2019 Toyota Tundra Fuse Box Diagram & Amperage

Quick answer

The 2019 Toyota Tundra features multiple fuse boxes located in three primary areas: under the hood (engine compartment), under the dashboard (driver's side kick panel), and behind the rear seat (passenger side).

Under-Hood Fuse Box (Engine Compartment)

This fuse box, located in the engine bay near the battery, houses fuses and relays for critical engine components, lighting, and other high-current systems. Always disconnect the negative battery terminal before attempting any electrical work.

Relays: The under-hood fuse box also contains several important relays, including the EFI Main Relay, Fuel Pump Relay, Headlight Relays (High and Low Beam), Starter Relay, A/C Clutch Relay, and Cooling Fan Relays. Refer to the fuse box lid diagram for precise relay locations.

Under-Dash Fuse Box (Driver's Side Kick Panel)

Located on the driver's side, accessible by removing a panel near the kick panel, this fuse box handles various interior electrical components, accessories, and crucial control modules.

Note: Specific fuse locations and amperages may vary slightly depending on the Tundra's trim level and optional equipment. Always consult the diagram on the fuse box cover for the most accurate information for your vehicle.

Behind Rear Seat Fuse Box (Passenger Side)

On some 2019 Tundra models, an additional fuse box can be found behind the rear passenger seat. This box often contains fuses for less frequently accessed systems or specific optional equipment, such as premium audio systems, power windows for the rear, or accessories related to the bed.

Note: Accessing this fuse box typically requires folding down or removing the rear passenger seat. Consult your owner's manual for specific instructions.

How to Test a Fuse

Testing a fuse is a straightforward process and only requires a few basic tools:

1. Safety First: Always turn off the ignition and remove the key. If working on under-hood fuses, disconnect the negative battery terminal.
2. Locate the Fuse: Identify the suspect fuse using the diagrams above and the legend on the fuse box lid.
3. Visual Inspection: Many fuses have a visible wire inside. If this wire is broken or melted, the fuse is blown and needs replacement.
4. Use a Test Light or Multimeter:
   • Test Light: Touch one end of the test light to a ground point (a metal surface on the car's chassis). Then, touch the probe of the test light to the two small metal test points on the top of the fuse. If the light illuminates on both sides, the fuse is good. If it only illuminates on one side (or not at all), the fuse is blown.
   • Multimeter: Set your multimeter to the continuity or ohms setting. Remove the fuse from its slot. Touch the two probes of the multimeter to the metal prongs of the fuse. A good fuse will show very low resistance (close to 0 ohms) or indicate continuity (often with a beep). A blown fuse will show infinite resistance or no continuity.
5. Replace with Correct Amperage: If a fuse is blown, replace it with a new one of the exact same amperage rating and type. Using a fuse with a higher amperage can lead to serious electrical damage or fire.

Common Blown Fuses on this Vehicle

While any fuse can blow, certain circuits are more prone to issues due to their high usage or connection to accessories. If you experience an electrical problem, consider checking these commonly blown fuses first:

• CIG / P/OUTLET (15A): Often blow if you or a passenger frequently use high-power accessories (like phone chargers, portable air compressors, or even older, damaged cigarette lighters) that draw more current than the circuit is designed for. Check the accessory you've plugged in before replacing the fuse.
• RADIO (15A): Can blow due to aftermarket radio installations, short circuits within the radio unit, or issues with connected devices.
• TAIL / STOP (10A / 15A): These fuses are often subject to wear and tear due to constant use of lights. Issues with trailer wiring can also cause these to blow frequently.
• HEATER (50A) / WIPER (20A): High-demand components like the blower motor or windshield wipers can sometimes draw excessive current if they are failing, seizing, or if debris obstructs their operation. If these fuses blow repeatedly, investigate the component itself.

Always remember to check the fuse box legend for the most precise fuse identification for your specific 2019 Toyota Tundra trim and configuration.

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