2020 Honda Civic Fuse Box Diagram & Amperage

Quick answer

The 2020 Honda Civic has two main fuse boxes to protect its electrical systems:

• Under-hood Fuse/Relay Box: Located in the engine bay on the driver's side, near the battery.
• Interior Fuse/Relay Box: Located under the dashboard on the driver's side, near the kick panel.

This guide will help you locate these boxes, identify the correct fuse for a problem circuit, and understand what to do when a fuse blows.

Under-hood Fuse/Relay Box Diagram

This fuse box contains higher-amperage fuses and relays that control major systems like the engine, cooling fans, and ABS. To access it, open the hood and look for a black plastic box on the driver's side. The lid has a diagram legend to help you identify each position, which you should always use to verify your specific vehicle's configuration.

Relay Locations (Under-hood)

• R1: A/C Clutch Relay
• R2: Blower Motor Relay
• R3: Main Fan Relay
• R4: Starter Cut Relay
• R5: Horn Relay
• R6: Fuel Pump Relay
• R7: Headlight High-Beam Relay
• R8: PCM (Powertrain Control Module) Relay

Interior Fuse/Relay Box Diagram

The interior fuse box handles most of the cabin electronics and convenience features. It's located under the steering column, behind a small removable panel. You may need to kneel outside the driver's door and look up under the dash to see it clearly. The fuse box lid or a label nearby will have a diagram.

Note: Fuse numbers and protected circuits can vary slightly based on your vehicle's trim level (LX, Sport, EX, Si, etc.). Always confirm with the diagram printed on your fuse box cover before replacing a fuse.

How to test a fuse

Testing a fuse is a straightforward process.

1. Safety First: Turn off the ignition and all electrical accessories.
2. Locate and Remove: Find the suspect fuse using the diagrams above and pull it straight out. A small fuse puller tool is often included in the under-hood fuse box lid.
3. Visual Inspection: Hold the fuse up to the light. Inside the plastic body is a small metal link. If that link is broken or looks burnt, the fuse is blown and needs to be replaced.
4. Multimeter Test (Optional): For a more definitive test, set a multimeter to the continuity setting (often looks like a sound wave symbol). Touch the probes to each of the two metal prongs on top of the fuse. If the multimeter beeps, the fuse is good. If it remains silent, the fuse is blown.

When replacing a fuse, always use a new fuse with the exact same amperage rating. Using a higher-rated fuse can cause overheating and create a fire hazard.

Common blown fuses on this vehicle

• Fuse #17 (Interior): Accessory Power Socket / Cigar Lighter (15A): This is one of the most common fuses to blow. It's often caused by a faulty phone charger, a coin falling into the socket, or an overloaded device. Before replacing the fuse, unplug everything from the power outlets and inspect the socket for any foreign objects.

• Fuse #18 (Interior): Audio System / Radio (15A): If your radio or infotainment screen suddenly goes black, this fuse is the first thing to check. It can sometimes blow during the installation of an aftermarket stereo or if there's an internal short in the head unit.

• Fuse #18 (Under-hood): Blower Motor (30A): If your climate control fan stops working on all speeds, check this fuse. A blown fuse here could indicate a failing blower motor or a resistor that is drawing too much current. If the new fuse blows again quickly, the motor itself likely needs inspection.

If you've replaced a fuse and it keeps blowing, you have an underlying short circuit that needs professional diagnosis. Don't risk damaging your vehicle's sensitive electronics. Find a trusted shop on Repairius to get the job done right.