2021 Honda Odyssey: Fuse Box Diagram & Amperage
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
Working on this 2021 Honda Odyssey? Run just this one job through Repairius.
No big switch. Write the estimate, text it for approval, and get paid on your phone. Keep everything else the way it is.
14-day free trial · credit card required · cancel anytime
Quick answer
Your 2021 Honda Odyssey has three main fuse box locations:
- Under-hood fuse box: Located in the engine bay, near the battery on the driver's side.
- Driver's side interior fuse box: Found under the dashboard, to the left of the steering column.
- Passenger's side interior fuse box: Located behind a trim panel in the passenger's footwell, near the door hinges.
Always consult the fuse box lid or your owner's manual for the most accurate diagram, as fuse assignments can vary based on your Odyssey's trim level and options.
Under-Hood Fuse Box
The primary fuse and relay box is located in the engine compartment. It houses the high-amperage fuses that protect critical engine and chassis systems.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 120A | - | Main Fuse (Battery) |
| 2 | 60A | - | Ignition Main |
| 3 | 40A | - | EPS (Electric Power Steering) |
| 4 | 40A | - | Blower Motor |
| 5 | 30A | - | ABS/VSA Motor |
| 6 | 30A | - | Main Fan Motor |
| 7 | 20A | Blue | FI Main (Fuel Injection) |
| 9 | 15A | Blue | Stop Lights (Brake Lights) |
| 10 | 10A | Red | Right Headlight (Low Beam) |
| 11 | 10A | Red | Left Headlight (Low Beam) |
| 12 | 20A | Yellow | DBW (Drive-by-Wire) |
| 14 | 15A | Blue | Horn |
| 15 | 10A | Red | PGM-FI (ECM/PCM) |
| 16 | 15A | Blue | A/C Clutch |
| 18 | 10A | Red | Right Headlight (High Beam) |
| 19 | 10A | Red | Left Headlight (High Beam) |
| 22 | 15A | Blue | Fuel Pump |
| 23 | 7.5A | Brown | Small Light (Parking/Tail Lights) |
| 24 | 20A | Yellow | Washer Motor |
Relay Locations (Under-Hood):
- R1: A/C Clutch Relay
- R2: Fan HI Relay
- R3: PGM-FI Main Relay
- R4: Starter Relay
- R5: Throttle Control Relay
- R6: Headlight High Beam Relay
Driver's Side Interior Fuse Box
This fuse box is located under the driver's side of the dashboard, often requiring you to look up from the floor mat area. It handles many of the interior and body control functions.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 7.5A | Brown | Interior Lights |
| 5 | 10A | Red | SRS (Airbag System) |
| 10 | 7.5A | Brown | Power Mirror |
| 12 | 20A | Yellow | ACC Socket (12V Power Outlet - Console) |
| 14 | 10A | Red | Meter (Instrument Cluster) |
| 25 | 10A | Red | Ignition |
| 28 | 20A | Yellow | Power Seat (Driver) |
| 29 | 30A | Green | Power Window Motor (Driver) |
| 35 | 7.5A | Brown | ACC (Accessory) |
| 36 | 10A | Red | Audio / Radio |
| 37 | 7.5A | Brown | ODS (Occupant Detection System) |
Passenger's Side Interior Fuse Box
This fuse box is tucked away in the passenger footwell.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 4 | 20A | Yellow | ACC Socket (12V Power Outlet - Rear) |
| 11 | 15A | Blue | Fuel Pump |
| 13 | 10A | Red | Daytime Running Lights |
| 19 | 7.5A | Brown | Small Lights |
| 21 | 20A | Yellow | Power Seat (Passenger) |
How to test a fuse
A blown fuse is a common and relatively simple problem to fix. Here's how to test one:
- Turn off the ignition and all electrical components.
- Locate the suspect fuse box and remove the cover.
- Identify the fuse in question using the diagram on the fuse box lid or in your owner's manual.
- Remove the fuse. A small plastic fuse puller is often included in the fuse box. If not, small needle-nose pliers will work.
- Visually inspect the fuse. A good fuse has an intact, unbroken metal wire running through its center. A blown fuse will have a broken or melted wire.
- Confirm with a multimeter (optional but recommended). Set your multimeter to the continuity setting (it often looks like a sound wave symbol). Touch a probe to each metal blade on the top of the fuse. If the meter beeps or shows a reading of zero, the fuse is good. If it remains silent or reads "OL" (overload), the fuse is blown and has no continuity.
If you find a blown fuse, replace it with a new one of the exact same amperage rating. Never use a higher-rated fuse, as this can cause a fire.
Common blown fuses on this vehicle
- ACC Socket / Cigar Lighter (Fuse #12 - Driver's Interior): This is one of the most common fuses to blow. It's usually caused by a faulty phone charger, a coin falling into the socket, or a device that draws too much power. Before replacing the fuse, inspect the 12V socket for any foreign objects.
- Blower Motor (Fuse #4 - Under-Hood): If your climate control fan stops working on all speeds, this fuse is the first thing to check. If it blows repeatedly, it could indicate a failing blower motor or a blockage in the fan cage.
- Fuel Pump (Fuse #22 - Under-Hood or #11 - Passenger's Interior): A blown fuel pump fuse will prevent the engine from starting. While a random failure can occur, a repeatedly blowing fuse may signal a problem with the fuel pump itself, which may be failing and drawing too much current.
If a fuse blows immediately after you replace it, you have a short circuit in that component's wiring. It's time to trace the wiring or seek professional help.
Find a trusted shop on Repairius.
Before you pull a fuse on the 2021 Honda Odyssey
- 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 2021 Honda Odyssey
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
2021 Honda Odyssey Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
Browse by make
Running an auto or diesel repair shop?
Compare Repairius to the shop software you're paying for
$99.99/month (first location included), unlimited users, 14-day free trial.