2025 Toyota Tundra: Fuse Box Diagram & Amperage
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
Working on this 2025 Toyota Tundra? Run just this one job through Repairius.
No big switch. Write the estimate, text it for approval, and get paid on your phone. Keep everything else the way it is.
14-day free trial · credit card required · cancel anytime
Quick answer
The 2025 Toyota Tundra has two primary fuse box locations:
- Under-Hood Fuse & Relay Box: Located in the engine compartment on the driver's side.
- Driver's Side Instrument Panel Fuse Box: Located in the cabin, on the driver's side, accessible by removing a trim panel on the lower part of the dashboard.
There is no fuse box in the trunk or cargo area of this vehicle.
Note: Always verify the fuse locations and ratings with the diagram printed on the inside of your vehicle's fuse box cover. Variations can exist based on trim level and optional equipment.
Under-Hood Fuse & Relay Box (Engine Compartment)
This is the main fuse box, housing high-amperage fuses and critical system relays. You'll find it on the driver’s side of the engine bay, covered by a black plastic lid. To open it, release the locking tabs and lift the cover straight up.
Main Fuses & Relays
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 50A | Red | FAN MAIN - Main Blower Motor Relay |
| 2 | 30A | Pink | ABS MTR - ABS Motor |
| 3 | 50A | Red | ABS SOL - ABS Solenoid |
| 4 | 30A | Pink | HTR - Heater System |
| 12 | 30A | Pink | STA NO. 1 - Starter Motor |
| 15 | 30A | Pink | TOWING BRAKE - Trailer Brake Control Module |
| 21 | 20A | Blue | HORN - Horn Relay |
| 22 | 10A | Red | EFI NO.2 - Fuel System, ECM |
| 25 | 10A | Red | A/C MG - A/C Compressor Clutch Relay |
| 32 | 10A | Red | HEAD LH HI - Left Headlight (High Beam) |
| 33 | 10A | Red | HEAD RH HI - Right Headlight (High Beam) |
| 34 | 15A | Blue | HEAD LH LO - Left Headlight (Low Beam) |
| 35 | 15A | Blue | HEAD RH LO - Right Headlight (Low Beam) |
| 40 | 25A | Clear | EFI MAIN - Main Fuel Injection System, Fuel Pump |
| 41 | 30A | Pink | IG MAIN - Main Ignition System |
| 43 | 30A | Pink | Blower - Main Blower Motor Relay |
| 50 | 10A | Red | ETCS - Electronic Throttle Control System |
| 52 | 10A | Red | ALT-S - Alternator Charging System |
Relay Locations: You will also find critical relays in this box, including the STARTER, EFI MAIN, A/C MG CLUTCH, and HORN relays. The diagram on the fuse box lid will map out their specific positions.
Driver's Side Instrument Panel Fuse Box (Cabin)
This fuse box contains fuses for most of the interior electronics and controls. It is located behind a removable trim panel on the lower left side of the dashboard, near the parking brake pedal. You may need to kneel down to see it clearly. The fuse puller tool is often clipped to the inside of this panel.
Interior Fuses
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 5 | 10A | Red | SRS-ACC - Airbag System, Occupant Classification |
| 6 | 10A | Red | ECU-IG1 NO. 1 - ECM, Shift Lock ECU, Gauges |
| 7 | 15A | Blue | STOP - Stop Lights, Brake Light Switch, ABS |
| 9 | 10A | Red | TAIL - Tail Lights, Parking Lights, License Plate Lights |
| 12 | 15A | Blue | RADIO - Audio System, Infotainment Screen |
| 14 | 7.5A | Brown | OBD - On-Board Diagnostics Port |
| 18 | 20A | Blue | S-HTR LH - Driver's Seat Heater |
| 19 | 20A | Blue | S-HTR RH - Passenger's Seat Heater |
| 22 | 15A | Blue | CIG - Cigar Lighter Socket |
| 23 | 15A | Blue | PWR OUTLET - 12V DC Power Outlets |
| 28 | 7.5A | Brown | METER - Combination Meter, Gauges |
| 30 | 10A | Red | IG1 - Main Ignition System Feed |
| 32 | 10A | Red | ECU-ACC - Smart Key System, Radio |
| 35 | 7.5A | Brown | PANEL - Instrument Panel Illumination |
How to test a fuse
A fuse is a simple safety device designed to be the weak link in an electrical circuit. When excess current flows, a thin metal strip inside the fuse melts and breaks the circuit, protecting more expensive components from damage.
- Turn Off the Vehicle: Ensure the ignition is in the "OFF" position.
- Locate and Remove the Fuse: Find the correct fuse box and use the diagram on the lid to identify the suspect fuse. Use the small plastic fuse puller (often located in the fuse box itself) to gently pull the fuse straight out of its slot.
- Visual Inspection: Hold the fuse up to the light. Look at the thin metal strip running between the two metal blades. If the strip is broken or melted, the fuse is blown and must be replaced.
- Confirm with a Multimeter (Recommended): For a definitive test, set a digital multimeter to the continuity setting (it often looks like a sound wave symbol). Touch one probe to each metal blade on the fuse. If the multimeter beeps or reads close to zero ohms, the fuse is good. If it remains silent or reads "OL" (Open Line), the fuse is blown.
- Replace the Fuse: Always replace a blown fuse with a new one of the exact same amperage rating. Using a higher-rated fuse can lead to a fire. The amp rating is printed on the top of the fuse.
Common blown fuses on the 2025 Toyota Tundra
While any fuse can blow, some are more common than others due to the nature of the circuits they protect.
-
Fuse: CIG (15A) or PWR OUTLET (15A)
- Symptom: Your 12V cigar lighter or power outlet stops working.
- What to Check First: These fuses often blow due to faulty phone chargers, loose plugs, or a foreign object (like a coin) falling into the socket. Unplug any devices, visually inspect the inside of the socket for debris, and then replace the fuse.
-
Fuse: TOWING BRAKE (30A) or related trailer fuses
- Symptom: The integrated trailer brake controller shows an error, or your trailer lights/brakes don't work.
- What to Check First: The most common cause is a wiring short in the trailer itself. Inspect the trailer-side wiring harness and the 7-pin plug for corrosion, frayed wires, or damage. A faulty brake controller on the trailer can also be the culprit.
-
Fuse: HEAD LH/RH LO (15A)
- Symptom: One of your low-beam headlights is out.
- What to Check First: While the first suspect is always the bulb itself, if replacing the bulb doesn't work, check the fuse. If the fuse is blown, it could indicate a wiring issue. If a new fuse blows immediately upon turning on the lights, you have a short circuit that requires professional diagnosis.
If a fuse blows repeatedly, do not install a higher-amperage fuse. This indicates an underlying electrical problem that needs to be properly diagnosed and repaired.
Find a trusted shop on Repairius.
Before you pull a fuse on the 2025 Toyota Tundra
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work
More specs for the 2025 Toyota Tundra
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2025 Toyota Tundra Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
Browse by make
Running an auto or diesel repair shop?
Compare Repairius to the shop software you're paying for
$99.99/month (first location included), unlimited users, 14-day free trial.