Subaru Legacy I-II 1989-1999 Electrical. Wiring Diagram

This section contains detailed wiring diagrams for Subaru Legacy cars of the first and second generations (1989-1999). You will find:

✅ Complete electrical diagrams for all vehicle systems.

✅ Pinout of connectors and color marking of wires.

✅ Wiring diagrams for headlights, instrument panel, ignition system, fuel system, windows, air conditioning, ABS and other systems.

✅ Diagnostics and troubleshooting of electrical wiring.

This manual will help in repairing and servicing the electrical system of your Subaru Legacy! 🚗⚡

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1. Wiring and contact problems

🔹 Contact oxidation – especially in connectors located in the engine compartment and under the bottom.

🔹 Broken wiring in the door corrugation – leads to non-working power windows, central locking, mirrors.

🔹 Wire harness chafing – insulation may be damaged due to vibration and age, causing short circuits.

2. Generator and battery charging problems

🔹 Generator diode bridge burnout – often leads to battery discharge or voltage surges.

🔹 Engine and body ground problems – weak or oxidized contacts can cause voltage drop, unstable electronics operation.

🔹 Generator overheating – due to high load, especially when connecting additional electronics.

3. Starter malfunctions

🔹 Sticking solenoid relay – the car may not start or the starter will “click”.

🔹 Wear of starter brushes – leads to difficulty starting the engine.

4. Lighting problems

🔹 Burnt out low/high beam bulbs – due to old wiring or generator.

🔹 Blown fuses – often associated with a short circuit.

🔹 Headlight problems – oxidation of connectors, burnt out bulbs, relay failure.

4. Electronics and sensor problems

🔹 Failure of the crankshaft sensor (CKP) or camshaft – leads to difficulties with starting the engine or its unstable operation.

🔹 Throttle position sensor (TPS) glitches – the car starts to jerk or holds the speed unstably.

🔹 Malfunction of ABS sensors - the "ABS" lamp lights up on the panel, ABS stops working.

5. Problems with the dashboard and buttons

🔹 The dashboard sometimes blinks or does not show some readings - due to poor contacts in the connectors.

🔹 Malfunction of the window lift and central lock buttons - due to poor contacts or oxidation.

🔹 Malfunction of the radio and speakers - wire breaks, poor contacts.

How to avoid problems with wiring on a Subaru Legacy II (1993-1999)?

✅ Check the condition of the generator and battery terminals.

✅ Clean and lubricate the contacts (especially in the fuse and relay box).

✅ Check the wiring harnesses for damage.

✅ Use high-quality fuses and bulbs - cheap analogs often burn out.

✅ Conduct diagnostics of electrical equipment once a year.