2021 Mazda MX-5 Miata Fuses and Fuse box | Checking and replacing fuses
The Mazda MX-5 Miata 2021 is a finely crafted roadster that seamlessly blends style and performance. The fuse box is a critical component that ensures the smooth operation of various electrical systems beneath its sleek exterior. In this guide, we’ll look at fuses in the MX-5 Miata, learn why they’re important, and how to check and replace them properly. The MX-5 Miata’s fuse box serves as a protector, shielding vital electrical components from potential damage caused by electrical surges or faults. Fuse boxes play an important role in the overall functionality of the car, from controlling the lights and power windows to managing the engine’s intricate electronic systems.
As a responsible MX-5 Miata owner, you must understand the fuse box and its contents. In this guide, we’ll go over how to check and replace fuses, giving you the knowledge and confidence to troubleshoot electrical issues effectively. Understanding the fuse box is essential for keeping your MX-5 Miata running smoothly, whether you’re dealing with a faulty accessory or a more complex electrical issue.
2023 MAZDA MX-5 MITA Specs, Price, Features, Mileage (Brochure)
Fuses
Your vehicle’s electrical system is protected by fuses.
If any lights, accessories, or controls do not work, inspect the appropriate circuit protector. If a fuse has blown, the inside element will be melted.
If the same fuse blows again, avoid using that system and consult an Authorized Mazda Dealer as soon as possible.
Fuse Replacement
Replacing the fuses on the vehicle’s left side
If the electrical system does not work, first inspect the fuses on the vehicle’s left side.
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Make sure the ignition is switched off, and other switches are off.
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Open the fuse panel cover.
- Pull the fuse straight out with the fuse puller provided on the fuse block located in the engine compartment.
- Inspect the fuse and replace it if it is blown.
- Insert a new fuse of the same amperage rating, and make sure it fits tightly. If it does not fit tightly, have an expert install it. Consult an Authorized Mazda Dealer.
If you have no spare fuses, borrow one of the same rating from a circuit not essential to vehicle operation, such as the AUDIO or OUTLET circuit.
CAUTION
Always replace a fuse with a genuine Mazda fuse or equivalent of the same rating. Otherwise you may damage the electric system. - Reinstall the cover and make sure that it is securely installed.
Replacing the fuses under the hood
If the headlights or other electrical components do not work and the fuses in the cabin are normal, inspect the fuse block under the hood.
If a fuse is blown, it must be replaced. Follow these steps:
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Make sure the ignition is switched off, and other switches are off.
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Remove the fuse block cover.
- Disengage the rear lock by pressing down on the front tab with your fingers.
- Remove the front tab while slightly lifting the front of the cover.
- Remove the cover while lifting it and sliding it to the rear.
- If any fuse but the MAIN fuse is blown, replace it with a new one of the same amperage rating.
WARNING
Do not replace the main fuse by yourself. Have an Authorized Mazda Dealer perform the replacement: Replacing the fuse by yourself is dangerous because the MAIN fuse is a high current fuse. Incorrect replacement could cause an electrical shock or a short circuit resulting in a fire. - Reinstall the cover and make sure that it is securely installed.
CAUTION
Always replace a fuse with a genuine Mazda fuse or equivalent of the same rating. Otherwise you may damage the electric system. - Reinstall the cover and make sure that it is securely installed.
Replacing the fuses under the hood
If the headlights or other electrical components do not work and the fuses in the cabin are normal, inspect the fuse block under the hood.
If a fuse is blown, it must be replaced. Follow these steps:
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Make sure the ignition is switched off, and other switches are off.
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Remove the fuse block cover.NOTEIf the lock is forcefully opened, the fuse block cover may come in contact with the frame when it is removed and become scratched.When removing the cover, remove it slowly according to the following procedure.
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Disengage the rear lock by pressing down on the front tab with your fingers.
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Remove the front tab while slightly lifting the front of the cover.
- Remove the cover while lifting it and sliding it to the rear.
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- If any fuse but the MAIN fuse is blown, replace it with a new one of the same amperage rating.
WARNING
Do not replace the main fuse by yourself. Have an Authorized Mazda Dealer perform the replacement: Replacing the fuse by yourself is dangerous because the MAIN fuse is a high current fuse. Incorrect replacement could cause an electrical shock or a short circuit resulting in a fire. - Reinstall the cover and make sure that it is securely installed.
Maintenance and Care
Owner Maintenance
Fuse Panel Description
Fuse block (Engine compartment)
| DESCRIPTION | FUSE RATING | PROTECTED COMPONENT | |
| 1 | ENG IG3 | 5 A | ― |
| 2 | ENG IG2 | 5 A | ― |
| 3 | HORN2 | 7.5 A | Horn |
| 4 | C/U IG1 | 15 A | For protection of various circuits |
| 5 | ENG IG1 | 7.5 A | Engine control system |
| 6 | ― | ― | ― |
| 7 | INTERIOR | 15 A | Overhead light |
| 8 | ENG B | 7.5 A | Engine control system |
| 9 | AUDIO2 | 15 A | Audio system |
| 10 | METER1 | 10 A | Instrument cluster |
| 11 | SRS1 | 7.5 A | Air bag |
| 12 | ― | ― | ― |
| 13 | RADIO | 7.5 A | Audio system |
| 14 | ENGINE3 | 20 A | ― |
| 15 | ENGINE1 | 10 A | Engine control system |
| 16 | ENGINE2 | 15 A | Engine control system |
| DESCRIPTION | FUSE RATING | PROTECTED COMPONENT | |
| 51 | ― | ― | ― |
| 52 | ENGINE4 | 20 A | Engine control system |
Fuse block (Left side)
| DESCRIPTION | FUSE RATING | PROTECTED COMPONENT | |
| 1 | RHT R | 30 A | Retractable hardtop (RH)* |
| 2 | RHT L | 30 A | Retractable hardtop (LH)* |
| 3 | ― | ― | ― |
| 4 | ENGINE6 | 10 A | Engine control system |
| 5 | F.OUTLET | 15 A | Accessory sockets |
| 6 | ― | ― | ― |
| 7 | AT IND | 7.5 A | AT shift indicator* |
| 8 | MIRROR | 7.5 A | Power control mirror |
| 9 | R_DECK R | 30 A | Retractable hardtop (RH)* |
| 10 | R_DECK L | 30 A | Retractable hardtop (LH)* |
| 11 | F.WASHER | 15 A | Windshield washer |
| 12 | P.WINDOW | 30 A | Power windows |
| 13 | ― | ― | ― |
| 14 | SRS2/ESCL | 15 A | Electronic steering lock |
| 15 | SEAT WARM | 20 A | Seat warmer* |
| 16 | M.DEF | 7.5 A | Mirror defogger* |
FAQs
Depending on the model and trim, the fuse box in the 2021 Mazda MX-5 Miata is typically located in the engine compartment or the interior of the vehicle. For precise location information, consult the owner’s manual.
Fuses in the MX-5 Miata serve as protective devices for electrical components, preventing damage from electrical overloads. They function as a safety mechanism to ensure the proper operation of the vehicle’s various systems.
A blown fuse is often visible, with the metal filament inside the fuse appearing broken or melted. Some fuse boxes also include a diagram that shows which fuse corresponds to which components.
You can visually inspect fuses without using any special tools. A multimeter or a fuse tester, on the other hand, can provide a more accurate assessment of a fuse’s functionality.
Consult the owner’s manual for the correct fuse rating if you suspect a blown fuse. Replace the blown fuse with one of the same rating, and seek professional assistance if the problem persists.
Most MX-5 Miatas are equipped with spare fuses. These are frequently found inside the fuse box cover or in a specific compartment within the vehicle.
Yes, a blown fuse can affect multiple systems because a single fuse may protect several related components. When troubleshooting electrical problems, it is critical to thoroughly inspect the fuse box.
No, it is not recommended to use a higher-amp fuse. To avoid damage to the electrical components it protects, always replace a blown fuse with one of the same amp rating.
While it is not always necessary, disconnecting the battery adds an extra layer of safety when working on the fuse box to avoid electrical shocks or short circuits.
Routine maintenance should include periodic checks. Furthermore, if you have electrical problems in your vehicle, one of the first steps should be to check the fuses
Yes, replacing fuses is a relatively simple do-it-yourself project. The owner’s manual includes information on the location and type of fuses, making it accessible to the majority of enthusiasts.
Common electrical problems include issues with interior lights, power windows, and audio systems. If problems arise, inspect the fuses associated with these components.
To access and replace fuses, basic tools such as a fuse puller, pliers, or a screwdriver may be required. The tools required will vary depending on the design of the fuse box.
Driving with a blown fuse is possible, but not recommended. To avoid further damage to electrical components, the underlying problem must be addressed as soon as possible.
If you are unable to identify or resolve the fuse issue, it is recommended that you consult the vehicle’s service manual or seek the assistance of a qualified automotive professional to diagnose and repair the electrical problem.
Useful Links
View Full PDF: Mazda MX-5 Miata 2021 User Manual| Auto User Guide
2023 MAZDA MX-5 MIATA Specs, Price, Features, Mileage (Brochure)
2021 Mazda MX-5 Miata Dashboard Instrument Cluster Guidelines