Fuses protect the Toyota Tundra’s electrical circuits by interrupting the flow of current if a circuit is overloaded. Relays act as electrically controlled switches for systems that need more power. Both help protect the vehicle’s wiring and electrical components.
Knowing the Toyota Tundra fuse box location can make it easier to investigate problems such as non-working lights, power windows, or other electrical faults. Standard Cab and Access Cab models generally have the same main fuse-panel locations, although fuse and relay assignments can vary by engine, trim, and equipment.
MUST READ: DYI – How to Check Car Fuses?
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Toyota Tundra (Standard and Access Cab) (2003–2006) fuse assignment
Toyota Tundra (Standard and Access Cab) Year of production: 2003, 2004, 2005, 2006
Checking and Replacing Fuses in Toyota Tundra Standard and Access cab
If the headlights or other electrical components do not work, check the fuses. If any of the fuses are blown, they must be replaced.
- Turn the ignition switch and inoperative component off.
- Determine which fuse may be causing the problem. The lid of the fuse box shows the name of the circuit for each fuse.
- Pull a suspected fuse straight out and check it.
- If the fuse has blown, push a new fuse into the clip. Only install a fuse with the amperage rating designated on the fuse box lid.
Location of Fuse Boxes
Interior Fuse Panel
The interior fuse panel is beneath the dashboard on the driver’s side, above the footwell and near the steering column. Switch off the ignition, then look for the small access cover on the lower dashboard. Release its clips gently and remove the cover to reach the fuses.
Use the markings on the cover or the owner’s manual to identify the fuse number, circuit, and amperage. The correct diagram is important because equipment and circuit assignments may differ between Tundra versions.
Engine-Compartment Fuse and Relay Boxes
The main under-hood fuse and relay box is in the engine compartment, near the battery or along the inner fender. With the ignition off, open the hood and look for a black plastic box with a removable cover. Release the cover tabs carefully; do not force them.
This box contains fuses and relays for engine, lighting, and other vehicle systems. Depending on the Tundra’s configuration, some relays may be in a separate nearby relay block. Check the vehicle-specific relay diagram to confirm a component’s location and purpose. Do not swap relays just because they look alike.
The factory fuse panels are generally in the cabin and engine compartment rather than the cargo area. Aftermarket equipment may have its own separate inline fuse, so check its instructions if an added accessory is not working.
Fuse Box Diagrams
2003
Engine Compartment Fuse Box
List of fuses in the engine compartment (2003)
| № | Fuse | A | Function |
|---|---|---|---|
| 1 | MIR HTR | 15A | Outside rear view mirror heaters |
| 2 | FOG | 15A | Front fog lights |
| 3 | TOW BRK | 30A | Trailer brake controller |
| 4 | SUB BATT | 30A | Trailer sub battery |
| 5 | TOW TAIL | 30A | Trailer lights (tail lights) |
| 6 | PWR OUTLET | 15A | Power outlet |
| 7 | ECU-B | 5A | Anti-lock brake system |
| 8 | H-LP RH | 10A | Right-hand headlight (high beam) |
| 9 | PWR OUTLET | 15A | Power outlet |
| 10 | DOME | 10A | Interior light, personal lights, vanity light, ignition switch light, step light, door courtesy lights, open door warning light |
| 11 | H-LP LH | 10A | Left-hand headlight (high beam) |
| 12 | EFI NO.2 | 10A | Multiport fuel injection system / sequential multiport fuel injection system, emission control system |
| 13 | RADIO | 20A | Audio system |
| 14 | HEAD RL | 10A | Right-hand headlight (low beam) (with daytime running light system) |
| 15 | A/C | 10A | Air conditioning system |
| 16 | HEAD LL | 10A | Left-hand headlight (low beam) (with daytime running light system) |
| 17 | ALT-S | 7.5A | Charging system |
| 18 | ETCS | 10A | Multiport fuel injection system / sequential multiport fuel injection system, electronic throttle control system (2UZ-FE engine) |
| 19 | HAZ | 15A | Emergency flashers |
| 20 | EFI NO.1 | 20A | Multiport fuel injection system / sequential multiport fuel injection system, fuel pump, “EFI NO.2” fuse |
| 21 | AM2 | 30A | Ignition system, starting system, “IGN” and “STA” fuses |
| 22 | TOWING | 30A | Towing converter |
| 23 | ETCS | 15A | Multiport fuel injection system / sequential multiport fuel injection system, electronic throttle control system (5VZ-FE engine) |
| 37 | AM1 | 40A | Starting system, “ACC”, “WIP”, “4WD”, “ECU-IG”, “GAUGE” and “TURN” fuses |
| 38 | HTR | 50A | Air conditioning system, “A/C” fuse |
| 39 | J/B | 50A | “POWER”, “CARGO LP”, “TAIL”, “OBD”, “HORN” and “STOP” fuses |
| 40 | ABS 2 | 40A | Anti-lock brake system |
| 41 | ABS 3 | 30A | Anti-lock brake system |
| 42 | ST3 | 30A | Starting system, “STA” fuse |
| 44 | FL ALT | 100A*1 140A*2 | “AM1”, “HTR”, “J/B”, “MIR HTR”, “FOG”, “TOW BRK”, “SUB BATT”, “TOW TAIL”, “PWR OUTLET 1” and “PWR OUTLET 2” fuses |
| *1) without towing package *2) with towing package | |||
Instrument Panel Fuse Box
List of fuses in the instrument panel (2003)
| № | Fuse | A | Function |
|---|---|---|---|
| 24 | WIP | 20A | Windshield wipers and washer |
| 25 | TURN | 5A | Turn signal lights |
| 26 | ECU IG | 5A | Anti-lock brake system, cruise control system |
| 27 | 4WD | 20A | Four-wheel drive control system, A.D.D. control system |
| 28 | ACC | 15A | Cigarette lighter, audio system, SRS airbag system, power rear view mirrors, “PWR OUTLET 1” and “PWR OUTLET 2” fuses |
| 29 | GAUGE | 10A | Gauges and meters, back-up lights, starting system, air conditioning system |
| 30 | IGN | 5A | SRS airbag system, multiport fuel injection system / sequential multiport fuel injection system, discharge warning light, ignition system |
| 31 | CARGO LP | 5A | Cargo lamp |
| 32 | TAIL | 15A | Tail lights, license plate lights, instrument panel lights, parking lights, glove box light |
| 33 | OBD | 7.5A | On-board diagnosis system |
| 34 | HORN | 10A | Horns |
| 35 | STA | 5A | Multiport fuel injection system / sequential multiport fuel injection system, gauges and meters |
| 36 | STOP | 15A | Stoplights, high mounted stoplight |
| 43 | POWER | 30A | Power door lock system, power windows, power seat |
2004
Engine Compartment Fuse Box
List of fuses in the engine compartment (2004)
| № | Fuse | A | Function |
|---|---|---|---|
| 1 | MIR HTR | 15A | Outside rear view mirror heaters |
| 2 | FOG | 15A | Front fog lights |
| 3 | TOW BRK | 30A | Trailer brake controller |
| 4 | SUB BATT | 30A | Trailer sub battery |
| 5 | TOW TAIL | 30A | Trailer lights (tail lights) |
| 6 | PWR OUTLET | 15A | Power outlet |
| 7 | ECU-B | 5A | Anti-lock brake system |
| 8 | H-LP RH | 10A | Right-hand headlight (high beam) |
| 9 | PWR OUTLET 2 | 15A | Power outlet |
| 10 | DOME | 10A | Interior light, personal lights, vanity light, ignition switch light, step light, door courtesy lights, open door warning light |
| 11 | H-LP LH | 10A | Left-hand headlight (high beam) |
| 12 | EFI NO.2 | 10A | Multiport fuel injection system / sequential multiport fuel injection system, emission control system |
| 13 | RADIO | 20A | Audio system |
| 14 | HEAD RL | 10A | Right-hand headlight (low beam) (with daytime running light system) |
| 15 | A/C | 10A | Air conditioning system |
| 16 | HEAD LL | 10A | Left-hand headlight (low beam) (with daytime running light system) |
| 17 | ALT-S | 7.5A | Charging system |
| 18 | ETCS | 10A | Multiport fuel injection system / sequential multiport fuel injection system, electronic throttle control system (2UZ-FE engine) |
| 19 | HAZ | 15A | Emergency flashers |
| 20 | EFI NO.1 | 20A | Multiport fuel injection system / sequential multiport fuel injection system, fuel pump, “EFI NO.2” fuse |
| 21 | AM2 | 30A | Ignition system, starting system, “IGN” and “STA” fuses |
| 22 | TOWING | 30A | Towing converter |
| 23 | ETCS | 15A | Multiport fuel injection system / sequential multiport fuel injection system, electronic throttle control system (5VZ-FE engine) |
| 37 | AM1 | 40A | Starting system, “ACC”, “WIP”, “4WD”, “ECU-IG”, “GAUGE” and “TURN” fuses |
| 38 | HTR | 50A | Air conditioning system, “A/C” fuse |
| 39 | J/B | 50A | “POWER”, “CARGO LP”, “TAIL”, “OBD”, “HORN” and “STOP” fuses |
| 40 | ABS 2 | 50A | Anti-lock brake system |
| 41 | ABS 3 | 30A*1 50A*2 | Anti-lock brake system, vehicle stability control system, traction control system |
| 42 | ST3 | 30A | Starting system, “STA” fuse |
| 44 | FL ALT | 100A*3 140A*4 | “AM1”, “HTR”, “J/B”, “MIR HTR”, “FOG”, “TOW BRK”, “SUB BATT”, “TOW TAIL”, “PWR OUTLET 1” and “PWR OUTLET 2” fuses |
| *1) without vehicle stability control system *2) with vehicle stability control system *3) without towing package *4) with towing package | |||
Instrument Panel Fuse Box
List of fuses in the instrument panel (2004)
| № | Fuse | A | Function |
|---|---|---|---|
| 24 | WIP | 20A | Windshield wipers and washer |
| 25 | TURN | 5A | Turn signal lights |
| 26 | ECU IG | 5A | Anti-lock brake system, cruise control system |
| 27 | 4WD | 20A | Four-wheel drive control system, A.D.D. control system |
| 28 | ACC | 15A | Cigarette lighter, audio system, SRS airbag system, power rear view mirrors, “PWR OUTLET 1” and “PWR OUTLET 2” fuses |
| 29 | GAUGE | 10A | Gauges and meters, back-up lights, starting system, air conditioning system |
| 30 | IGN | 5A | SRS airbag system, multiport fuel injection system / sequential multiport fuel injection system, discharge warning light, ignition system |
| 31 | CARGO LP | 5A | Cargo lamp |
| 32 | TAIL | 15A | Tail lights, license plate lights, instrument panel lights, parking lights, glove box light |
| 33 | OBD | 7.5A | On-board diagnosis system |
| 34 | HORN | 10A | Horns |
| 35 | STA | 5A | Multiport fuel injection system / sequential multiport fuel injection system, gauges and meters |
| 36 | STOP | 15A | Stoplights, high mounted stoplight |
| 43 | POWER | 30A | Power door lock system, power windows, power seat |
2005
Engine Compartment Fuse Box
List of fuses in the engine compartment (2005)
| № | Fuse | A | Function |
|---|---|---|---|
| 1 | MIR HTR | 15A | Outside rear view mirror heaters |
| 2 | FOG | 15A | Front fog lights |
| 3 | TOW BRK | 30A | Trailer brake controller (with towing package) |
| 4 | SUB BATT | 30A | Trailer sub battery (with towing package) |
| 5 | TOW TAIL | 30A | Trailer lights (tail lights) |
| 6 | SPARE | 30A | Spare fuse |
| 7 | SPARE | 15A | Spare fuse |
| 8 | SPARE | 20A | Spare fuse |
| 9 | SPARE | 10A | Spare fuse |
| 10 | PWR OUTLET | 15A | Power outlets |
| 11 | ECU-B | 5A | Vehicle stability control system, front passenger occupant classification system |
| 12 | H-LP RH | 10A | Right-hand headlight (high beam) |
| 13 | PWR OUTLET | 15A | Power outlet |
| 14 | DOME | 10A | Interior light, personal lights, vanity light, ignition switch light, step light, door courtesy lights, open door warning light |
| 15 | H-LP LH | 10A | Left-hand headlight (high beam) |
| 16 | EFI NO.2 | 10A | Multiport fuel injection system / sequential multiport fuel injection system, leak detection pump, emission control system |
| 17 | RADIO | 25A | Audio system |
| 18 | HEAD RL | 10A | Right-hand headlight (low beam) (with daytime running light system) |
| 19 | A/C | 10A | Air conditioning system |
| 20 | A/F | 20A | A/F sensor |
| 21 | HEAD LL | 10A | Left-hand headlight (low beam) (with daytime running light system) |
| 22 | ALT-S | 7.5A | Charging system |
| 23 | ETCS | 10A | Multiport fuel injection system / sequential multiport fuel injection system, electronic throttle control system |
| 24 | HAZ | 15A | Emergency flashers, turn signal lights, towing converter |
| 25 | EFI NO.1 | 20A | Multiport fuel injection system / sequential multiport fuel injection system, fuel pump, “EFI NO.2” fuse |
| 26 | AM2 | 30A | Ignition system, starting system, “IGN” and “STA” fuses |
| 27 | TOWING | 30A | Towing converter |
| 41 | AM1 | 40A | Starting system, “ACC”, “WIP”, “4WD”, “ECU-IG”, “GAUGE” and “TURN” fuses |
| 42 | HTR | 50A | Air conditioning system, “A/C” fuse |
| 43 | J/B | 50A | “POWER”, “CARGO LP”, “TAIL”, “OBD”, “HORN” and “STOP” fuses |
| 44 | ABS 2 | 50A | Anti-lock brake system, vehicle stability control system |
| 45 | ABS 3 | 30A | Anti-lock brake system, vehicle stability control system |
| 46 | ST3 | 30A | Starting system, “STA” fuse |
| 48 | FL ALT | 100A*1 140A*2 | “AM1”, “HTR”, “J/B”, “MIR HTR”, “FOG”, “TOW BRK”, “SUB BATT”, “TOW TAIL”, “PWR OUTLET 1” and “PWR OUTLET 2” fuses |
| 49 | A/PUMP | 60A | Multiport fuel injection system / sequential multiport fuel injection system |
| *1) without towing package *2) with towing package | |||
Instrument Panel Fuse Box
List of fuses in the instrument panel (2005)
| № | Fuse | A | Function |
|---|---|---|---|
| 28 | WIP | 20A | Windshield wipers and washer |
| 29 | TURN | 5A | Turn signal lights |
| 30 | ECU | 5A | Anti-lock brake system, vehicle stability control system, multiplex communication system, tire pressure warning system |
| 31 | 4WD | 20A | Four-wheel drive control system, A.D.D. control system |
| 32 | ACC | 15A | Cigarette lighter, audio system, power rear view mirrors, “PWR OUTLET 1” and “PWR OUTLET 2” fuses |
| 33 | GAUGE | 10A | Gauges and meters, back-up lights, starting system, air conditioning system, auto anti-glare inside rear view mirror, outside rear view mirror heaters |
| 34 | IGN | 5A | SRS airbag system, multiport fuel injection system / sequential multiport fuel injection system, discharge warning light, ignition system, vehicle stability control system, front passenger occupant classification system |
| 35 | CARGO LP | 5A | Cargo lamp |
| 36 | TAIL | 15A | Tail lights, turn signal lights, license plate lights, instrument panel lights, parking lights, glove box light |
| 37 | OBD | 7.5A | On-board diagnosis system |
| 38 | HORN | 10A | Horns |
| 39 | STA | 5A | Multiport fuel injection system / sequential multiport fuel injection system, gauges and meters |
| 40 | STOP | 15A | Stoplights, high mounted stoplight, anti-lock brake system, vehicle stability control system, towing converter |
| 47 | POWER | 30A | Power door lock system, power windows, power back window, power seat |
2006
Engine Compartment Fuse Box
List of fuses in the engine compartment (2006)
| № | Fuse | A | Function |
|---|---|---|---|
| 1 | MIR HTR | 15A | Outside rear view mirror heaters |
| 2 | FOG | 15A | Front fog lights |
| 3 | TOW BRK | 30A | Trailer brake controller (with towing package) |
| 4 | SUB BATT | 30A | Trailer sub battery (with towing package) |
| 5 | TOW TAIL | 30A | Trailer lights (tail lights) |
| 6 | SPARE | 30A | Spare fuse |
| 7 | SPARE | 15A | Spare fuse |
| 8 | SPARE | 20A | Spare fuse |
| 9 | SPARE | 10A | Spare fuse |
| 10 | PWR OUTLET 1 | 15A | Power outlets |
| 11 | ECU-B | 5A | Vehicle stability control system, front passenger occupant classification system |
| 12 | H-LP RH | 10A | Right-hand headlight (high beam) |
| 13 | PWR OUTLET | 15A | Power outlet |
| 14 | DOME | 10A | Interior light, personal lights, vanity light, ignition switch light, step light, door courtesy lights, open door warning light |
| 15 | H-LP LH | 10A | Left-hand headlight (high beam) |
| 16 | EFI NO.2 | 10A | Multiport fuel injection system / sequential multiport fuel injection system, leak detection pump, emission control system |
| 17 | RADIO | 25A | Audio system |
| 18 | HEAD RL | 10A | Right-hand headlight (low beam) (with daytime running light system) |
| 19 | A/C | 10A | Air conditioning system |
| 20 | A/F | 20A | A/F sensor |
| 21 | HEAD LL | 10A | Left-hand headlight (low beam) (with daytime running light system) |
| 22 | ALT-S | 7.5A | Charging system |
| 23 | ETCS | 10A | Multiport fuel injection system / sequential multiport fuel injection system, electronic throttle control system |
| 24 | HAZ | 15A | Emergency flashers, turn signal lights, towing converter |
| 25 | EFI NO.1 | 20A | Multiport fuel injection system / sequential multiport fuel injection system, fuel pump, “EFI NO.2” fuse |
| 26 | AM2 | 30A | Ignition system, starting system, “IGN” and “STA” fuses |
| 27 | TOWING | 30A | Towing converter |
| 41 | AM1 | 40A | Starting system, “ACC”, “WIP”, “4WD”, “ECU-IG”, “GAUGE” and “TURN” fuses |
| 42 | HTR | 50A | Air conditioning system, “A/C” fuse |
| 43 | J/B | 50A | “POWER”, “CARGO LP”, “TAIL”, “OBD”, “HORN” and “STOP” fuses |
| 44 | ABS 2 | 50A | Anti-lock brake system, vehicle stability control system |
| 45 | ABS 3 | 30A | Anti-lock brake system, vehicle stability control system |
| 46 | ST3 | 30A | Starting system, “STA” fuse |
| 48 | FL ALT | 120A*1 140A*2 | “AM1”, “HTR”, “J/B”, “MIR HTR”, “FOG”, “TOW BRK”, “SUB BATT”, “TOW TAIL”, “PWR OUTLET 1” and “PWR OUTLET 2” fuses |
| 49 | A/PUMP | 60A | Multiport fuel injection system / sequential multiport fuel injection system |
| *1) without towing package *2) with towing package | |||
Instrument Panel Fuse Box
List of fuses in the instrument panel (2006)
| № | Fuse | A | Function |
|---|---|---|---|
| 28 | WIP | 20A | Windshield wipers and washer |
| 29 | TURN | 5A | Turn signal lights |
| 30 | ECU IG | 5A | Anti-lock brake system, vehicle stability control system, multiplex communication system, tire pressure warning system |
| 31 | 4WD | 20A | Four-wheel drive control system, A.D.D. control system |
| 32 | ACC | 15A | Cigarette lighter, audio system, power rear view mirrors, “PWR OUTLET 1” and “PWR OUTLET 2” fuses |
| 33 | GAUGE | 10A | Gauges and meters, back-up lights, starting system, air conditioning system, auto anti-glare inside rear view mirror, outside rear view mirror heaters |
| 34 | IGN | 5A*1 7.5A*2 | SRS airbag system, multiport fuel injection system / sequential multiport fuel injection system, discharge warning light, ignition system, vehicle stability control system, front passenger occupant classification system, engine immobilizer system |
| 35 | CARGO LP | 5A | Cargo lamp |
| 36 | TAIL | 15A | Tail lights, turn signal lights, license plate lights, instrument panel lights, parking lights, glove box light |
| 37 | OBD | 7.5A | On-board diagnosis system |
| 38 | HORN | 10A | Horns |
| 39 | STA | 5A | Multiport fuel injection system / sequential multiport fuel injection system, gauges and meters |
| 40 | STOP | 15A | Stoplights, high mounted stoplight, anti-lock brake system, vehicle stability control system, towing converter |
| 47 | POWER | 30A | Power door lock system, power windows, power back window, power seat |
| *1) without daytime running light system *2) with daytime running light system | |||
Conclusion
The main fuse box locations on the 2003–2006 Toyota Tundra Standard and Access Cab are beneath the driver-side dashboard and in the engine compartment near the battery. The under-hood area also contains most accessible relays, sometimes in a separate nearby relay block.
Use the correct fuse and relay diagram for your truck, and handle covers and components carefully. If you cannot identify a component or a fuse keeps blowing, consult a qualified technician.
