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Toyota Corolla Electrical Fuses Replacement Guide
How to change a blown electrical fuse or relay in a 12th generation 2020, 2021 and 2022 Toyota Corolla.

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2020 Corolla 1.8L I4
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Engine Bay Fuse Box
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Front Release Tab
This automotive maintenance tutorial was specifically written to assist owners of the twelfth generation 2019 (hatchback), 2020, 2021, 2022 (and probably also the 2023, 2024 & 2025) Toyota Corolla sedan in checking or changing a blown electrical fuse or a faulty relay in either the two engine bay electrical panels or the interior passenger compartment fuse block.

Owners of other Toyota and Lexus vehicles such as the Camry, C-HR, Venza, Avalon, 86, Sienna, Tacoma, RAV4, Highlander, 4Runner, Sequoia, IS 350, RX 350, UX 200, GS 350, IS 300 and ES 350 may also find these DIY instructions to be helpful.

This 2020 Toyota Corolla LE is equipped with low profile mini blade electrical fuses.

Please double check the fuses in your vehicle before buying new fuses.

No tools are required to access and replace any of the fuses.

If the including white plastic fuse puller tool is missing, you could use a pair of needle nose pliers (with rubber insulated handles for extra safety).

Please proceed with caution and at your own risk!

The first two steps are to open the hood and move to the right (driver) side of the engine bay.

The main or "primary" fuse and relay box is located just to the right of the 12V automotive battery and behind the driver side headlight housing and engine air filter housing.

There are three retaining clips on the fuse box cover with one at the front edge and two on the rear edge (closer to the suspension tower).

Gently push in the release tab on the front retaining clip.



 

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Rear Left Release Tab
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Rear Right Release Tab
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Pull Off Fuse Box Cover

Push in the two release tabs on the rear of the cover.

Carefully lift the cover off the top of the fuse and relay electrical panel.

There should be a white plastic fuse puller tool attached to the underside of the cover.

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Plastic Fuse Puller Tool
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Fuse Location Diagram
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2nd Engine Bay Fuse Box
There is a fuse location diagram (or "chart") located on the underside of the cover and also another diagram in your owner's manual.

Move over to the far left side of the 2ZR-FAE 1.8L I4 engine bay and locate the small rectangular fuse box.

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Right Side Release Tab
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Left Side Release Tab
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Pull Off Plastic Cover
Push in the release tabs on the left and right side of the cover before pulling it straight off.

There is a fuse and relay location chart on the underside of the cover.

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Driver Side Dashboard
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Look Above "Dead Pedal"
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Pull Off Plastic Cover
The interior passenger compartment electrical panel is located under the dashboard on the driver's side.

Look just above the "dead pedal" or "foot rest" close to where the driver's left foot would reside while driving.

The fuse block is covered by a small black plastic rectangular shaped cover.

Gently lift up the release tab on the cover located closest to you and pull off the cover.

Try to avoid using excessive force. The cover should pop off relatively easily.

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Plastic Cover Removed
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Fuse Location Diagram
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Open Jaws - Puller Tool
There is a fuse location diagram located on the outer face of the plastic cover.

Remove the fuse puller tool from the engine bay fuse box cover.

Pinch the end of the tool to open the jaws.

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Place Tool Over Fuse
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Pull Fuse Out of Socket
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Low Profile Mini Blade
Place the jaws of the tool over the old fuse that you would like to check or change.

Pull the old fuse straight out of the socket.

The OEM (original equipment manufacturer) fuses in this 2020 Corolla LE are low profile mini blade electrical fuses.

The fuses are color coded with their amperage rating. For example, the yellow fuse in the picture above is a 20A (20 amps) fuse.

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Hold Up To Light Bulb
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Push In New Fuse
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Replace Fuse Puller Tool
To check the condition of the old fuse, hold it up to a light bulb.

If the thin metal strip or "band" in the translucent plastic center of the old fuse appears to be burnt, broken or shriveled up, the old fuse is most likely "blown" and should be replaced.

If the thin metal bar in the middle of the fuse appears to be intact, the old fuse is probably still in good working condition.

Since new fuses are so inexpensive, I always recommend replacing the old fuse just in case it is blown even if the metal strip appears to be intact.

Push a new fuse of the same amperage rating (e.g. 5A, 10A, 15A, 20A) straight into the socket.

Double check that the new fuse is secure and fully seated in the socket.

Replace the white plastic fuse puller tool on the underside of the electrical box cover.

If you'd like to add a hard wired 12V power source for any automotive accessories such as a Bluetooth audio adapter, radar & laser detector, an auxiliary gauge (turbo boost or transmission temperature), a dash camera / dashcam or a GPS navigation unit, you can install an "Add-A-Circuit" Fuse Holder Tap (also known as a piggyback fuse adapter).

If you suspect that a faulty relay is the source of your electrical problem, the easiest way to troubleshoot the problem is to just simply replace the relay with a brand new one of the same amperage rating.

If you have a digital multimeter tool, you could also test the old relay.

To remove an old relay, grasp it with the needle nose pliers or standard pliers and carefully pull it straight out of its socket.

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Push On Fuse Box Cover
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Replace Small Cover
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Under Dashboard Cover
Once you are done replacing the blown fuse or faulty relay, line up the black plastic cover with the primary electrical panel.

Gently push down on the cover to secure the three retaining clips. You should feel or hear the clips "click" securely into place.

Double check that the cover is secure before moving on to the next steps.

If you removed the cover for the small fuse box at the left rear corner of the engine bay, push it down into place until the two retaining clips "click" securely into place.

If you remove the small cover for the interior passenger compartment electrical panel, line it up with the fuse block under the dashboard.

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Interior Fuse Block
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Push On Plastic Cover
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Test New Electrical Fuse
Gently push on the cover to secure it back into place.

Double check that the cover is securely attached so that it won't fall off and startle you while you are driving.

Test the electrical component that you were having problems with such as the horn, A/C system, stereo system, power windows, power door locks, tail lights, headlights, interior lights, power driver's seat, etc.

If you are still having the same electrical problem, there might be a shorted out wire or the component itself needs to be replaced.

Be sure to write down the fuse change in your vehicle's service records.

Please check out all of my 2020 Toyota Corolla DIY Repair & Maintenance Guides.
 

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