2014 Toyota Tundra Fuse Box Diagram

Quick Answer

On a 2014 Toyota Tundra, you will find two primary fuse box locations:

• Engine Compartment: Located on the driver's side of the engine bay, near the battery.
• Driver's Side Instrument Panel: Located under the dashboard on the driver's side, to the left of the steering column.

Engine Compartment Fuse Box

The main fuse box is located under the hood on the driver's side. It contains higher-amperage cartridge fuses and various relays that control critical vehicle functions. To access it, press the tab on the large black plastic cover and lift it off.

Note: Your Tundra's fuse layout may vary slightly based on trim level and options. Always confirm fuse locations and ratings with the diagram printed on the inside of your fuse box cover.

Main Fuses (Cartridge Style)

J-Case and Mini Fuses

Relays in Engine Compartment Box

• STARTER RELAY: Engages the starter motor.
• EFI-MAIN RELAY: Powers the electronic fuel injection system.
• HORN RELAY: Activates the horn.
• A/C MG CLT RELAY: Engages the A/C compressor clutch.
• HEAD RELAY: Controls power to the headlights.

Driver's Side Instrument Panel Fuse Box

This fuse box is located inside the cabin, under the dash to the left of the steering wheel. It primarily handles interior electronics and control systems. You may need to remove a small trim panel to access it.

How to Test a Fuse

Testing a fuse is a simple process. A "blown" fuse has a broken internal filament, interrupting the electrical circuit it was designed to protect.

1. Safety First: Turn the vehicle's ignition completely off.
2. Locate & Remove: Find the suspect fuse using the diagrams above. Use the plastic fuse puller tool, often found in the engine compartment fuse box lid, to gently pull the fuse straight out of its slot.
3. Visual Inspection: Hold the fuse up to the light. Look at the thin metal strip (filament) inside the colored plastic housing. If the strip is broken or melted, the fuse is blown and must be replaced.
4. Multimeter Test (Optional): For a more definitive test, set a multimeter to the continuity setting (often indicated by a sound icon). Touch one probe to each metal spade on the top of the fuse. If the multimeter beeps, the fuse is good. If it remains silent, the fuse is blown.

Important: Always replace a blown fuse with a new one of the exact same amperage rating. Using a higher-rated fuse can cause severe damage to the electrical system and create a fire hazard.

Common Blown Fuses on the 2014 Toyota Tundra

• CIG / POWER OUTLET Fuses (15A/20A): These are among the most common fuses to blow. The cause is often a faulty phone charger, a coin falling into the outlet, or plugging in a device that draws too much power. Before replacing the fuse, inspect the outlet for foreign objects.
• RADIO NO. 1 Fuse (20A): If your infotainment screen suddenly goes black, this fuse is the first thing to check. It can blow due to an internal fault in the radio or, less commonly, a wiring issue.
• TRAILER TOWING BRAKE Fuse (30A): If you frequently tow, issues with your trailer's wiring (corrosion, shorts) can cause this fuse to blow. If it blows repeatedly, have your trailer's wiring harness inspected for damage.

If a fuse blows immediately after you replace it, this indicates a persistent short circuit in that component or its wiring. Continuing to replace the fuse will not solve the underlying problem. In this case, further diagnosis is required.

Need help diagnosing an electrical problem? Your fuse box is the first stop, but for complex issues, professional help is recommended. Find a trusted shop in your area on Repairius.com.