2020 Mazda CX-3 Fuses and Fuse box | Replacing a blown fuse
The 2020 Mazda CX-3 comes with a comprehensive fuse system that protects various electrical components throughout the vehicle. The fuse box, a critical component of this system, is placed strategically to protect sensitive electronics from electrical overloads. In this guide, we’ll go over the 2020 Mazda CX-3 fuses and fuse box, explaining why they’re important and how to replace a blown fuse. The fuse system in the 2020 Mazda CX-3 serves as a safeguard between the vehicle’s electrical components and potential power surges. Fuses are intended to break the circuit in the event of an overload or short circuit, protecting critical electronic systems such as lights, audio components, and various other accessories.
Understanding the role of fuses and the fuse box in the 2020 Mazda CX-3 enables you to address minor electrical issues efficiently. This guide will walk you through the fundamentals of maintaining and troubleshooting your fuse system, resulting in a smoother and more reliable driving experience.
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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.
- Make sure the ignition is switched off, and other switches are off.
- 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. We recommend 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:
- Make sure the ignition is switched off, and other switches are off.
- Remove the fuse block cover.
- If any fuse but the MAIN fuse is blown, replace it with a new one of the same amperage rating.
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.
Fuse Panel Description
Fuse block (Engine compartment)
| DESCRIPTION | FUSE RATING | PROTECTED COMPONENT | ||||||
| 1 | C/U IG1 | 15 A | For protection of various circuits | |||||
| 2 | ENGINE IG1 | 7.5 A | Engine control system | |||||
| 3 | SUNROOF | 10 A | Moonroof* | |||||
| 4 | INTERIOR | 15 A | Overhead light, Audio system | |||||
| 5 | 7.5 A | Engine control system | ||||||
| 6 | AUDIO2 ENGINE4 | 15 A | Engine control system | |||||
| 7 | METER1 | 10 A | Instrument cluster | |||||
| 8 | SRS1 | 7.5 A | Air bag | |||||
| 9 | METER2 | 7.5 A | ― | |||||
| 10 | RADIO | 7.5 A | Audio system | |||||
| 11 | ENGINE3 | 15 A | Engine control system | |||||
| 12 | ENGINE1 | 15 A | ― | |||||
| 13 | ENGINE2 | 15 A | Engine control system | |||||
| 14 | AUDIO1 | 25 A | Audio system | |||||
| DESCRIPTION | FUSE RATING | PROTECTED COMPONENT | ||||||
| 15 | A/C MAG | 7.5 A | Air conditioner | |||||
| 16 | AT PUMP | 15 A | ― | |||||
| 17 | AT | 15 A | Transaxle control system | |||||
| 18 | D.LOCK | 25 A | Power door locks | |||||
| 19 | H/L RH | 20 A | Headlight (RH) | |||||
| 20 | 7.5 A | Engine control system | ||||||
| 21 | TAIL | 20 A | Taillights, License plate lights, Parking lights | |||||
| 22 | ST.HEATER | 15 A / 20 A | Heated steering wheel*, Headlight* | |||||
| 23 | ROOM | 25 A | Overhead light | |||||
| 24 | FOG | 15 A | Fog lights* | |||||
| 25 | H/CLEAN | 20 A | ― | |||||
| 26 | STOP | 10 A | Brake lights | |||||
| 27 | HORN | 15 A | Horn | |||||
| 28 | H/L LH | 20 A | Headlight (LH) | |||||
| 29 | ABS/DSC S | 30 A | ABS, Dynamic stability control system | |||||
| 30 | HAZARD | 15 A | Hazard warning flashers, Turn signal lights | |||||
| 31 | FUEL PUMP SCR | 15 A | Fuel system | |||||
| 32 | FUEL WARM | 25 A | ― | |||||
| 33 | WIPER | 20 A | Front window wiper | |||||
| 34 | 50 A | For protection of various circuits | ||||||
| 35 | FAN2 EPB L | 30 A | Electric parking brake (LH) | |||||
| 36 | FUEL PUMP | 30 A | ― | |||||
| 37 | ABS/DSC M | 50 A | ABS, Dynamic stability control system | |||||
| 38 | EVVT | 20 A | Engine control system | |||||
| 39 | ― | ― | ― | |||||
| 40 | FAN1 EPB R | 30 A | Electric parking brake (RH) | |||||
| 41 | FAN3 | 40 A | Cooling fan | |||||
| 42 | ENG.MAIN | 40 A | Engine control system | |||||
| 43 | EPS | 60 A | ― | |||||
| 44 | DEFOG | 40 A | Rear window defogger | |||||
| 45 | IG2 | 30 A | For protection of various circuits | |||||
| 46 | INJECTOR ENG.SUB | 30 A | Engine control system | |||||
| DESCRIPTION | FUSE RATING | PROTECTED COMPONENT | ||||||
| 47 | HEATER | 40 A | Air conditioner | |||||
| 48 | P.WINDOW1 | 30 A | Power windows | |||||
| 49 | DCDC DE | 40 A | ― | |||||
Fuse block (Left side
| DESCRIPTION | FUSE RATING | PROTECTED COMPONENT | ||||||
| 1 | ― | ― | ― | |||||
| 2 | ― | ― | ― | |||||
| 3 | AUDIO2 | 15 A | Audio system | |||||
| 4 | ST.HEATER | 10 A | Heated steering 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 | ― | ― | ― | |||||
| 10 | P.WINDOW2 | 25 A | Power windows | |||||
| 11 | R.WIPER | 15 A | Rear window wiper and washer | |||||
| 12 | P.SEAT D | 30 A | Power seat* | |||||
| 13 | ― | ― | ― | |||||
| 14 | SRS2/ESCL | 15 A | ― | |||||
| 15 | SEAT WARM | 20 A | Seat warmer* | |||||
| DESCRIPTION | FUSE RATING | PROTECTED COMPONENT | ||||||
| 16 | M.DEF | 7.5 A | Mirror defogger* | |||||
FAQs
How do I locate the fuse box in my 2020 Mazda CX-3?
Fuses protect electrical components by breaking the circuit in case of overload or short circuit, preventing damage to sensitive electronics.
To identify a blown fuse in your Mazda CX-3, look for a broken filament or use a multimeter to check continuity. You may also notice lights or accessories that aren’t working because of the blown fuse.
A fuse puller or a pair of needle-nose pliers is usually enough to remove and replace a blown fuse.
The fuse box cover or owner’s manual provide a diagram indicating the amperage rating for each fuse.
Use a fuse of the same amperage as the one being replaced. Using a different amperage fuse may cause electrical issues or damage.
To identify the fuse for a malfunctioning component, refer to the fuse diagram on the fuse box cover or your owner’s manual.
If you don’t have a fuse puller, you can use needle-nose pliers to gently remove a blown fuse. Use caution to avoid damaging the fuse or the surrounding components.
To ensure safety, it’s recommended to turn off the vehicle. However, if necessary, you can replace a fuse while the ignition is turned on, but use caution.
Inspect your fuses on a regular basis if you have electrical issues. Otherwise, there is usually no set maintenance schedule for fuse checks.
Begin by identifying the blown fuse, then turn off the vehicle, remove the blown fuse, replace it with a new one of the same amperage, and test the associated component.
Not always. Even if the filament appears to be intact, the fuse may still be faulty. Checking for continuity is best done with a multimeter.
: If fuses consistently blow, there could be an underlying electrical issue. Consult a professional mechanic to diagnose and resolve the issue.
Yes, they are widely available. Make sure you choose fuses with the correct amperage rating.
Fuse failures can occur for a variety of reasons. However, if it occurs frequently, it may indicate an underlying problem that requires the attention of a qualified technician.
Useful Links
View Full PDF: Mazda CX-3 2020 User Manual| Auto User Guide