2018 Subaru Forester Fuse Box Diagram & Amperage
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Quick answer
Your 2018 Subaru Forester has two main fuse boxes:
- Under the hood: Located in the engine bay, on the driver's side, near the battery.
- In the cabin: Located under the dashboard, on the driver's side, to the left of the steering column.
Under-Hood Fuse Box
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 30A | PINK | Radiator Fan |
| 2 | 20A | YEL | Fuel Pump |
| 3 | 20A | YEL | Main Fan |
| 4 | 15A | BLU | Horn |
| 5 | --- | --- | Spare |
| 6 | 15A | BLU | Headlight (Left High) |
| 7 | 15A | BLU | Headlight (Right High) |
| 8 | 15A | BLU | A/C Clutch |
| 9 | 10A | RED | Front Fog Lights |
| 10 | --- | --- | Spare |
| 11 | 20A | YEL | Starter |
| 12 | 10A | RED | Back-up |
| 13 | 10A | RED | Stop |
| 14 | 20A | YEL | ABS |
| 15 | 30A | GRN | ABS |
| 16 | --- | --- | Spare |
| 17 | 10A | RED | Headlight (Right Low) |
| 18 | 10A | RED | Headlight (Left Low) |
| 19 | 15A | BLU | Ignition |
| 20 | 25A | WHT | DRL |
| 21 | 15A | BLU | IG2 |
| 22 | 15A | BLU | Fuel Injectors |
| 23 | 25A | WHT | Glass Heater |
| 24 | --- | --- | Spare |
| 25 | --- | --- | Spare |
| 26 | --- | --- | Spare |
| 27 | 7.5A | BRN | Alternator |
| 28 | 10A | RED | ECM/PCM |
| 29 | 10A | RED | ACC |
Relays:
| Relay | Circuit |
|---|---|
| R1 | Headlight |
| R2 | Main Fan |
| R3 | A/C Clutch |
| R4 | Horn |
| R5 | Starter |
| R6 | Ignition |
| R7 | Fuel Pump |
In-Cabin Fuse Box
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 10A | RED | Stop Light Switch |
| 2 | 10A | RED | Sunroof |
| 3 | 15A | BLU | Power Outlet (Console) |
| 4 | 20A | YEL | Wiper |
| 5 | 15A | BLU | Meter, Gauge |
| 6 | 7.5A | BRN | Audio |
| 7 | 15A | BLU | ACC |
| 8 | 15A | BLU | Power Outlet (Cargo) |
| 9 | 15A | BLU | Door Lock |
| 10 | 7.5A | BRN | SRS Airbag |
| 11 | 7.5A | BRN | SRS Airbag |
| 12 | 20A | YEL | Seat Heater |
| 13 | 10A | RED | IG2 |
| 14 | 15A | BLU | Power Windows |
| 15 | --- | --- | Spare |
| 16 | 7.5A | BRN | Keyless Entry |
| 17 | 10A | RED | Interior Lights |
| 18 | 10A | RED | Shifter |
| 19 | 15A | BLU | Audio, Navigation |
| 20 | 10A | RED | Power Mirror |
| 21 | 10A | RED | Tail & Parking Lights |
| 22 | 10A | RED | Hazard |
| 23 | 25A | WHT | Heated Mirrors |
| 24 | --- | --- | Spare |
| 25 | 10A | RED | Blower Motor |
| 26 | 10A | RED | Turn Signals |
| 27 | 15A | BLU | Cigar Lighter |
| 28 | 7.5A | BRN | IG1 |
| 29 | 7.5A | BRN | Seat Memory |
| 30 | 7.5A | BRN | Steering Responsive Fog Lights |
| 31 | 7.5A | BRN | Interior Illumination |
How to test a fuse
- Locate the fuse boxes. Your Forester has two: one in the engine bay and one in the cabin.
- Remove the fuse. Use the fuse puller tool (often found in the fuse box lid) to gently pull the fuse straight out.
- Inspect the fuse. Look at the metal wire inside the plastic housing. If the wire is broken, the fuse is blown and needs to be replaced.
- Test with a multimeter (optional). Set your multimeter to the continuity setting. Touch the probes to each end of the fuse. If you hear a beep, the fuse is good. If not, it's blown.
- Replace the fuse. If the fuse is blown, replace it with a new fuse of the same amperage. Using a fuse with a higher amperage can cause serious electrical damage.
Common blown fuses on this vehicle
- Cigar Lighter / Power Outlet: This is one of the most common blown fuses. It's often caused by a faulty phone charger or other device plugged into the outlet. Check the device for damage before replacing the fuse.
- Headlights: If one of your headlights is out, it could be a blown fuse. However, it's more likely that the bulb itself has burned out.
- Radio / Infotainment: If your radio or infotainment screen is on the fritz, check the fuse first. It's an easy fix that could save you a trip to the dealership.
Always verify the fuse locations and amperage ratings with the diagram printed on the inside of your fuse box lid. Trim levels and options packages can cause variations.
Find a trusted shop on Repairius.
Before you pull a fuse on the 2018 Subaru Forester
- 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 Subaru Forester
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 Subaru Forester 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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