2018 Honda Civic Fuse Box Diagram
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Quick answer
Your 2018 Honda Civic has three fuse boxes:
- Under-hood fuse box: Located in the engine bay on the driver's side.
- Driver's side interior fuse box: Located under the dashboard on the driver's side.
- Passenger's side interior fuse box: Located under the dashboard on the passenger's side.
Under-hood Fuse Box Diagram
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 100A | - | Main Fuse |
| 2 | 70A | - | EPS |
| 3 | 30A | PINK | Headlight High |
| 4 | 30A | PINK | - |
| 5 | 20A | BLUE | Subfan |
| 6 | 30A | PINK | WWS |
| 7 | 40A | - | Rr DEF |
| 8 | 40A | - | Blower |
| 9 | 30A | PINK | ABS/VSA F/S |
| 10 | 30A | PINK | IGPS |
| 11 | - | - | - |
| 12 | 20A | BLUE | LAF |
| 13 | 15A | BLUE | Horn |
| 14 | 15A | BLUE | Hazard |
| 15 | 10A | RED | Oil Level Sensor |
| 16 | 15A | BLUE | Fuel Pump |
| 17 | 15A | BLUE | One Push |
| 18 | 7.5A | BROWN | MG Clutch |
| 19 | 7.5A | BROWN | FI EM |
| 20 | 15A | BLUE | VBSOL |
| 21 | 20A | BLUE | Headlight Low (R) |
| 22 | 20A | BLUE | Headlight Low (L) |
| 23 | 7.5A | BROWN | Small Light |
| 24 | 10A | RED | IGPS2 |
| 25 | 15A | BLUE | Main IG |
| 26 | 7.5A | BROWN | ECSV |
| 27 | 10A | RED | Batt DR |
| 28 | 15A | BLUE | - |
| 29 | 15A | BLUE | Stop |
| 30 | 7.5A | BROWN | DBW |
Relays:
- Fan Relay
- Headlight High Relay
-
- WWS Relay
- Rr DEF Relay
- Blower Relay
-
-
- Fuel Pump Relay
-
- MG Clutch Relay
-
- Headlight Low Relay
-
-
-
-
-
- Stop Relay
- DBW Relay
Driver's side Interior Fuse Box Diagram
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 10A | RED | SRS |
| 2 | 10A | RED | Left Headlight High Beam |
| 3 | 10A | RED | Right Headlight High Beam |
| 4 | 10A | RED | Small Lights |
| 5 | 10A | RED | Small Lights |
| 6 | 10A | RED | Dr Lock |
| 7 | 7.5A | BROWN | Meter |
| 8 | 7.5A | BROWN | ACC |
| 9 | 10A | RED | Option |
| 10 | 10A | RED | Right Headlight Low Beam |
| 11 | 10A | RED | Left Headlight Low Beam |
| 12 | 20A | YELLOW | Fr Fog |
| 13 | 10A | RED | IG1 |
| 14 | 7.5A | BROWN | ODS |
| 15 | 15A | BLUE | Rr ACC |
| 16 | 7.5A | BROWN | Fuel Lid |
| 17 | 20A | YELLOW | P/W DR |
| 18 | 20A | YELLOW | P/W AS |
| 19 | 20A | YELLOW | P/W RR |
| 20 | 20A | YELLOW | P/W RL |
| 21 | - | - | - |
| 22 | 7.5A | BROWN | Day Time Running Lights |
| 23 | 7.5A | BROWN | B-CAN |
| 24 | 15A | BLUE | Fr ACC |
| 25 | 7.5A | BROWN | ACG |
| 26 | 7.5A | BROWN | Washer |
| 27 | 7.5A | BROWN | Seat Heater |
| 28 | 15A | BLUE | Audio |
| 29 | 15A | BLUE | IG1 Rr Wiper |
| 30 | 7.5A | BROWN | Sensor |
| 31 | 7.5A | BROWN | EPB |
| 32 | 10A | RED | Door Lock |
| 33 | 7.5A | BROWN | Illumi |
| 34 | 7.5A | BROWN | VSA |
| 35 | 7.5A | BROWN | EPB |
| 36 | 10A | RED | Rr Wiper |
| 37 | - | - | - |
Passenger's side Interior Fuse Box Diagram
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 38 | 20A | YELLOW | Door Lock |
| 39 | - | - | - |
| 40 | 30A | - | Power Window |
| 41 | 30A | - | Power Window |
| 42 | 30A | - | - |
| 43 | 20A | YELLOW | Sunroof |
| 44 | - | - | - |
| 45 | 15A | BLUE | FR Wiper |
| 46 | 15A | BLUE | - |
| 47 | 10A | RED | Back Up |
| 48 | 10A | RED | - |
How to test a fuse
- Turn off the ignition and all accessories.
- Locate the fuse box.
- Remove the fuse box cover.
- Identify the suspect fuse.
- Remove the fuse. Use the fuse puller tool that comes with your vehicle. It is usually located in the interior fuse box.
- Inspect the fuse. Look for a broken filament inside the fuse. If the filament is broken, the fuse is blown and needs to be replaced.
- Replace the fuse. Use a new fuse with the same amperage rating as the old one. You can find the amperage rating on the top of the fuse.
- Reinstall the fuse box cover.
- Turn on the ignition and test the component that was not working.
Common blown fuses on this vehicle
- ACC fuse: This fuse protects the accessory power outlet. If the outlet is not working, check this fuse first.
- Audio fuse: This fuse protects the audio system. If the radio is not working, check this fuse first.
- Blower motor fuse: This fuse protects the blower motor. If the fan is not working, check this fuse first.
- Headlight fuses: There are separate fuses for the high and low beams. If one of your headlights is not working, check the appropriate fuse.
Find a trusted shop on Repairius.
Before you pull a fuse on the 2018 Honda Civic
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work
More specs for the 2018 Honda Civic
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2018 Honda Civic Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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