Which Fuse Is for the Radio in a Car? How to Find & Replace It

Which fuse is for the radio in a car depends on the make, model and year, so no single fuse number or amp rating works for every vehicle. Your owner’s manual fuse chart, or the diagram on the fuse box lid, names the right one. This guide shows how to read that chart, what real manuals list for a 2014 Ford Fusion Hybrid, a 2021 Mazda3, a 2019 Chevrolet Cruze and a Volvo XC90, and how to replace a blown fuse with the same rating.

Why Your Car Radio Needs a Fuse

A fuse is the weak link in a circuit on purpose: if too much current flows, it opens first and cuts the power. Chevrolet’s manual says fuses and circuit breakers greatly reduce the chance of circuit overload and fire caused by electrical problems.

The rating matters. Ford warns that a fuse with a higher amp rating than specified can cause severe wire damage and could start a fire, and Chevrolet says an oversized fuse can result in a vehicle fire. Everything below follows one rule: find the right fuse, and replace it with the same rating.

Common Fuse Box Locations: Finding the Guarded Gateway

Most cars carry more than one fuse box. The manuals read for this guide put the audio fuses in different places:

Vehicle (as named in the manual)	Where the manual puts the audio fuses
2014 Ford Fusion Hybrid and Fusion Energi	Passenger compartment fuse panel, under the instrument panel to the left of the steering column (a power distribution box under the hood holds the high-current fuses)
2021 Mazda3	A left-side fuse block and the engine compartment fuse block both list Audio fuses
2019 Chevrolet Cruze	Instrument panel fuse block in the center of the console, under the climate controls, behind a cover you pull off from the top
Volvo XC90 (Volvo support article, model year not stated)	Fuse box underneath the glove compartment; pull the floor mat back and unclip the lid

1. Under the Dashboard

Honda-hosted owner’s manual excerpts place the interior fuse box under the dashboard on the driver’s side or the driver’s lower left side, depending on the model.

2. Under the Hood

The engine compartment box holds the larger fuses, but some cars put audio fuses there too: the Mazda3 chart lists two Audio fuses in its engine compartment block. Ford’s 2014 Fusion manual describes its engine bay power distribution box as the one holding high-current fuses.

3. Other Possible Locations

Honda excerpts describe a secondary under-hood box next to the battery on some models. The lid diagram and the manual’s fuse chart tell you which box to open. For model-specific layouts on this site, see our 2001 Ford F-150 fuse box diagram, 2012 Ford Fiesta fuse box diagram and 2009 BMW 328i fuse box diagram.

How to Identify the Radio Fuse: Decoding the Legend

Honda’s manual puts the order plainly: if something electrical stops working, check for a blown fuse first, work out from the chart or the lid diagram which fuse controls that device, check those first, and then check all the fuses before deciding a blown fuse is not the cause. The same idea applies to every car.

Consulting Your Owner’s Manual

Open the fuse or electrical chapter for your exact year and model. Some makers publish the full chart online, such as Ford’s 2014 Fusion Hybrid and Fusion Energi fuse chart, Mazda’s 2021 Mazda3 fuse panel description and Volvo’s XC90 fuse table. Make sure the page matches your model year, because a chart for one year can differ from the next.

Reading the Fuse Box Diagram

The lid diagram and the manual list each fuse by position number or letter with an amp rating and a short description. Positions marked as not used or spare are empty slots. Chevrolet cautions that a vehicle may not be equipped with all the fuses, relays and features shown, so a listed fuse can be missing from your box.

Common Labels for the Radio Fuse

The label is rarely just “radio.” Here is what four real charts and tables show:

Vehicle	Audio-related fuses listed	Rating as printed
2014 Ford Fusion Hybrid / Fusion Energi (passenger compartment panel)	Fuse 33 Radio, Active noise control; fuse 28 Sony amplifier; fuse 5 Subwoofer amplifier; fuse 32 GPS, Voice control, Display, Adaptive cruise control, Radio frequency receiver	33: 20A; 28: 20A; 5: 20A; 32: 10A
2021 Mazda3	Engine compartment block: F46 Audio, F51 Audio. Left-side block: F13 Audio	F46: 15A; F51: 25A; F13: 15A
2019 Chevrolet Cruze (instrument panel block)	F37 Radio; F28 Amplifier; F34 Park Assist, Side blind zone alert, Infotainment, USB; F36 Display, Cluster	Not printed in the manual list; read the rating on the fuse block cover and the fuse
Volvo XC90 (under the glove compartment)	Fuse 10 Infotainment system; fuse 37 Audio control device amplifier	10: 15A Micro; 37: 40A MCase

A car can split its audio across a radio fuse, one or more amplifier fuses and a display or infotainment fuse, and ratings span 10A to 40A across these four cars, so guessing an amp rating from memory is a bad idea.

Tools You’ll Need for the Job: Simple Essentials

• The owner’s manual or lid diagram: It names the right fuse.
• A fuse puller: Honda and Mazda manuals mention a puller provided in the fuse box. If yours is missing, see our fuse puller guide and this walkthrough on removing a fuse.
• Spare fuses in the same ratings and sizes: Ford’s manual lists Micro 2, Micro 3, Maxi, Mini, M Case, J Case and J Case Low Profile as fuse types, so match both size and rating.

Step-by-Step Guide: Replacing a Blown Fuse

These steps combine the Honda, Mazda and Chevrolet manuals. Where your own manual differs, follow your manual.

1. Switch everything off: Honda says to turn the ignition to LOCK (0) and make sure the headlights and other accessories are off. Mazda says the ignition and other switches should be off.
2. Open the fuse box and find the fuse: Use the chart or lid diagram.
3. Pull the fuse straight out with the fuse puller: Mazda says to pull it straight out.
4. Inspect it: Look for a broken, burned or melted strip inside, which Honda and Chevrolet describe as the sign of a blown fuse.
5. Fit a new fuse with the identical rating and size: Mazda says to insert one of the same amperage rating and make sure it fits tightly, and to have a dealer install it if it does not. Honda says a lower-rated spare might blow again, so use the correct rating.
6. Replace the cover, then test the radio: Mazda says to reinstall the cover securely.

High-current fuses are a separate job. Ford says to always disconnect the battery before servicing high-current fuses, and notes that some features need resetting afterward; our guide to safely disconnecting a car battery covers that. Mazda says not to replace its main fuse yourself, because incorrect replacement could cause an electrical shock or a short circuit resulting in a fire.

Troubleshooting Common Fuse Issues

The New Fuse Blows Again Instantly

Honda’s manual says that if a replacement fuse of the same rating blows within a short time, there is probably a serious electrical problem; leave the blown fuse in that circuit and have the vehicle checked by a qualified technician. Do not step up to a bigger fuse. See our explainer on why car fuses keep blowing.

The Radio Still Doesn’t Work, but the Fuse Looks Good

Check every fuse the chart lists for audio, not only the one called Radio: amplifier, subwoofer amplifier, display and infotainment fuses can each be the one that failed. Honda’s advice to check all the fuses applies. Work inside the radio unit or an amplifier is a job for a repair shop.

A code prompt or a reset clock after a fuse change is expected on some cars. Honda’s manual says that if the audio fuse is removed, the audio system disables itself, asks for a five-digit code on the next start and cancels the clock setting, and a navigation system can require a PIN. Have your radio code ready before you pull the fuse. Our RDS on car radios page covers other head unit settings.

Can I Use a Higher Amp Fuse?

No. Honda says a fuse with a higher rating greatly increases the chances of damaging the electrical system, Ford says it can cause severe wire damage and could start a fire, and Chevrolet says an oversized fuse can result in a vehicle fire. Three makers, one answer: same rating only.

Fuse Amperage Explained: What Those Numbers Mean

The number stamped on a blade fuse is its amp rating. Eaton says its Bussmann blade fuses are color coded with the amp rating stamped on the front, and Littelfuse says the color coding of its ATO fuses indicates the ampere rating. Littelfuse lists ATO ratings from 1A to 40A and says the series complies with SAE J1284 and ISO 8820-3.

Eaton’s ATC family spans 1 to 40A and its ATM family 2 to 30A. Treat color as a quick visual aid and match the stamped number. See also our guide to car fuses for electrical systems.

When to Seek Professional Help

• The same-rated fuse keeps blowing: Honda says to have a qualified technician check it.
• The fuse is a high-current or main fuse: Mazda says to have a dealer replace its main fuse; Volvo recommends an authorized workshop for MCase fuses, which include the XC90 amplifier fuse.
• You see melted plastic or scorched wiring at the fuse box: Stop and have the vehicle inspected.
• The radio fuse is fine but the unit is dead: The fault may be the radio, an amplifier or wiring. See removing a car radio and the pink wire on a car stereo for aftermarket units.

The same fuse boxes also hold fuses for other systems, such as the airbag (listed as SRS in Honda charts and Air bag in the Mazda chart). Pull only the fuse you identified for the radio. This guide does not cover aftermarket radio wiring, repairs inside the radio, or high-current fuse replacement. See also whether a bad fuse can drain a car battery.

Keep reading

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• How Much Does Car Radio Installation Cost? (2025 Prices)
• Car Radio Capacitor: Keep ACC Power Longer

Frequently Asked Questions (FAQs)

How do I know if my car radio fuse is blown?

A blown blade fuse shows a broken or melted strip inside its housing. Chevrolet’s manual says to replace the fuse if that band is broken or melted, and Honda describes looking at the wire inside the large fuses. If the radio is dead and the fuse looks intact, check the other audio fuses your chart lists.

Can I use a fuse from another part of my car for the radio if it’s blown?

Only one with the identical amp rating and size. Chevrolet, Mazda and Honda manuals allow a same-rating fuse to be borrowed temporarily from a circuit you can do without, then replaced as soon as possible. Ford and Chevrolet warn that a fuse with too high a rating can start a fire.

My radio works, but the display screen is blank. Which fuse is it?

Your own chart decides. In the 2014 Ford Fusion Hybrid chart the display sits on a 10A fuse with GPS and voice control, separate from the 20A radio fuse. In the 2019 Chevrolet Cruze list, Display/Cluster is a separate entry from Radio.

What if my car doesn’t have a fuse labeled “RADIO”?

Look for Audio, Amplifier, Infotainment or Display. The Mazda3 chart uses Audio, the Volvo XC90 table uses Infotainment system and Audio control device amplifier, and the Ford chart pairs Radio with Active noise control.

Can a blown fuse affect other car functions besides the radio?

Yes, because one fuse often feeds several parts. Ford’s 2014 Fusion Hybrid chart lists GPS, voice control, display, adaptive cruise control and a radio frequency receiver on one 10A fuse, and the Chevrolet Cruze list pairs park assist, side blind zone alert, infotainment and USB on one fuse.

My radio and heater/blower stopped working at the same time. Is that one fuse?

Not necessarily. In the charts read for this guide the radio and the blower or climate control sit on separate fuses: the Cruze list shows Blower and Radio as different entries, and the Fusion chart lists Climate control and Radio on different fuses. Check both devices in your own chart, and have the problem diagnosed if they share no fuse.

Conclusion: Back to Your Beats!

The right radio fuse is whichever one your own chart lists for audio, and it can be one of several. Find the box, read the chart, pull the fuse with a puller, and fit one with the identical rating. If the new fuse blows again, get the circuit checked instead of raising the amp rating.