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Fuse box diagram (fuse layout), location, and assignment of fuses and relays Toyota iQ and Scion iQ (2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015).
Checking and Replacing Fuses
The fuses are designed to blow before the entire wiring harness is damaged. If any of the electrical components do not operate, a fuse may have blown. If this happens, check and replace the fuses as necessary.
- Turn the engine switch off (with a smart key system – turn the “ENGINE START STOP” switch off) and turn off all electrical accessories.
- Open the fuse box cover.
- See diagrams below for details about which fuse to check.
- Remove the fuse.
- Check if the fuse is blown – if the thin wire inside is broken, the fuse has blown.
- Replace the blown fuse with a new fuse of an appropriate amperage rating.
Notice
- Never use a fuse of a higher amperage rating than that indicated, or use any other object in place of a fuse, even as a temporary fix. This can cause extensive damage or even fire.
- Always use a genuine Toyota fuse or equivalent.
- Do not modify the fuses or fuse boxes.
- If the replaced fuse blows again, have the vehicle inspected by any authorized Toyota dealer or repairer, or another duly qualified and equipped professional.
Passenger Compartment
Left-hand drive
Right-hand drive
- Steering Lock Actuator
- Fuse Box
- Power Steering ECU
- Relay Box
- Turn Signal Flasher
- Windshield Wiper Relay
- Gasoline: Power Management Control ECU
Diesel: Power Source Control ECU - Engine Stop and Start ECU
- Transponder Key Amplifier
- Airbag Sensor Assembly
- Shift Lock Control ECU
- A/C Amplifier
- RHD: Double Lock Door Control Relay
Passenger Compartment Fuse Box Diagram
Left-hand drive
The fuse panel is located under the driver’s side of the dashboard. Remove the lid.
Right-hand drive
The fuse panel is behind the lid on the passenger’s side of the dashboard. Remove the cover (use a flathead screwdriver which is wrapped with a cloth), and remove the lid.
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| № | Fuse | A | Circuit |
|---|---|---|---|
| 1 | ECU-IG №1 | 7.5 | Vehicle stability control system, shift lock control system, electric power steering, automatic headlight system, main body ECU, tire pressure warning system |
| 2 | GAUGE | 10 | Electric cooling fan(s), charging system, emergency flashers, front passenger’s seat belt reminder light, back-up lights, multiport fuel injection system/sequential multiport fuel injection system, windshield wiper ECU, auto anti-glare inside rear view mirror |
| 3 | HTR-IG | 10 | Air conditioning system, wiper deicer, rear window defogger |
| 4 | - | - | - |
| 5 | WASHER RR | 10 | Windshield washer |
| 6 | WIPER RR | 10 | Rear window wiper |
| 7 | WIPER FR | 25 | Windshield wipers |
| 8 | WASHER FR | 10 | Windshield washer |
| 9 | OBD | 7.5 | On-board diagnosis system |
| 10 | FOG RR | 7.5 | Rear fog light |
| 11 | PANEL №2 | 5 | with Daytime Running Light or Automatic Light Control: Daytime running light system |
| TAIL №1 | 10 | Manual headlight leveling dial, front position lights, tail lights, license plate lights | |
| 12 | DOOR №2 | 20 | Power windows |
| 13 | D/L №1 | 15 | Power door lock system, main body ECU |
| 14 | DOOR №1 | 30 | Power windows |
| 15 | - | - | - |
| 16 | - | - | - |
| 17 | CIG | 15 | Power outlet |
| 18 | ACC | 5 | Outside rear view mirrors, audio system, shift lock control system, main body ECU |
| 19 | PANEL №1 | 5 | with Automatic Light Control: Meter |
| PANEL | 5 | Meter, power management ECU | |
| 20 | TAIL | 10 | with Automatic Light Control: Front position lights, tail lights, license plate lights, rear fog light, front fog lights, manual headlight leveling dial, multiport fuel injection system/sequential multiport fuel injection system, instrument cluster, windshield wiper ECU |
| TAIL №2 | 10 | Front position lights, tail lights, license plate lights, rear fog light, front fog lights, manual headlight leveling dial, multiport fuel injection system/sequential multiport fuel injection system, instrument cluster, windshield wiper ECU | |
| 21 | FOG FR | 15 | Front fog lights |
| 22 | AM1 | 7.5 | "ACC" fuse, starting system |
| 23 | STOP | 10 | Vehicle stability control system, power management ECU, shift lock control system, stop lights, multiport fuel injection system/sequential multiport fuel injection system |
| 24 | D/L №2 | 10 | Power door lock system |
| 25 | SEAT-HTR | 15 | Seat heaters |
| 26 | - | - | - |
| 27 | - | - | - |
| 28 | - | - | - |
| 29 | - | - | - |
| 30 | - | - | - |
| 31 | - | - | - |
| 32 | - | - | - |
| 33 | - | - | - |
| 34 | - | - | - |
| 35 | - | - | - |
| 36 | - | - | - |
| 37 | - | - | - |
| 38 | - | - | - |
| 39 | - | - | - |
Relay Box
| № | Relay |
|---|---|
| R1 | Front fog light (FR FOG) |
| R2 | Heater (HTR) |
| R3 | Panel light (PANEL) |
Engine Compartment
- Fusible Link Block
- Fuse Box
- Diesel: ECM
- Gasoline: ECM
- Relay Box
- LHD: Skid Control ECU with Actuator
- Glow Plug Relay
- RHD: Skid Control ECU with Actuator
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Engine Compartment Fuse Box Diagram
Push the tab in and lift the lid off.
| № | Fuse | A | Circuit |
|---|---|---|---|
| 1 | - | - | - |
| 2 | - | - | - |
| 3 | DEFOGGER | 30 | Gasoline: Rear window defogger |
| DEFOGGER №1 | 30 | Diesel: Rear window defogger | |
| 4 | - | - | - |
| 5 | WIP-S | 7.5 | Gasoline: Power management ECU |
| DEFOGGER №2 | 7.5 | Diesel: Power Source Control ECU | |
| 6 | MIR HTR | 7.5 | Outside rear view mirror defoggers |
| 7 | DOME | 15 | Interior light, audio system |
| 8 | ECU-B №1 | 7.5 | Main body ECU, power door lock system, smart entry & start system |
| 9 | H-LP LO | 20 | Toyota: |
| with Daytime Running Light or Automatic Light Control: Headlight (low beam) | |||
| H-LP LH | 10 | Toyota: | |
| without Daytime Running Light or Automatic Light Control: Headlight (low beam)Left-hand headlight | |||
| H-LP MAIN | 20 | Scion (with Daytime Running Light): "H-LP RH LO", "H-LP LH LO" fuses | |
| 10 | AM2 №2 | 7.5 | Power management ECU |
| 11 | ECU-B №2 | 5 | Meter, power windows, air conditioning system |
| 12 | ETCS | 10 | Electronic throttle control system |
| 13 | TURN&HAZ | 10 | Turn signal lights, emergency flashers |
| 14 | IMMOBI | 7.5 | Smart entry & start system |
| 15 | D/C CUT | 30 | "ECU-B №1", "DOME" fuses |
| 16 | EFI №1 | 10 | Gasoline: Multiport fuel injection system/sequential multiport fuel injection system |
| ECD №1 | 10 | Diesel: Multiport fuel injection system/sequential multiport fuel injection system | |
| 17 | IG2 | 10 | SRS airbag system, meter |
| 18 | IGN | 15 | Gasoline: Injection, igniter |
| ECD №2 | 7.5 | Diesel: Multiport fuel injection system/sequential multiport fuel injection system | |
| 19 | ALT-S | 7.5 | Charging system |
| 20 | EFI-MAIN | 20 | Gasoline: Multiport fuel injection system/sequential multiport fuel injection system, "EFI №1" fuse, fuel pump |
| ECD-MAIN | 30 | Diesel: Multiport fuel injection system/sequential multiport fuel injection system | |
| 21 | HORN | 10 | Horn |
| 22 | AM2 №1 | 30 | Starting system |
| 23 | - | - | - |
| 24 | H-LP HI | 7.5 | Toyota: |
| without Daytime Running Light or Automatic Light Control: Right-hand headlight | |||
| 25 | STRG LOCK | 20 | Steering lock system |
| 26 | H-LP RH | 10 | Toyota: |
| with Daytime Running Light or Automatic Light Control: Headlight (high beam) | |||
| H-LP MAIN HI | 25 | Scion: "H-LP RH HI", "H-LP LH HI" fuses | |
| 27 | ABS №2 | 30 | Anti-lock brake system |
| 28 | HTR-B | 40 | "HTR", "BLR" fuses |
| 29 | FUEL HTR | 30 | Fuel heater |
| 30 | ABS №1 | 50 | Anti-lock brake system |
| 31 | RDI | 30 | Electric cooling fan |
| 32 | EPS | 50 | Electric power steering |
| 33 | BBC | 40 | Stop & Start system |
| R1 | Electric cooling fan (FAN №2) | ||
| R2 | Starter (ST) | ||
| R3 | Rear window defogger (DEFOGGER) | ||
| R4 | Theft deterrent (S-HORN) | ||
| R5 | Electric cooling fan (FAN №1) | ||
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Relay Box
Push the tab in and lift the lid off.
| № | Fuse | A | Circuit |
|---|---|---|---|
| 1 | PWR HTR | 25 | PTC heater |
| DEICER | 20 | Windshield wiper de-icer | |
| PTC №2 | 30 | PTC heater | |
| 2 | - | - | - |
| 3 | H-LP LH LO | 10 | Left-hand headlight (low beam) |
| 4 | H-LP RH LO | 10 | Right-hand headlight (low beam) |
| 5 | H-LP LH HI | 10 | Scion: Left-hand headlight (high beam) |
| 6 | H-LP RH HI | 10 | Scion: Right-hand headlight (high beam) |
| 7 | PTC №2 | 30 | PTC heater |
| 8 | PTC №3 | 30 | PTC heater |
| 9 | - | - | - |
| 10 | - | - | - |
| 11 | PTC №1 | 30 | 1KR-FE: PTC heater |
| PTC №1 | 50 | Except 1KR-FE: PTC heater | |
| R1 | 1KR-FE: PTC heater (PTC №1) | ||
| R2 | - | ||
| R3 | PTC heater (PTC №2) | ||
| R4 | PTC heater (PTC №3) | ||
| R5 | - | ||
| R6 | Dimmer (DIM) | ||
| R7 | Headlight (H-LP) | ||
| R8 | Except 1KR-FE: PTC heater (PTC №1) | ||
Fusible Link Block
It is on the battery positive terminal. Remove the cover.
| № | Fuse | A | Circuit |
|---|---|---|---|
| 1 | GLOW DC/DC | 80 | Diesel: Engine control |
| 2 | MAIN | 80 | "EFI MAIN", "EFI №1", "HORN", "AM2 №1", "AM2 №2", "DOME", "ECU-B №2", "TURN&HAZ", "H-LP LO", "H-LP LH LO", "H-LP MAIN", "H-LP MAIN HI", "ECU-B №1", "D/C CUT", "ETCS", "H-LP HI", "IG2", "IGN", "ALT-S" fuses |
| 3 | ALT | 120 | Charging system, "RDI", "ABS №1", "ABS №2", "HTR-B", "ACC", "CIG", "GAUGE", "ECU IG №1", "HTR-IG", "WIPER WASHER", "AM1", "DOOR №1", "STOP", "DOOR №2", "OBD", "RR FOG", "FR FOG", "DEF", "TAIL", "TAIL №2", "EPS", "PTC №1", "PTC №2", "PTC №3", "DEICER", "D/L №1", "D/L №2", "PANEL", "PANEL №1" fuses |
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