2020 Toyota Corolla Fuse Box Diagram & Amperage Guide

Quick Answer

Your 2020 Toyota Corolla has several fuse box locations:

• Engine Compartment Fuse Box: Located under the hood, near the battery.
• Instrument Panel Fuse Box (Driver's Side): Located on the driver's side, behind a cover in the kick panel area.

Engine Compartment Fuse Box

The engine compartment fuse box primarily houses fuses and relays for critical engine functions, lights, and other high-current components. Always verify the exact layout with the diagram on your fuse box cover, as variations can occur based on trim level and options.

Relays in the Engine Compartment Fuse Box typically include:

• EFI Relay: Controls power to the EFI NO.2 fuse and other engine components.
• HORN Relay: Activates the horn.
• HEADLIGHT Relays (LH/RH): Control power to the headlights.
• A/C MAG Relay: Engages the A/C compressor clutch.
• STARTER Relay: Engages the starter motor.
• FAN Relay: Controls the cooling fan operation.

Instrument Panel Fuse Box (Driver's Side)

This fuse box manages fuses for various interior electrical components, accessories, and convenience features. It's located behind a small access panel on the driver's side dashboard, often requiring a pry tool or flathead screwdriver to open.

How to Test a Fuse

Testing a fuse is a straightforward process that can help you diagnose electrical issues. You'll need a fuse puller (usually found in the fuse box lid or toolkit) and a multimeter or a fuse test light.

1. Locate the Fuse Box: Refer to the "Quick Answer" section to find the correct fuse box.
2. Identify the Suspect Fuse: Consult the fuse diagram on the lid or in your owner's manual to pinpoint the fuse for the circuit you're troubleshooting.
3. Remove the Fuse: Use the fuse puller to carefully remove the fuse strait out. Avoid using pliers, which can damage the fuse or surrounding components.
4. Visual Inspection: Hold the fuse up to the light. If the metal wire or ribbon inside is broken or burnt, the fuse is blown and needs replacement.
5. Test with a Multimeter (Continuity Test):
   • Set your multimeter to the continuity setting (it usually looks like a speaker or diode symbol).
   • Touch one probe to each metal terminal of the fuse. If you hear a beep or the display shows a very low resistance (near 0 ohms), the fuse is good. If there's no beep or the display shows "OL" (open loop), the fuse is bad.
6. Test with a Test Light:
   • Connect the test light's alligator clip to a good ground point on the vehicle body.
   • With the ignition on (or the circuit powered), touch the probe of the test light to the small metal test points on the top of the fuse (most modern fuses have these). If both sides illuminate, the fuse is good. If only one side lights up or neither does, the fuse is blown.
7. Replace the Fuse: If the fuse is blown, replace it with a new fuse 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, some are more commonly affected due to their function or the components they protect. If you're experiencing an electrical issue, start by checking these fuses first:

• CIG/PWR OUT (Cigar Lighter/12V Power Outlets): These fuses protect the auxiliary power outlets. They frequently blow due to overcurrent from charging multiple devices or using high-power accessories. What to check first: Unplug any devices from the 12V outlets before replacing the fuse. Ensure the problem isn't a faulty charger or accessory.
• RADIO/ACC (Radio/Accessory): If your radio, infotainment screen, or other accessories aren't working, these fuses are likely culprits. What to check first: Consider if you recently installed aftermarket audio equipment or if there was a power surge.
• STOP (Brake Lights): If your brake lights aren't working, this fuse is the primary suspect. It can blow if there's a short in the brake light circuit or a faulty brake light switch. What to check first: Visually inspect your brake light bulbs for signs of damage.
• HEADLIGHT (Low/High Beam) Fuses: If one or both of your headlights are out, check these fuses. They can blow due to a bad bulb or a short in the wiring. What to check first: Ensure the headlight bulbs themselves aren't burnt out.
• WIPER (Windshield Wiper Motor): If your wipers stop working, this fuse is often the cause. It can blow if the wiper motor is overloaded (e.g., trying to clear heavy snow or ice) or if there's a mechanical obstruction. What to check first: Clear any obstructions from the wiper blades and windshield.

Remember, if a new fuse blows immediately after replacement, there's an underlying electrical problem that needs professional diagnosis. Repeatedly replacing a fuse without addressing the root cause can damage your vehicle's electrical system.

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