The 2012 Honda Civic has two fuse boxes: one in the engine compartment under the hood and one inside the cabin on the driver’s side. This article explains where to find them, how to access them, and what they typically power.
Fuse box locations
Engine compartment fuse box
The engine compartment fuse box is located in the engine bay on the driver’s side, near the strut tower. It’s covered by a black plastic lid labeled “FUSE/RELAY BOX.” To access it, release the clips and lift the lid; the underside of the lid includes a diagram showing fuse numbers and their functions.
Interior cabin fuse box
The interior fuse box is inside the vehicle on the driver’s side, under the dash near the knee area. Remove the plastic cover to access the fuses; the cover also includes a diagram mapping each fuse to its function. Depending on trim, the exact location can vary slightly, so consult the owner’s manual if you have trouble locating it.
Common fuse mappings
Below are the typical circuits protected by each box. Keep in mind that exact fuse assignments can vary by trim and market, so always refer to the diagram on the box lid for your specific car.
- Engine compartment fuse box: Fuses for major systems such as the ECU/PCM, ignition, fuel pump, engine sensors, cooling fans, headlights, horn, ABS, and other high-current circuits.
- Interior cabin fuse box: Fuses for the instrumentation cluster, HVAC controls, power windows and door locks, audio system, interior lighting, and 12V auxiliary outlets.
For precise positions and amperage ratings, always check the diagram on the fuse box cover or your owner’s manual. Some configurations can differ by year or region.
Safety and replacement steps
Before handling fuses, follow these safety steps to avoid electrical shocks or shorts. Use the correct amperage and ensure the car is off.
- Turn off the ignition and remove the key; for certain replacements, disconnect the negative battery cable to reduce risk of shock or short.
- Use the correct fuse type (blade fuses) and the amperage rating shown on the fuse box diagram; replacing with a higher rating can cause wiring damage.
- If a fuse blows repeatedly, do not replace it with a higher-rated fuse—investigate the underlying cause (shorts, overload, or faulty components) or seek professional help.
- Keep a small assortment of spare fuses of the correct ratings in the vehicle for emergencies.
If you’re unsure or the fuse issue persists, consult the owner’s manual or a certified mechanic to avoid damage or safety risks.
Summary
The 2012 Honda Civic houses two main fuse boxes: an engine compartment box on the driver’s side and an interior cabin box under the dash on the driver’s side. Access is straightforward via the respective covers, which include diagrams mapping circuits to fuses. Always use the correct fuse ratings and refer to the manual for exact mappings, as configurations can vary by trim and market.