The 4th generation Toyota Sienna (index LH40) was produced from 2020 to 2026 and has received several updates during this period. This material contains a detailed description of the fuses and relays of the Toyota Sienna 4, including block diagrams and their location. Information is also provided about the fuse responsible for the operation of the cigarette lighter.
In the passenger compartment of the Toyota Sienna, the fuse box is located on the left side under the instrument panel. To access the elements, you need to remove the protective cover.
The fuse block itself will look something like this.
| Marking | Decoding |
|---|---|
| FOG RR | Rear fog lights |
| ECU-B NO.2 | Key detection alarm, tire pressure sensor |
| OBD | Diagnostic connector |
| ECU-B NO.1 | Keyless Entry System, Body ECU, VSC, Smart Entry & Start System, Clock |
| DOME | Interior lighting, trunk release system, smart access and start, immobilizer, start system, steering lock, wireless control system |
| D/L | Central lock |
| TRUNK OPN | Trunk lock |
| STOP | Stop signs |
| AM2 | Trunk opening system, smart access and start, immobilizer, starting system, steering lock, wireless control system |
| ECU-DCC NO.2 | ABS, air conditioning, audio system, automatic lighting system, trunk opening system, monitor, instrument panel, cruise control, central locking, double locking, dynamic cruise control radar, engine control unit, intelligent access and start system, EPS, front fog lamp, fuel filler flap, active flap, headlights, headlight range adjustment, hybrid system, backlight, immobilizer, intelligent parking system, interior lighting, lane keeping system, automatic turn signal off, lighting buzzer, navigation, power windows, collision avoidance system, rear fog lamps, electric mirrors |
| HAZ | Alarm system (acoustics) |
| ECU-DCC NO.1 | ABS, TRC, VSC |
| PANEL | VSC OFF switch, instrument panel, BSM switch, 4WD switch, brush heating, multi-point injection control system, parking systems, seat heating control, sockets, trunk button, air conditioning, rear window heating, audio system, steering wheel buttons, cup holder lighting |
| RADIO | Audio system |
| TAIL | Side lights, license plate lights, fog lights |
| DOOR R/R | Rear doors, power windows |
| DOOR F/L | Front left door window regulators |
| S-HORN | Alarms |
| DOOR F/R | Front right door window regulators |
| CTRL LOCK | Steering wheel lock |
| P/OUTLET NO/1 | Electrical outlet, cigarette lighter |
| DCM | Telematics system |
| SFT LOCK-ACC | Gear selector lock |
| ECU-ACC | Accessories |
| 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 access and start system, EPS, front fog lights, fuel filler flap, active flap, headlights, headlight range adjustment, hybrid system |
| A/BAG-IG2 | Airbags, seat belt indicator |
| BKUP LP | Reversing lights |
The fuse marked P / OUTLET is responsible for the operation of the cigarette lighter.
The upper part of the unit contains fuses that ensure the operation of the power windows and electric seat adjustment.
On the side of the main unit, there are places for installing additional 30 A fuses – they can be used to power the power seats, power windows and other powerful consumers.
In addition, an additional unit is installed in the luggage compartment of the car, which contains separate fuses and relays for auxiliary systems.
Under the hood in the engine compartment on the left side is a fuse and relay block, also covered by a protective cover.
Marking
| Marking | Decoding |
|---|---|
| A/F HTR | CVT and gear shift indicator, engine control |
| ABS NO.1 | ABS, brake hold system, electric parking brake, hill start assist, TRC, VSC |
| ABS NO.2 | ABS, brake hold system, electric parking brake, hill start assist, TRC, VSC |
| BATT-S NO.1 | Charging, start-stop system |
| BBC NO.1 | Start-stop system |
| BBC NO.2 | Start-stop system |
| D INJ | CVT and gear shift indicator, engine control |
| D/C CUT | Feeding |
| D/C CUT | Feeding |
| ECU-IGP NO.1 | CVT and gear shift indicator, engine control |
| ECU-IGP NO.2 | Gear shift lock |
| ECU-IGP NO.3 | ABS, air conditioning, CVT and gear shift indicator, adaptive cruise control with radar, engine management, heated steering wheel, hill start assist, immobilizer, heated mirrors, multi-element communication system (CAN), heated rear window, heated seats, start-stop system, brake light, TRC, VSC |
| EFI No.1 | CVT and gear shift indicator, engine control |
| EFI No.2 | Cooling fan, CVT and gear shift indicator, engine management |
| EFI No.3 | CVT and gear shift indicator, engine management, start-stop system |
| EFI No.4 | CVT and gear shift indicator, engine management |
| EFI No.5 | CVT and gear shift indicator, engine control |
| EFI-MAIN NO.1 | Cooling fan, CVT and gear shift indicator, engine management |
| EFI-MAIN NO.2 | CVT and gear shift indicator, engine control |
| EFI-MAIN NO.3 | CVT and gear shift indicator, engine control |
| EPS | Electric power steering (EPS) |
| FAN NO.1 | Cooling fan |
| HORN | Alarm, anti-theft system |
| IGP-MAIN | Feeding |
| IGP-MAIN | Feeding |
| INJ | CVT and gear shift indicator, engine control, ignition |
| INP STD NO.1-1 | Air conditioning, CVT and gear shift indicator, engine management, lighting, heated mirrors, rear fog light, heated rear window, remote mirror control, heated seats, tail light |
| PTC HTR | Air conditioning |
| R/B ALL | Feeding |
| ST NO.1 | Access and start system, immobilizer, start, steering lock, start-stop system, wireless door lock |
| STD P/I NO.1 | Automatic high beam system, automatic light control, front fog lights, main headlights, automatic headlight range adjustment, automatic light switch-off system, light reminder, auxiliary socket (front fog lights), tail lights |
| SUB R/B ALT | Feeding |
| PSD | Sliding doors |
| TOWING-B | Additional connector (Trailer connection) |
| WASHER | Front wiper and windshield washer, rear wiper and windshield washer |
| WIPER | Front wiper and windshield washer, rear wiper and windshield washer |
| H-LP RH | Right headlight. Right headlight washer. |
| H-LP LH | Left headlight. Left headlight washer. |
| VVT | Valve timing and valve lift control system. |
| IG2 No. 1 | Distributed/sequential fuel injection |
| ST № 1 | Starter. Starting system. |
| FOG FR | Front fog lights. |
| DEF | Heated rear window and mirrors. |