Subaru Outback III 2003–2009 Wiring Diagram. Electrical System

This page contains detailed wiring diagrams for the Subaru Outback III (2003–2009) BP/BL. It shows the main electrical components, their locations, connector pinouts, fuses and relays, and diagnostic trouble codes.

What's included?

⚡ Wiring diagrams of the main systems

🔧 Location of fuses and relays

📌 Diagnostics and troubleshooting

This information will help owners, mechanics, and auto electricians in repairing and servicing the electrical systems of the Subaru Outback III.

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⚡ Main problems with wiring and electrics

🛠 Blown fuses and relay problems

A common cause is oxidation of contacts in the mounting block.

Symptoms: window lifters, heater fan, lighting do not work.

Solution: clean contacts, replace relays or fuses.

🛠 Oxidation and ground break

The problem occurs due to corrosion of ground contacts.

Symptoms: unstable operation of devices, flashing headlights, ABS/VDC errors.

Solution: clean and treat contact groups.

🛠 Frayed wiring harnesses

Often found in the engine and door frame area.

Symptoms: electronic errors, malfunctions of door locks and window lifters.

Solution: diagnostics with a multimeter, repair of damaged areas.

📟 Sensor issues

🛠 Crankshaft (CKP) and camshaft (CMP) sensor

Symptoms: poor starting, misfiring, P0335/P0340 error.

Cause: sensor contamination or failure.

Solution: cleaning contacts, replacing sensor.

🛠 Mass Air Flow (MAF) sensor

Symptoms: floating speed, increased fuel consumption, P0101-P0103 errors.

Cause: sensor contamination, air leak.

Solution: cleaning MAF sensor, checking intake leaks.

🛠 Lambda probes (O2 Sensor)

Symptoms: P0420, P0130 errors, increased fuel consumption.

Cause: probe wear, exhaust system contamination.

Solution: replacing oxygen sensor.

🛠 ABS and VDC sensors (wheel speed sensors)

Symptoms: ABS/VDC light is on, errors C0057, C0071.

Cause: dirty or faulty sensor.

Solution: clean or replace the sensor.

🔋 Electrical equipment problems

🛠 Weak generator

Symptoms: dim headlights, discharged battery, flashing battery icon.

Cause: worn brushes, belt or diode bridge.

Solution: generator diagnostics and repair.

🛠 Climate control is glitching

Symptoms: temperature is not adjusted, blower mode is stuck.

Cause: faulty damper drive.

Solution: disassemble the panel, replace the drive.

🛠 Central locking and window lifters

Symptoms: doors do not open with the button, windows do not rise well.

Reason: frayed wiring in the doors, worn motors.

Solution: restore wiring, replace motors.