2015 Toyota Tundra – Fuse Box Diagram & Amperage

Quick Answer

The 2015 Toyota Tundra features three main fuse box locations:

• Engine Compartment Fuse Box: Located under the hood, near the battery.
• Driver's Side Instrument Panel Fuse Box: Located behind a panel on the driver's side, typically near the kick panel.
• Passenger's Side Instrument Panel Fuse Box: Located behind a panel on the passenger's side, typically near the kick panel.

Engine Compartment Fuse Box

This fuse box, often referred to as the "MAIN" fuse box, houses fuses for high-current circuits and critical vehicle systems. It also contains many of the vehicle's relays.

Location: Under the hood, typically on the driver's side, close to the battery. You'll need to unclip the lid to access the fuses and relays.

Relay Locations (Under-hood):

Common relays found in the engine compartment fuse box include (but are not limited to):

• EFI Relay: Controls power to the fuel injection system.
• IGN Relay: Powers various ignition-related components.
• STARTER Relay: Engages the starter motor.
• H-LP (Headlight) Relays: Control power to the headlights.
• A/C MG CLT Relay: Controls the A/C magnetic clutch.
• FAN Relay: Controls the cooling fan.
• HORN Relay: Controls the horn.

(Note: Relay locations can vary slightly between trim levels. Always refer to the diagram on the fuse box cover for the exact layout.)

Driver's Side Instrument Panel Fuse Box

This fuse box contains fuses for various interior electrical components and accessories.

Location: Behind a small access panel on the driver's side of the dashboard, usually near the kick panel area. You might need a trim removal tool or a small flathead screwdriver to gently pry open the cover.

Passenger's Side Instrument Panel Fuse Box

Some 2015 Toyota Tundra models may feature a secondary interior fuse box on the passenger side, typically for additional accessories or specific trim level features. This is less common but worth checking if you can't find a fuse on the driver's side.

Location: Behind an access panel on the passenger's side of the dashboard, often near the kick panel or glove box area.

(Note: This fuse box may not be present on all Tundra models. Always check your owner's manual and the vehicle itself. Fuse configurations can vary based on trim level and optional equipment. Refer to the fuse legend on the fuse box cover for precise details.)

How to Test a Fuse

1. Safety First: Ensure the ignition is off before working with fuses.
2. Locate the Blown Fuse: Visually inspect the fuse. A blown fuse will have a broken wire or melted metal inside. Many fuse boxes come with a fuse puller tool.
3. Use a Multimeter: For less obvious breaks, use a multimeter set to continuity mode (looks like a speaker icon). Touch the probes to the two small metal test points on top of the fuse. A good fuse will show continuity (the multimeter will beep or show a reading of 0 ohms). A blown fuse will show no continuity ("OL" or no beep).
4. Replace with Correct Amperage: Always replace a blown fuse with a new one of the exact same amperage (A) rating and type. Using a fuse with a higher amperage can lead to electrical system damage or fire.

Common Blown Fuses on This Vehicle

While any fuse can blow, some are more commonly encountered due to frequent use or potential overload:

• CIG/PWR OUTLET Fuses: Frequently blow due to overloaded accessories plugged into the cigarette lighter or 12V outlets. Always check these first if your phone charger or other accessories stop working.
• Radio/AMP Fuses: Can blow if aftermarket audio equipment is installed incorrectly or if there's a short within the factory system.
• STOP Fuse: If your brake lights aren't working and your bulbs are good, this fuse is a common culprit. A faulty brake light switch can also cause this fuse to blow.
• BLOWER Motor Fuse/HEATER Fuse (Under-hood): If your HVAC fan stops working on all speeds, this high-amperage fuse is a prime suspect. Issues with the blower motor or resistor can cause it to blow.
• Headlight Fuses (H-LP LH/RH, H-LP HI LH/RH): If one or both headlights suddenly stop working, check these fuses after verifying the bulbs are good. A short in the headlight circuit can lead to a blown fuse.

What to check first: Before replacing any fuse, try to determine why it blew. A fuse protects a circuit from overcurrent. If you simply replace a fuse without addressing the underlying issue (e.g., a short circuit, an overloaded accessory), the new fuse will likely blow again almost immediately. Always inspect the associated component and wiring for obvious damage.

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