Following the launch of the Aqua hybrid in Japan, Toyota exported the model as the Prius c. This hatchback was marketed across North America (US and Canada), Australia, and select countries in the Asia-Pacific region. This article provides detailed fuse box diagrams and relay layouts for the first-generation Toyota Prius c / Aqua (chassis code NHP10; B platform; model years 2012–2019).
Below you will find fuse box locations, layout diagrams, and photos. Fuses for the Cigarette Lighter / Power Outlet and Fuel Pump are highlighted in bold.
Engine Compartment
There are two fuse boxes in the engine compartment: the main unit on the right side and an auxiliary box on the left.
Main Fuse Box
To access the main fuse box, release the cover retaining tabs and lift the cover upward.
| Diagram | ||
|---|---|---|
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| No. | Circuit / Protected Component | A |
| 1 | Multiport fuel injection system, EFI NO. 2 (EFI-MAIN) | 20 |
| 2 | Horn (HORN) | 10 |
| 3 | Meter / gauge assembly, ignition switch (COUNTER, IGN2) | 30 |
| 4 | Spare fuse | 7.5 |
| 5 | Spare fuse | 15 |
| 6 | Spare fuse | 30 |
| 7 | Multiport fuel injection system (EFI2) | 10 |
| 8 | Right headlight (low beam) (H-LP RH-LO) | 10 |
| 9 | Left headlight (low beam), sensors, meters (H-LP LH-LO) | 10 |
| 10 | Right headlight (high beam) (H-LP RH-HI) | 10 |
| 11 | Left headlight (high beam), sensors, meters (H-LP LH-HI) | 10 |
| 12 | Multiport fuel injection system, steering wheel switches, ABS, starter system, Smart Key system, occupant classification system, SRS airbag system (IG2 #2) | 10 |
| 13 | Audio system, vehicle control unit, event data recorder, main body ECU, interior lights, luggage compartment lighting (DOME) | 15 |
| 14 | Main body ECU, Smart Key system (ECU-B1) | 7.5 |
| 15 | Instrument cluster / meters (METER) | 7.5 |
| 16 | Multiport fuel injection system (IGN) | 15 |
| 17 | Hazard warning lights (HAZ) | 10 |
| 18 | Electronic Throttle Control System (ETCS) | 10 |
| 19 | Anti-lock brake system (ABS1) | 20 |
| 20 | Multiport fuel injection system, Fuel Pump (ENG W/PMP) | 30 |
| 21 | Headlights, daytime running light system (H-LP-MAIN) | 40 |
| 22 | Headlight cleaners / washers (H-LP CLN) | 30 |
| 23 | ABS pump motor (ABS MTR1) | 30 |
| 24 | EFI-MAIN, HORN, IG2 (P/I) | 50 |
| 25 | Air conditioning system, instrument cluster, occupant classification system, tire pressure monitoring system, starter system, Smart Key system, power door locks (ECU-B2) | 7.5 |
| 26 | Starter system / ignition switch (AM2) | 7.5 |
| 27 | Steering lock system (STRG LOCK) | 20 |
| 28 | Anti-lock brake system (ABS2) | 10 |
| 29 | Hybrid control system circuits, Power Control Unit, traction battery cooling fan (IGCT-MAIN) | 30 |
| 30 | DOME, ECU-B #1 (D/C) | 30 |
| 31 | PTC auxiliary heater No. 1 | 30 |
| 32 | PTC auxiliary heater No. 2 | 30 |
| 33 | Radiator cooling fan (FAN) | 30 |
| 34 | PTC auxiliary heater No. 3 | 30 |
| 35 | Outside mirror heaters, rear window defogger (DEF) | 30 |
| 36 | Windshield wiper de-icer [if equipped] (DEICER) | 20 |
| 37 | Traction battery cooling fan (BATT FAN) | 10 |
| 38 | Hybrid system (IGCT2) | 10 |
| 39 | Hybrid system (IGCT4) | 10 |
| 40 | Power Control Unit (PCU) | 10 |
| 41 | Hybrid system (IGCT3) | 10 |
| 42 | Heated outside mirrors (MIR HTR) | 10 |
| Fuse box cover diagram showing relay locations | ||
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Auxiliary Fuse Box
The auxiliary fuse box is located on the right side of the engine compartment.
| Diagram | ||
|---|---|---|
|
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| 1 | Hybrid System DC/DC Converter (DC/DC) | 100 |
| 2 | ABS Motor 2 / Brake System (ABS MTR2) | 30 |
| 3 | Air Conditioning System (HTR) | 40 |
| 4 | Electric Power Steering (EPS) | 50 |
Passenger Compartment
Prius c (LHD): Located under the dashboard on the driver's side.
Aqua (RHD): Located behind the glove box on the passenger side.
Example of fuse box access.
| Diagram | ||
|---|---|---|
|
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| No. | Circuit / Protected Component | A |
| 1 | Parking lights, side marker lights, tail lights, license plate lights, front fog lights, sensors and gauges | 10 |
| 2 | Instrument panel illumination | 5 |
| 3 | Rear right power window (DOOR R/R) | 20 |
| 4 | Front passenger power window (DOOR P) | 20 |
| 5 | Rear window defogger, tire pressure monitoring system, main body ECU, ABS/VSC system, power door locks, Smart Key system (ECU-IG #1) | 5 |
| 6 | Electric Power Steering (ECU-IG #2) | 5 |
| 7 | Air conditioning system, PTC heater (HTR-IG) | 7.5 |
| 8 | Backup lights, audio system, shift lock control system, moonroof, vehicle proximity notification system, event data recorder (GAUGE) | 10 |
| 9 | Windshield washer (WASHER) | 15 |
| 10 | Windshield wipers (WIPER) | 25 |
| 11 | Rear window wiper and washer (WIPER RR) | 15 |
| 12 | Power windows (P/W) | 30 |
| 13 | Rear left power window (DOOR R/L) | 20 |
| 14 | Front driver power window (DOOR D) | 20 |
| 15 | 12V Power Outlet / Cigarette Lighter Fuse (CIG) | 15 |
| 16 | Main body ECU, audio system, power outside mirrors, shift lock control system (ACC) | 5 |
| 17 | Power door lock system (D/L) | 25 |
| 18 | On-Board Diagnostics system (OBD) | 7.5 |
| 19 | Brake lights, high-mount stop light, starter system, shift lock control system, vehicle proximity notification system (STOP) | 7.5 |
| 20 | Starter system / ignition switch (AM1) | 7.5 |
| 21 | Front fog lights (FOG FR) | 15 |
| 22 | Moonroof / Sunroof (S/ROOF) | 25 |
| 23 | Seat heaters (S/HTR) | 15 |