Toyota Highlander 4 generation was produced in 2020, 2021, 2022, 2023, 2024, 2025, 2026 with designation U70. In our material you can find a description of fuses and relays Toyota Highlander 4 with block diagrams, their locations and photo examples of performance. Let’s highlight the cigarette lighter fuse.
Designation of fuses and relays, as well as their location in the blocks may differ from the presented and depends on the year of manufacture, region of delivery and the level of electrical equipment of your vehicle.
Passenger compartment
In the vehicle interior, the fuse box is located on the left side under the instrument panel. The protective cover must be removed for access.
RHD
Photo for example.
Check the element assignments against your schematics from the block cover.
Diagram
Assignment
| FOG RR | Rear fog lamps |
| ECU-B NO.2 | Key detection indication, tire pressure sensor |
| OBD | Diagnostic connector |
| ECU-B NO.1 | Wireless Control System, Body ECU, VSC, Intelligent Entry & Start System, Clock |
| DOME | Interior lighting, tailgate opening system, smart entry and start system, immobilizer, start system, steering lock, wireless control system |
| D/L | central locking |
| TRUNK OPN | Trunk lock |
| STOP | Brake light |
| AM2 | Tailgate opening system, smart entry and start system, immobilizer, start system, steering wheel lock, wireless control system |
| ECU-DCC NO.2 | ABS, air conditioning, audio system, automatic lighting system, tailgate opening system, monitor, instrument cluster, cruise control, central locking, double locking, dynamic cruise control radar, engine control unit, intelligent entry and start system, EPS, front fog light, fuel filler flap, active air flap control system, headlights, headlight range control, hybrid system, illumination, immobilizer, intelligent parking system, interior lighting, lane control system, automatic turn-off system for turn signals, light buzzer, navigation, power windows, anti-collision system, rear fog light, power mirrors |
| HAZ | Alarm, Hazard |
| ECU-DCC NO.1 | ABS, TRC, VSC |
| PANEL | VSC OFF switch, instrument cluster, BSM switch, 4WD switch, brush rest heating switch, multiport fuel injection system / sequential multiport fuel injection system, park assist systems, heated seat switches, sockets, tailgate switch, air conditioning control unit , rear window heating switch, audio system, steering wheel buttons, cup holder lights |
| RADIO | Audio system |
| TAIL | Side light, license plate light, fog light |
| DOOR R/R | Rear door windows |
| DOOR F/L | Power windows front left door |
| S-HORN | Anti-theft system |
| DOOR F/R | Power windows front right door |
| STRG LOCK | Steering lock |
| P/OUTLET NO/1 | Power socket, cigarette lighter |
| DCM | Telematics system |
| SFT LOCK-ACC | Gear selector lock |
| ECU-ACC | Accessories. Check |
| WASHER | Glass washer |
| ECU-IG1 NO.3 | Blind spot monitoring |
| EPS-IG1 | Electric steering |
| ECU-IG1 NO.4 | Dynamic cruise control radar, engine control unit, intelligent entry and start system, EPS, front fog light, fuel flap, active air flap control system, headlights, headlight range control, hybrid system, lighting, immobilizer, intelligent parking system, interior lighting , lane control system, automatic turn-off system for turn signals, buzzer light, navigation, power windows, anti-collision system, rear fog light, power mirrors, seat belt indicator, gear selector lock, sunroof, SRS, starting system, steering lock, side light, telematics system, anti-theft system, tire pressure monitoring system, TRC, direction indicators (alarm), pedestrian warning system (noise generator), VSC, wireless charging system, wireless control system |
| A/BAG-IG2 | SRS, seat belt indicator |
| BKUP LP | Reversing lamps, audio system, monitor, navigation |
| METER-IG2 | Measuring instruments |
| ECU-IG1 NO.2 | ABS, TRC, VSC |
| ECU-IG2 NO.3 | ABS, cruise control, dynamic cruise control radar, hybrid system, body electronics control unit (CAN), gear selector lock, telematics system, TRC, pedestrian warning system (noise generator), VSC |
| ECU-IG1 NO.1 | Vehicle Stability System, Electric Cooling Fans, Anti Mist for Rear Window, Anti Mist for Outside Mirrors, Steering Wheel Sensor, Multiport Fuel Injection System / Sequential Multiport Fuel Injection System, Headlights (Low Beam), Battery Charging System, Blind Spot Monitor |
The fuse designated as P / OUTLET is responsible for the operation of the cigarette lighter.
In the upper part of the box, there are fuses responsible for the electric glass lifters and the electric drive of the seats.
Another fuse box can be installed next to the battery.
Schematic with labelling
Allocation
| BATT FAN NO.1 | 15A Cruise Control, Hybrid System, Shift Control System |
| BATT FAN NO.2 | 15A Cruise Control, Hybrid System, Shift Control System |
| BATT-S | 7,5A Air Conditioner, Cruise Control, Hybrid System, Shift Control System |
| D/L NO.2 | 15A Door Lock Control |
| ECU-B NO.3 | 7,5A Air Conditioner, Automatic Light Control, Back Door Opener, Combination Meter, Door Lock Control, Front Fog Light, Front Wiper and Washer, Headlight, Headlight Cleaner, Illumination, Immobiliser System, Interior Light, Light Auto Turn Off System, Panoramic Moon Roof System, Panoramic View Monitor System, Power Back Door, Power Seat, Power Window, Rear Fog Light, Rear Wiper and Washer, Remote Control Mirror, Seat Belt Warning, Sliding Roof, Smart Entry & Start System, Starting, Steering Lock, Taillight, Theft Deterrent, Tire Pressure Warning System, Wireless Door Lock Control |
| IGCT NO.1 | 10A Cruise Control, Dynamic Radar Cruise Control, Hybrid System, Shift Control System |
| IGCT NO.2 | 10A Air Conditioner, Cruise Control, Hybrid System, Shift Control System |
| IGCT NO.3 | 10A Cruise Control, Dynamic Radar Cruise Control, Hybrid System, Shift Control System |
| IGCT-IG | 30A Air Conditioner, Cruise Control, Hybrid System, Shift Control System |
| MAIN | 180A Power Source |
| MG | 7,5A Cruise Control, Hybrid System, Shift Control System |
| PCU | 10A Cruise Control, Dynamic Radar Cruise Control, Hybrid System, Shift Control System |
Engine compartment
There are 2 blocks with fuses and relays under the hood.
Main fuse box
The main box with fuses and relays is located on the left side, next to the battery and is covered by a protective cover.
Diagram
Designation
| USB2 | Charging connectors |
| DEF | Rear window and mirror heater |
| PBD | Electric trunk door actuator |
| NOISE FILTER | Interference suppression filter |
| D-DBL LCK | Double lock |
| S/HTR MAIN | Heated seats |
| 4WD | Four-wheel drive |
| FOG FR | Front fog lights |
| P/OUTLET N0.2 | Electrical outlet No. 2 |
| TOWING | Trailer socket |
| H-LP-C’LN | Headlight washer pump electric motor |
| HTR | Air conditioning system |
| H LP RH | Head lighting. Right headlight. Right headlight washer. |
| EFI MAIN N0.4 | Distributed fuel injection system/ sequential distributed fuel injection system |
| H LP LH | Head lighting. Left headlamp. Left headlamp washer. |
| VVT | Variable Valve Timing with intelligence: control system for timing and valve lift. |
| EFI MAIN N0.2 | Distributed Fuel Injection System/ Sequential Distributed Fuel Injection System |
| HORN | Horn |
| EFI MAIN N0.1 | Distributed fuel injection system/ sequential distributed fuel injection system |
| IG2 MAIN | Distributed fuel injection system/ sequential distributed fuel injection system. Measuring instruments, ECU start-stone. |
| TOWING-B | Trailer connector |
| EFI MAIN N0.3 | Distributed fuel injection system/ sequential distributed fuel injection system |
| ST N0.1 | Starter. Starting system relay |
| MIR HTR | Mirror heater, fuel injection system/ sequential fuel injection system |
| ВВС NO.1 | Start-stop system |
| WIPER | Wiper and washer of windshield and tailgate window |
| door | |
| ABS NO. 1 | ABS Skid control system ECU, brake system actuator. Left. |
| ABS NO. 2 | ABS. Right. |
| EPS | Electric power steering. |
| ALT | Generator assembly |
| FAN N0.1 | Fan No. 1 |
| INJ | Ignition coils #1, 2, 3 |
| EFI N0.1 | Distributed fuel injection system/ sequential distributed fuel injection system |
| EFI N0.2 | Distributed fuel injection system/ sequential distributed fuel injection system |
| Realy | |
| EFI MAIN N0.2 | Distributed fuel injection system/ sequential distributed fuel injection system |
| WIPER | Windshield wiper, windshield washer and tailgate washer |
| EFI MAIN № 1 | Distributed fuel injection system/ sequential distributed fuel injection system |
| HORN | Buzzer |
| H-LP RH | Right headlamp. Right headlamp washer. |
| H-LP LH | Left headlamp. Left headlamp washer. |
| VVT | Timing and valve lift control system. |
| IG2 № 1 | Distributed/ sequential fuel injection system |
| ST № 1 | Starter. Starting system. |
| FOG FR | Front fog lamps. |
| DEF | Rear window and mirror heater. |
Additional fuse box
Diagram
Appointment
| H-LP CLN | 30A Automatic Light Control, Headlight, Headlight Cleaner, Light Auto Turn Off System |
| HWD NO.1 | 50A Front Window Deicer, Heated Windshield Defroster |
| HWD NO.2 | 50A Front Window Deicer, Heated Windshield Defroster |
| MIR MTR | 7,5A Remote Control Mirror |
| PTC HTR NO.1 | 50A Air Conditioner |
| PTC HTR NO.2 | 50A Air Conditioner |
| S/HTR R/L | 15A Seat Heater (Rear No. 1 Seat) |
| S/HTR R/R | 15A Seat Heater (Rear No. 1 Seat) |
| SHADE | 20A Panoramic Moon Roof System |
| STRG HTR | 10A Heated Steering Wheel System |
| TOWING-ALT | 30A Option Connector (Trailer Towing) |
| WSH NZL HTR | 10A Front Wiper and Washer |
Any questions left or have anything to add, write in the comments.