The 2009 Honda Accord does not use a single fuse size. It relies on multiple blade fuses of different amperages across two fuse boxes, depending on the circuit you’re protecting.
In practice, you’ll find a set of low-amperage fuses for interior electronics and a set of higher-amperage fuses and relays in the under-hood box. The exact values vary by trim and options, so the best source is the owner’s manual or the fuse diagrams printed on the fuse box covers.
Fuse box locations
Knowing where the fuses are helps when you need to check or replace them. The 2009 Accord typically has two main fuse boxes: one under the hood near the battery and one inside the cabin behind the driver's side knee panel. The fuse box lids carry a diagram listing each circuit and its fuse rating.
Under-hood fuse box
Under the hood, there are fuses and a large fuse/relay block responsible for high-demand circuits like the electrical system, cooling fans, and some accessories. The ratings range from small 10A fuses to larger 30A or 40A fuses, depending on the circuit. Always match the exact rating shown on the box cover or diagram.
Interior fuse box
The interior fuse box covers the dashboards and electronics such as the radio, power windows, A/C, and lights. Expect several 10A, 15A, and 20A fuses, plus possibly a 30A circuit for certain components. Again, rely on the label inside the cover for the correct rating for each circuit.
How to identify the correct fuse size
To identify the correct fuse size for a given circuit, you should:
Consult the owner’s manual fuse diagram or the label on the fuse box cover for the exact amperage.
Check the circuit you’re working on and replace with a fuse of the same rating. Do not increase amperage to fix a blown fuse.
All spare fuses of the same ratings are typically housed in the fuse box or in a small pouch in the glove box; replace blown fuses individually.
Using the exact fuse size ensures proper protection and avoids wiring damage or electrical fires.
Common fuse sizes by circuit (general guide)
This list provides typical values you might encounter; the actual numbers can differ by trim and market. Always verify with the diagrams on the fuse box or the owner's manual for your specific model year and trim.
10A fuses for sensors, certain dashboard lights, and power accessories with low current draw.
15A fuses for radios, sunroof controls, and some lighting circuits.
20A fuses for power windows, HVAC controls, and some instrument cluster circuits.
30A fuses for fans, power feeds to multiple components, or larger accessories.
40A and above for high-current circuits like certain relays or main distribution paths.
Remember: these are general ranges. The exact fuse amperages must be taken from the vehicle’s fuse box label or the owner's manual for your specific model year and trim.
What to do if a fuse keeps blowing
Diagnose by checking what circuit loses power, inspect for short circuits, damaged wiring, or faulty components. If a fuse continues to blow after replacing with the same rating, disconnect the suspected device and consult a professional mechanic.
Summary
The 2009 Honda Accord uses multiple fuses of varying amperages across two fuse boxes. There is no single “2009 Accord fuse size.” Check the fuse box diagrams in your car or the owner's manual for exact ratings by circuit, and replace fuses with the same rating to ensure proper protection.