter system, auxiliary power outlet, power moonroof, air conditioning system (ECU-IG1 #2) | 10 |
| 7 | Multiplex system, steering angle sensor, shift lock control, power tilt/telescopic column, transmission control module, power tailgate, Pre-Collision System, VSC, TPMS (ECU-IG1 #3) | 10 |
| 8 | Power moonroof (S/ROOF) | 30 |
| 9 | Fuel filler door opener (FUEL OPN) | 7.5 |
| 10 | Pre-crash seat belts (PSB) | 30 |
| 11 | Power tilt and telescopic column (TI&TE) | 30 |
| 12 | Power door locks (DR LOCK) | 10 |
| 13 | Front fog lights (FR FOG) | 15 |
| 14 | Driver / Left power seat (P-SEAT LH) | 30 |
| 15 | All-Wheel Drive system (4WD) | 7.5 |
| 16 | AC inverter (INVERTER) | 20 |
| 17 | Rear fog lights (RR FOG) | 7.5 |
| 18 | Multiplex system, power door locks, power tailgate (D/L ALT B) | 25 |
| 19 | Electric Power Steering (EPS) | 10 |
| 20 | Intuitive parking assist, AWD system, seat belt pretensioners (ECU-IG1 #4) | 10 |
| 21 | Instrument panel illumination, navigation system, transmission control module, audio system, multi-information display, air conditioning system, multiplex system (PANEL) | 10 |
| 22 | Tail lights, parking lights, license plate lights, side marker lights (TAIL) | 10 |
| 23 | Electronically Modulated Air Suspension (AIR SUS) | 20 |
| 24 | Passenger / Right power seat (P-SEAT RH) | 30 |
| 25 | On-Board Diagnostics system (OBD) | 7.5 |
| 26 | Front passenger / Right power window, right power mirror (FR DOOR) | 25 |
| 27 | Rear right power window (RR DOOR) | 25 |
| 28 | Driver / Left power window, left power mirror (FL DOOR) | 25 |
| 29 | Rear left power window (RL DOOR) | 25 |
| 30 | Windshield washer (FR WASH) | 25 |
| 31 | Rear window wiper (RR WIP) | 15 |
| 32 | Rear window washer (RR WASH) | 20 |
| 33 | Windshield wiper (FR WIP) | 30 |
| 34 | Engine management system, SRS airbag system, brake lights, transmission control module, steering lock system (ECU-IG1 #5) | 10 |
| 35 | Combination meter (GAUGE #1) | 7.5 |
| 36 | Front passenger / Right seat heater (RH S-HTR) | 15 |
| 37 | Driver / Left seat heater (LH S-HTR) | 15 |
| Relay Box (Block No. 8 in illustration) |
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|---|---|
|
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| No. | Protected Circuit / Relay Function |
| 1 | Fuel filler door opener relay |
| 2 | Rear fog light relay |
| 3 | IG1 relay (Instrument panel / Ignition) |