The Subaru Legacy is a mid-size car featuring all-wheel capability from Japanese automaker Subaru. It comes equipped with signature horizontally opposed (boxer) engines and standard Symmetrical All-Wheel Drive across all trim levels. This guide details the fuse box diagrams and relay assignments for fifth-generation Subaru Legacy models (2009–2015) and fourth-generation Subaru Outback models (2009–2015).
Below are the locations, diagrams, and photos of the power distribution boxes. Fuses for the "Cigarette Lighter" and "Fuel Pump" are highlighted in bold.
Engine Compartment Fuse Box
Located on the left (driver) side of the engine compartment.
General overview.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Protected Component | Rating (A) |
| A | Main fuse (Gasoline models) | |
| 1 | CVT control module | 7.5 |
| 2 | Horn (Right side) | 7.5 |
| 3 | Horn (Center) | 7.5 |
| 4 | Low beam headlight (Right side) | 15 |
| 5 | Low beam headlight (Left side) | 15 |
| 6 | Fuel pump (Subaru Legacy) | 20 |
| 7 | High beam headlight (Left side) | 10 |
| 8 | High beam headlight (Right side) | 10 |
| 9 | CVT control module | 20 |
| 10 | Alternator | 7.5 |
| 11 | PTC cabin heater (Diesel models) | 30 |
| 11 | EyeSight driver-assist system (Models with EyeSight) | 10 |
| 12 | Moonroof / Sunroof | 20 |
| 13 | Engine Control Module (ECM) | 7.5 |
| 14 | 15 | |
| 15 | Ignition coils | 15 |
| 16 | Engine Control Module (ECM) | 15 |
| 17 | 15 | |
| 18 | Transmission Control Module (TCM) | 10 |
| 19 | Illumination / Lighting system | 10 |
| 20 | Rear combination lamps | 10 |
| 21 | Turn signals and hazard warning lights (Body Integrated Unit) | 15 |
| 22 | Power door locks (Body Integrated Unit) | 20 |
| 23 |
|
15 |
| 24 | Windshield washer pump | 10 |
| 25 | Windshield wipers | 30 |
| 26 |
|
25 |
| 27 | Secondary air injection valve (EJ204 engine) | 10 |
| 28 | Blower motor | 15 |
| 29 | Blower motor | 15 |
| 30 | Audio system | 25 |
| 31 | Auxiliary cooling fan | 25 |
| 32 | Main cooling fan | 25 |
| 33 | ABS / VDC control module | 30 |
| 34 | Glow plugs (Diesel models) | 7.5 |
| 35 | Front fog light (Right side) | 10 |
| 36 | Front fog light (Left side) | 10 |
| 37 | Backup power supply (Body Integrated Unit) | 20 |
| Relay Box | |
|
|
| 1 | High beam headlights |
| 2 | Rear window defogger |
| 3 | Low beam headlights |
| 4 | A/C compressor magnetic clutch |
| 5 | Power windows |
| 6 | Windshield wipers |
| 7 | Front fog lights |
| 8 | Horn relay |
| 9 | Parking lights / Tail lights |
Passenger Compartment Fuse Box
Located under the driver’s side dashboard, behind the access cover.
Overview of the interior fuse box (Subaru Legacy).
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Protected Component | Rating (A) |
| 1 |
|
15 |
| 2 | Rear left power window | 20 |
| 3 | Driver power window | 20 |
| 4 |
|
7.5 |
| 5 | Instrument cluster (Combination meter) | 7.5 |
| 6 | Power mirrors | 7.5 |
| 7 | Body Integrated Unit (BIU) | 7.5 |
| 8 | Brake lights (Stop lamps) | 15 |
| 9 | Heated seats relay | 15 |
| 10 | Battery power supply (B+ circuit) | 7.5 |
| 11 | Turn signal flasher unit | 7.5 |
| 12 |
|
15 |
| 13 | 12V Auxiliary Power Outlet | 20 |
| 14 | Spare | 10 |
| 15 | Rear right power window | 20 |
| 16 | Spare | - |
| 17 | Windshield wiper de-icer | 15 |
| 18 | Reverse lights (Back-up lamps) | 7.5 |
| 19 | Electronic Parking Brake (EPB) control module | 7.5 |
| 20 |
|
10 |
| 21 | Starter relay | 7.5 |
| 22 | Air conditioning (A/C) system | 15 |
| 23 | Spare | - |
| 24 |
|
15 |
| 25 | Supplemental Restraint System (SRS Airbags) | 15 |
| 26 | Main radiator fan relay | 7.5 |
| 27 | Power window relay | 30 |
| 28 | Spare | - |
| 29 | Front passenger power window | 20 |
| 30 | Spare | - |
| 31 | Automatic climate control unit | 7.5 |
| 32 | Steering lock control module | 7.5 |
| 33 |
|
7.5 |