2025 Honda Civic Fuse Box Diagram & Amperage

Quick answer

On the 2025 Honda Civic, there are two primary fuse box locations:

• Engine Compartment Fuse Box: Located on the driver's side of the engine bay, near the battery.
• Interior Fuse Box: Located inside the cabin, on the driver's side, tucked under the dashboard to the left of the steering column.

Always disconnect the negative battery terminal before servicing high-amperage fuses or relays.

Engine Compartment Fuse Box

This fuse box, often called the Power Distribution Center, contains high-amperage fuses and relays that control critical vehicle systems. To access it, release the clips on the black plastic cover. You'll find a diagram printed on the underside of this cover. Note that fuse and relay positions can vary slightly based on your Civic's trim level (LX, Sport, EX, Touring, Si).

Here is a list of common fuses and relays found in this location:

Relay Locations (Engine Compartment)

The same under-hood box houses critical relays. Their location is usually printed alongside the fuses on the box lid.

• R1: Starter Relay
• R2: PGM-FI Main Relay (Controls fuel pump and engine sensors)
• R3: A/C Compressor Clutch Relay
• R4: Horn Relay
• R5: Blower Motor Relay

Interior Fuse Box

This fuse panel services most of the cabin's electronics and accessories. It's located under the dashboard on the driver's side. Accessing it may require removing a small plastic trim panel. Just like the under-hood box, the panel cover or owner's manual is your primary source for the exact layout.

Important: The fuse numbers, amperage, and protected circuits listed here are for the most common configuration. Always verify with the diagram on your vehicle's fuse box lid or in your owner's manual as variations exist.

How to test a fuse

A blown fuse is an intentional weak link designed to protect a circuit from damage caused by excess current. When a fuse blows, the component it protects will stop working.

1. Safety First: Turn the vehicle's ignition off.
2. Locate and Remove: Using a fuse puller tool (often found in the fuse box itself) or a pair of needle-nose pliers, carefully pull the suspect fuse straight out from its slot.
3. Visual Inspection: Hold the fuse up to the light. Inside the plastic body, you will see a small metal strip. A good fuse will have an intact, unbroken strip. A blown fuse will have a visible gap or a dark, burnt appearance where the strip has melted.
4. Multimeter Test (Definitive): For a more accurate test, set a multimeter to the continuity setting (often indicated by a diode or sound wave symbol). Touch the probes to each of the two metal prongs on top of the fuse. If the meter beeps or reads close to zero ohms, the fuse is good. If it remains silent or shows "OL" (Open Line), the fuse is blown and has no continuity.
5. Replacement: If the fuse is blown, replace it with a new fuse of the exact same amperage rating. The amp rating is printed on top of the fuse and is color-coded for easy identification. Never use a higher-rated fuse, as this can cause a fire.

Common blown fuses on the 2025 Honda Civic

While the 2025 Civic is built with modern reliability, certain fuses are more prone to blowing due to the nature of the circuits they protect.

• Fuse #23 (Interior): Accessory Power Socket / Cigar Lighter (20A) This is by far the most common fuse to blow. It's almost always caused by the accessory plugged into the 12V outlet, not the vehicle itself.

  • What to check first: Unplug any phone chargers, dash cams, or other devices from the power outlet. Inspect the socket itself for any foreign objects, such as a coin or the metal tip of a cheap charger that has broken off. These can cause a direct short. Replace the fuse only after the socket is clear. If it blows again with nothing plugged in, the socket wiring itself may be damaged.

• Fuse #24 (Interior): Audio System (15A) If your radio or infotainment screen suddenly goes black, this fuse is the first place to look.

  • What to check first: Has any aftermarket equipment (speakers, amplifier, subwoofer) been installed recently? Improper wiring is a common cause. Occasionally, a fault in the head unit can cause this fuse to blow. If the fuse blows instantly upon replacement, there is a short circuit that needs to be diagnosed by a technician.

• Fuse #2 & #3 (Engine): Headlight Low Beam (10A) If one of your headlights is out, it's usually just a burnt-out bulb. However, it's worth checking the fuse.

  • What to check first: Replace the headlight bulb. If the new bulb doesn't work, check the fuse. If the fuse is blown, replace it. If it blows again, this indicates a problem with the wiring or a faulty ballast/headlight assembly.

Find a trusted shop on Repairius.