Subaru Forester SJ, 2012-2018 Wiring Diagram. Electrical System

This section contains detailed electrical diagrams for the Subaru Forester SJ (2012–2018), covering all key elements of the vehicle's electrical wiring and electrical equipment.

📌 What's included?

Wiring diagrams for the main components and systems.

Location of fuses, relays, and connectors.

Diagnostics of electrical system faults.

Descriptions of sensors and their testing.

Color coding of wires and specifications.

This material will help car owners, electricians, and service station technicians understand the vehicle's electrical system, identify faults, and repair wiring. 🚗⚡

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🔌 Main wiring problems

1️⃣ Blown fuses due to short circuit

Causes: moisture ingress, damaged wiring.

Frequently affected: heated glass, lighting, multimedia.

Solution: diagnostics of wiring, sealing of connections, ground check.

2️⃣ Oxidation of electrical wiring contacts

Most often affected are connectors under the hood and in the doors.

Can lead to poor operation of window lifters, headlights, ABS sensors.

Solution: cleaning contacts, treatment with protective compounds (WD-40, Liqui Moly).

3️⃣ Broken wires in the door corrugation

Due to frequent opening/closing of doors, the wires of window lifters, central locking, speakers break.

Solution: disassembling the corrugation, soldering wires, installing reinforced insulation.

⚠ Sensor issues

4️⃣ ABS / ESP sensor errors

Often caused by dirt or damaged wiring on the wheels.

Manifested by ABS and ESP indicators on the dashboard.

Solution: check the wiring of the sensors on the wheels, clean the connectors, replace damaged wires.

5️⃣ Malfunction of the automatic transmission selector position sensor

Can lead to problems with starting the engine, switching gearbox modes.

Solution: clean the contacts, replace the sensor.

6️⃣ Malfunctions in the fuel level sensor

Indicates an incorrect fuel level, may freeze.

Solution: check the connectors, clean the float, replace the sensor in the tank.

🔦 Electronics and lighting

7️⃣ Burnt-out LEDs in DRLs

Factory daytime running lights (DRL) become dim or fail over time.

Solution: replace LED modules or install alternative lamps.

8️⃣ Weak generator

When you turn on the heated glass, headlights and multimedia, the voltage drops, the battery discharges faster.

Solution: diagnose the generator, install a battery with a higher capacity.

9️⃣ Glitches in multimedia and rear view camera

Possible screen freezes, no image from the camera.

Solution: check connections, update multimedia firmware.