Toyota Prius fuse box diagrams: complete guide by generation

BySerge Barrett

Understanding the fuse box layout in your Toyota Prius is essential for troubleshooting electrical issues, from minor glitches like non-working lights or power outlets to more complex hybrid system problems. The Prius, as a pioneer in hybrid technology, has evolved significantly across five generations, with fuse configurations adapting to new electronics, improved battery systems, advanced driver-assistance features, and higher-voltage components. Each generation features distinct fuse box locations and assignments due to changes in power management, inverter technology, and vehicle electronics.

Always work with the ignition off and the 12V battery disconnected when inspecting fuses. Use the correct amperage replacement to avoid fire hazards or damage to sensitive hybrid components. The diagrams below provide exhaustive assignments compiled from factory specifications for maximum accuracy.

First Generation Prius (1997–2003, NHW11 / XW11)

This generation introduced hybrid technology to the mass market. Fuse boxes are located in the engine compartment (main and additional blocks) and the passenger compartment (left side of the instrument panel, behind the cover).

Passenger Compartment Fuse Box Assignments:

  • PANEL: 5A – Audio system, ashtray light, headlight beam level control system, emergency flasher
  • GAUGE: 10A – Gauge and meter, emergency flasher, rear window defogger, service reminder indicator and warning buzzers, back-up light, power window system, air conditioning system
  • HTR: 10A – Air conditioning system
  • TAIL: 7.5A – Parking lights, tail lights, license plate lights, side marker lights
  • ECU-IG: 5A – Air conditioning system, anti-lock brake system, electric power steering, daytime running light system
  • STOP: 15A – Stop lights, high mounted stoplights, anti-lock brake system
  • ACC: 10A – Anti-lock brake system warning light, clock, audio system, multi-information display, shift lock system
  • WIPER: 30A – Windshield wiper
  • ECU-B: 7.5A – Air conditioning system, daytime running light system, electric power steering system, hybrid vehicle immobiliser system
  • CIG: 15A – Power outlet
  • WASHER: 15A – Washer
  • DOOR: 30A – Power door lock system
  • SRS ACC: 10A – SRS airbags, seat belt pretensioners
  • OBD II: 7.5A – On-board diagnosis system
  • PWR1: 20A – Power window system
  • AM1: 5A – ACC, CIG, SRS ACC, WASHER, HTR, WIPER, ECU-IG and GAUGE fuses
  • DEF: 40A – Rear window defogger
  • POWER: 30A – Power windows

Relays in Passenger Compartment: Ignition (IG1), Tail lights (TAIL), Accessory (ACC), Power windows, Rear window defogger (DEF).

Engine Compartment Fuse Box Assignments (Main):

  • CDS FAN: 30A – Air conditioning system
  • HORN: 10A – Horn
  • HEAD HI (RH): 10A – Right-hand headlight (high beam, with daytime running lights)
  • AM2: 15A – Starting system, multiport fuel injection system/sequential multiport fuel injection system, hybrid vehicle immobiliser system
  • THRO: 15A – Electronic throttle control system
  • HEAD (RH) / HEAD LO (RH): 10A – Right-hand headlight (low beam with daytime running lights)
  • HEAD HI (LH): 10A – Left-hand headlight (high beam with daytime running lights)
  • BATT FAN: 10A – Battery cooling fan
  • ABS NO.3: 20A – Hydraulic brake booster
  • HV: 20A – Hybrid system
  • EFI: 15A – Multiport fuel injection system/sequential multiport fuel injection system
  • HEAD (LH) / HEAD LO (LH): 10A – Left-hand headlight (low beam with daytime running lights)
  • DOME: 15A – Audio system, multi-information display, interior light, trunk light, power window system, wireless remote control system
  • TURN-HAZ: 10A – Turn signal lights, emergency flasher
  • DC/DC: 100A – ACC relay, IG1 relay, TAIL relay, ABS NO.4, HTR1, HTR2, ABS NO.1, HTR3, EMPS, CDS FAN, RDI, HTR, OBD II, ECU-B, STOP, PWR1, POWER, DOOR, DEF, AM1 fuses
  • HEAD: 30A – Daytime running light system (with daytime running lights)
  • HTR: 50A – Air conditioning system
  • RDI: 30A – Electric cooling fan
  • ABS NO.2: 30A – Hydraulic brake booster

Additional Engine Compartment Fuse Box Assignments:

  • ABS NO.4: 10A – Anti-lock brake system
  • HTR NO.1: 30A – Air conditioning system
  • HTR NO.2: 30A – Air conditioning system
  • DRL: 7.5A – Daytime running light system
  • HTR3: 50A – Air conditioning system
  • EM PS: 50A – Electric power steering
  • ABS NO.1: 40A – Anti-lock brake system

Fusible Link Block:

  • DC/DC-S: 5A – Inverter and converter
  • MAIN: 120A – Multiple high-power circuits including DC/DC, BATT FAN, HORN, TURN-HAZ, DOME, THRO, EFI, AM2, ABS, HV, HEAD

Relays in Engine Compartment: Dimmer (DIM) or short pin, Headlight (HEAD), Fuel pump (C/OPN), Heater (HTR), Daytime running light (DRL), Engine control unit (EFI), A/C compressor clutch (CLR MG), Electric cooling fans (FAN NO.1–3), Ignition (IG2), Horn.

Second Generation Prius (2004–2009, NHW20 / XW20)

Significant updates to hybrid electronics required revised fuse protection. Fuse boxes are in the engine compartment and passenger compartment (driver’s side, under the cover).

Passenger Compartment Fuse Box Assignments:

  • M/HTR: 15A – Outside rear view mirror heater
  • WIP: 30A – Windshield wiper
  • RR WIP: 15A – Rear wiper
  • WSH: 20A – Washer
  • ECU-IG: 7.5A – Smart key system, power windows, touch screen, electric power steering, theft deterrent system
  • GAUGE: 10A – Gauge and meter, backup lights, emergency flasher, power windows
  • OBD: 7.5A – On-board diagnosis system
  • STOP: 7.5A – Stop lights
  • DOOR: 25A – Power door lock system
  • ACC-B: 25A – POWER OUTLET, ACC fuses
  • ECU-B: 15A – Multi-information display, power windows, air conditioning system
  • AM1: 7.5A – Hybrid system
  • TAIL: 10A – Tail lights, license plates light, parking lights
  • PANEL: 7.5A – Multi-information display, clock, audio system, instrument panel lights
  • A/C (HTR): 10A – Air conditioning system
  • FR DOOR: 20A – Power windows
  • PWR OUTLET: 15A – Power outlet
  • ACC: 7.5A – Audio system, multi-information display, clock
  • PWR OUTLET FR: 15A – Power outlet
  • IGN: 7.5A – Hybrid system, hybrid vehicle immobilizer system, SRS airbags

Engine Compartment Fuse Box Assignments:

  • SPARE: 30A / 15A – Spare fuses
  • DRL: 7.5A – Daytime running light system
  • H-LP LO RH: 10A/15A – Right-hand headlight (low beam)
  • H-LP LO LH: 10A/15A – Left-hand headlight (low beam)
  • H-LP HI RH: 10A – Right-hand headlight (high beam)
  • H-LP HI LH: 10A – Left-hand headlight (high beam)
  • EFI: 15A – Multiport fuel injection system/sequential multiport fuel injection system
  • AM2: 15A – IGN fuse, ignition system
  • HORN: 10A – Horn
  • HEV: 20A – Hybrid system
  • P CON MAIN: 7.5A – Parking control system, hybrid vehicle immobilizer system
  • ABS-1: 25A – Anti-lock brake system
  • ETCS: 10A – Electronic throttle control system
  • BATT FAN: 10A – Battery cooling fan
  • HAZ: 10A – Turn signal lights, emergency flasher
  • DOME: 15A – Audio system, interior lights, smart entry and start system, gauge and meter, turn signal lights, luggage room light, clock
  • ABS MAIN3: 15A – Anti-lock brake system
  • ABS MAIN2: 10A – Anti-lock brake system
  • ABS MAIN1: 10A – Anti-lock brake system
  • FR FOG: 15A – Fog lights
  • AMP: 30A – Audio system
  • PTC HTR2: 30A – PTC heater
  • PTC HTR1: 30A – PTC heater
  • CDS FAN: 30A – Electric cooling fan
  • P/I: 60A – AM2, HEV, EFI, HORN fuses
  • HEAD MAIN: 40A – Headlight relay
  • ABS-1: 30A – ABS MTR relay
  • ABS-2: 30A – Anti-lock brake system
  • DC/DC: 100A – Multiple accessory circuits
  • PS HTR: 50A – Air conditioner
  • RDI: 30A – Engine control, radiator fan and condenser fan, Toyota hybrid system
  • HTR: 40A – Air conditioner, Toyota hybrid system
  • ESP: 50A – ESP system

Fusible Link Block:

  • DC/DS-S: 5A – Inverter and converter
  • MAIN: 120A – Hybrid system

Relays: Ignition (IG1), Heater (HTR), Flasher, Anti-lock brake system variants, Headlight, Dimmer, Parking control, Electric cooling fans, ABS MTR.

Third Generation Prius (2010–2015, ZVW30 / XW30)

Advanced safety and infotainment systems increased the number of dedicated circuits. Fuse boxes in passenger compartment (left side under instrument panel) and engine compartment.

Passenger Compartment Fuse Box Assignments:

  • CIG: 15A – Power outlets
  • ECU-ACC: 10A – Multiplex communication system, outside rear view mirrors, driver support system, audio system, navigation system, advanced parking guidance system, head-up display
  • PWR OUTLET: 15A – Power outlets
  • SEAT HTR FR / SEAT HTR FL: 10A – Seat heaters
  • DOOR NO.1: 25A – Power door lock system
  • PSB: 30A – Pre-Collision System
  • PWR SEAT FR / PWR SEAT FL: 30A – Power seats
  • DBL LOCK: 25A – Double locking (RHD)
  • FR FOG: 15A/7.5A – Front fog lights
  • OBD: 7.5A – On-board diagnosis system
  • RR FOG: 7.5A – Rear fog lights
  • STOP: 10A – Stop lights, high mounted stoplight, brake system, driver support system, vehicle proximity notification system
  • P FR DOOR / D FR DOOR: 25A – Power windows (front)
  • DOOR RR / DOOR RL: 25A – Power windows (rear)
  • S/ROOF: 30A – Moon roof
  • ECU-IG NO.1: 10A – Electric cooling fans, multiplex communication system, vehicle proximity notification system
  • ECU-IG NO.2: 10A – Driver support system, Pre-Collision System, LKA system, inside rear view mirror, garage door opener, yaw rate & G sensor, brake system, electric power steering, navigation system, moon roof, tire pressure warning system, seat belt pretensioners, audio system, emergency flashers, turn signal lights, windshield wipers, headlight cleaner
  • GAUGE: 10A – Headlight leveling system, gauges and meters, emergency flashers, turn signal lights
  • A/C: 10A – Air conditioning system, Solar Ventilation System, Remote Air Conditioning System
  • WASHER: 15A – Windshield washer
  • RR WIP: 20A – Rear window wiper and washer
  • WIP: 30A – Windshield wipers
  • MET: 7.5A – Gauges and meters
  • IGN: 10A – Brake system, driver support system, multiport fuel injection system/sequential multiport fuel injection system, SRS airbag system, front passenger occupant classification system, power management system, smart key system, front passenger’s seat belt reminder light
  • PANEL: 10A – Air conditioning system, personal light, transmission, P position switch, navigation system, Solar Ventilation System, Remote Air Conditioning System, advanced parking guidance system, headlight cleaner, front passenger’s seat belt reminder light, headlight leveling system, glove box light, clock, audio system, MPH or km/h switch
  • TAIL: 10A – Headlight leveling system, parking lights, tail lights, license plate lights, front fog lights, side marker lights

Engine Compartment Fuse Box Assignments (key circuits, pre/post Dec 2011 variations noted where applicable):

  • ABS MAIN NO.2: 7.5A – Anti-lock brake system
  • ENG W/P: 30A – Cooling system
  • S-HORN: 10A – Theft deterrent
  • ABS MAIN NO.1: 20A – Anti-lock brake system
  • ETCS: 10A – Multiport fuel injection system/sequential multiport fuel injection system
  • TURN & HAZ: 10A – Turn signal lights
  • ECU-B3: 10A – Air conditioning system
  • MAYDAY: 10A – Mayday system
  • ECU-B2: 7.5A – Smart key system, hybrid system
  • AM2: 7.5A – Power management system
  • P CON MAIN: 7.5A – Shift control system, P position switch
  • DC/DC-S: 5A – Inverter and converter
  • IGCT: 30A – PCU, IGCT NO.2, IGCT NO.3 fuses
  • AMP / AMP NO.1: 30A – Audio system
  • SHORT PIN: – Short pin for ECU-B, RAD NO.1, DOME fuses
  • AMP NO.2: 30A – Audio system, navigation system
  • DRL: 7.5A – Daytime running lights
  • H-LP HI MAIN: 20A – Headlight high beams, daytime running lights
  • IGCT NO.3: 10A – Cooling system
  • EFI NO.2: 10A – Multiport fuel injection system/sequential multiport fuel injection system
  • H-LP RH HI / H-LP LH HI: 10A – Headlight high beams
  • ECU-B: 7.5A – Smart key system, personal lights, gauges and meters, emergency flashers
  • DOME: 10A – Door courtesy lights, luggage compartment light, personal light, interior light, foot lights, vanity lights, inside rear view mirror, garage door opener
  • RAD NO.1: 15A – Audio system, navigation system
  • MIR HTR: 10A – Outside rear view mirror defoggers
  • IGCT NO.2: 10A – Hybrid system, shift control system, power management system, multiport fuel injection system/sequential multiport fuel injection system
  • PCU: 10A – Inverter and converter
  • IG2: 20A – Multiport fuel injection system/sequential multiport fuel injection system, MET, IGN fuses

Fusible Link Block:

  • MAIN: 140A – Multiple high-power circuits including DC/DC, DRL, AMP, H-LP HI MAIN, EPS, ABS MTR, P/I, ECU-B2, AM2, TURN & HAZ, P CON MAIN, ETCS, IGCT, P/I 1

Fourth Generation Prius (2016–2022, XW50)

This generation introduced more advanced safety tech and refined hybrid powertrains. Fuse boxes in the passenger compartment (left side under instrument panel) and engine compartment (left side of engine bay).

Passenger Compartment Fuse Box Assignments:

  • ECU-B NO.2: 7.5A – Air Conditioner, Cruise Control, Door Lock Control, Grille Shutter, Hybrid System, Multiplex Communication System (CAN), Power Window, Remote Control Mirror, Shift Control System, Theft Deterrent, Tire Pressure Warning System, Vehicle Proximity Notification System
  • ECU-B NO.1: 5A – Back Door Opener, Cruise Control, Entry & Start System, Hybrid System, Immobiliser System, Shift Control System, Starting, Steering Lock, Vehicle Proximity Notification System, Wireless Door Lock Control
  • D/L: 20A – Door Lock Control, Back Door Opener, Entry & Start System, Immobiliser System, Starting, Steering Lock, Wireless Door Lock Control
  • STOP: 7.5A – Stop Light, ABS, Back Door Opener, Cruise Control, Dynamic Radar Cruise Control, Entry & Start System, Hybrid System, Immobiliser System, Shift Control System, Starting, Steering Lock, TRC, Vehicle Proximity Notification System, VSC, Wireless Door Lock Control
  • AM2: 7.5A – Back Door Opener, Entry & Start System, Immobiliser System, Starting, Steering Lock, Wireless Door Lock Control
  • HAZ: 10A – Turn Signal and Hazard Warning Light, Back Door Opener, Combination Meter, Entry & Start System, Immobiliser System, Starting, Steering Lock, Wireless Door Lock Control
  • PANEL: 5A – Illumination, Taillight
  • TAIL: 10A – Taillight, Rear Fog Light, Front Fog Light, Illumination
  • DOOR: 20A – Power Window
  • DOOR R/R: 20A – Power Window
  • P/OUTLET NO.1: 15A – Power Outlet
  • WASHER: 15A – Front Wiper and Washer, Rear Wiper and Washer
  • WIPER RR: 15A – Rear Wiper and Washer
  • ECU-IG1 NO.4: 10A – Extensive list including ABS, Air Conditioner, Audio System, Blind Spot Monitor, Combination Meter, Cruise Control, Door Lock, Dynamic Radar Cruise Control, Entry & Start, Fog Lights, Headlight, Hybrid System, Lane Departure Alert, Navigation, Power Window, Pre-Crash Safety, Rear View Monitor, Seat Heater, Shift Control, Sliding Roof, SRS, Tire Pressure Warning, VSC, Wireless Charger
  • BKUP LP: 7.5A – Back-Up Light, Audio System, Back Guide Monitor System, Navigation System, Rear View Monitor System
  • ECU-IG1 NO.2: 5A – ABS, TRC, VSC
  • FOG RR: 7.5A – Rear Fog Light
  • OBD: 7.5A – On-Board Diagnosis System
  • DOME: 7.5A – Interior Light, Back Door Opener, Entry & Start System, Immobiliser System, Starting, Steering Lock, Wireless Door Lock Control
  • DOOR BACK: 7.5A – Back Door Opener, Entry & Start System, Immobiliser System, Starting, Steering Lock, Wireless Door Lock Control
  • ECU-DCC NO.2: 10A – Extensive list including ABS, Air Conditioner, Audio System, Back Guide Monitor, Combination Meter, Cruise Control, Door Lock, Dynamic Radar Cruise Control, Engine Control, Entry & Start, EPS, Fog Light, Fuel Lid Opener, Grille Shutter, Headlight, Hybrid System, Lane Departure Alert, Navigation, Power Window, Pre-Crash Safety, Rear View Monitor, Remote Control Mirror, Seat Belt Warning, Shift Control, Sliding Roof, SRS, Starting, Steering Lock, Telematics, Theft Deterrent, Tire Pressure Warning, TRC, Turn Signal, VSC, Wireless Charger, Wireless Door Lock
  • ECU-DCC NO.1: 5A – ABS, TRC, VSC
  • RADIO: 15A – Audio System, Back Guide Monitor System, Navigation System, Rear View Monitor System
  • DOOR R/L: 20A – Power Window
  • ECU-ACC: 5A – Extensive list including ABS, Air Conditioner, Audio System, Automatic Light Control, Back Door Opener, Back Guide Monitor, Combination Meter, Door Lock, Entry & Start, Fog Light, Headlight, Illumination, Immobiliser System, Interior Light, Navigation, Power Outlet, Power Window, Rear Fog Light, Rear View Monitor, Remote Control Mirror, Seat Belt Warning, Sliding Roof, Starting, Steering Lock, Taillight, Telematics, Theft Deterrent, Tire Pressure Warning, TRC, VSC, Wireless Charger, Wireless Door Lock
  • ECU-IG1 NO.3: 7.5A – Air Conditioner, Dynamic Radar Cruise Control, Headlight, Headlight Beam Level Control, Illumination, Lane Departure Alert, Mirror Heater, Pre-Crash Safety System, Rear Window Defogger, Taillight
  • EPS-IG1: 5A – EPS
  • A/BAG-IG2: 10A – SRS, Seat Belt Warning
  • METER-IG2: 5A – Extensive list including ABS, Air Conditioner, Audio System, Automatic Light Control, Back Door Opener, Back Guide Monitor, Combination Meter, Cruise Control, Dynamic Radar Cruise Control, Engine Control, Entry & Start, EPS, Fog Light, Fuel Lid Opener, Grille Shutter, Headlight, Hybrid System, Illumination, Immobiliser System, Lane Departure Alert, Navigation, Power Window, Pre-Crash Safety, Rear Fog Light, Rear View Monitor, Seat Belt Warning, Shift Control, Sliding Roof, SRS, Starting, Steering Lock, Taillight, Telematics, Theft Deterrent, Tire Pressure Warning, TRC, Turn Signal, VSC

Fifth Generation Prius (2023–Present, XW60 / ZVW60 / MXWH60, including Prime)

The latest generation features even more integrated electronics and optional plug-in hybrid systems. Two main fuse panels: Engine fuse panel (left side of engine bay) and Interior fuse panel (under instrument panel, left side).

Engine Fuse Panel Assignments (2023+):

  • PCU NO.2: 10A – HEV
  • PCU NO.1: 10A – HEV
  • SBW-IGCT: 5A – Shift control
  • PM-IGCT: 10A – Power management
  • IGCT NO.2: 10A – Hybrid control
  • EFI NO.5: 10A – Engine control
  • EFI NO.3: 10A – Engine control
  • WASHER: 15A – Windshield washer
  • IGN: 10A – Ignition system
  • ECU-IGP NO.1: 5A – Engine control unit
  • ECU-IGP NO.3: 10A – Engine control unit
  • EFI NO.2: 10A – Engine control
  • EFI NO.4: 10A – Engine control
  • BATT FAN / PCU NO.1: 10A – Battery cooling fan (HEV) / PCU (PHEV)
  • INV W/PMP / PCU NO.2: 5A/10A – Inverter water pump (HEV) / PCU (PHEV)
  • H-LP RH: 10A – Right headlight
  • EFI-MAIN NO.2: 25A/10A – Engine control (varies by motor: M20A-FXS or 2ZR-FXE)
  • INV W/PMP NO.2: 10A – Inverter water pump
  • ECU-B NO.5: 15A – Body control
  • EFI-MAIN NO.1: 30A – Engine control
  • E-LATCH RL: 10A – Electronic latch rear left
  • H-LP LH: 10A – Left headlight
  • STRG HTR: 10A – Steering heater
  • BATT-S NO.2: 10A – Battery sensor
  • BATT-S: 5A – Battery sensor
  • EFI-MAIN NO.3: 30A – Engine control
  • ECU-B: 10A – Body control
  • DMC: 10A – Drive mode control
  • E-LATCH RR: 10A – Electronic latch rear right
  • IGP-MAIN: 25A – Ignition power
  • EFI NO.1: 5A – Engine control
  • D/C CUT: 30A – DC cut relay
  • D-INJ: 20A – Direct injection
  • WIPER: 30A – Windshield wiper
  • VVT: 20A – Variable valve timing
  • HORN: 10A – Horn
  • 2ND BATT: 30A – Second battery
  • S-HORN: 10A – Security horn
  • P-CON MTR: 20A – Parking control motor
  • DEICER: 15A – Deicer
  • PLUG LOCK: 15A – Plug lock (PHEV)
  • S/HTR RR: 15A – Rear seat heater
  • AMD2 CHG: 10A – AMD2 charger
  • IG-B: 7.5A – Ignition backup
  • P-CON MAIN: 10A – Parking control main
  • PWC: 5A – Power window control

High-Amperage Fuses and Multi-Fuse Blocks: IGCT-MAIN NO.2 (30A), HTR (40A), FAN NO.1 (30A), FAN NO.2 (30A/40A HEV/PHEV), DC/DC, IGCT-MAIN NO.1, ABS MTR NO.1, EPS, INP STD variants, ABS NO.1/2/MAIN.

Relays in Engine Panel: H-LP LH/RH, EFI-MAIN variants, D-INJ, IGCT-MAIN variants, VVT/C/OPN, WIPER, HORN, IGP, INV W/PMP variants, FAN variants, DEICER, IG-B, A/C MG/V.

Interior Fuse Panel Assignments (selected key circuits):

  • +BA NO.2: 5A – Backup power
  • DOOR R/R / DOOR R/L: 20A – Rear door power windows/locks
  • ECU-B NO.3: 10A – Engine control unit
  • DOOR BACK: 10A – Back door
  • OBD: 7.5A – On-board diagnostics
  • DOOR F/R / DOOR F/L: 20A – Front door power windows/locks
  • D/L: 15A – Power door lock system
  • ECU-DCC NO.2 / ECU-DCC NO.1: 10A/5A – Engine control unit
  • RADIO: 15A – Radio and audio system
  • HAZ: 10A – Hazard light
  • FUEL OPN: 10A – Fuel lid opener
  • TAIL: 7.5A – Tail lights
  • PANEL: 3A – Instrument panel illumination

By referencing these complete diagrams tailored to your specific Prius generation and model year, you can quickly diagnose and resolve electrical faults while maintaining the reliability that has made the Prius a hybrid icon for nearly three decades. Regular visual inspection of fuses during routine maintenance helps prevent unexpected downtime.

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