Subaru Legacy III 1998-2003 Wiring DIagram, Electrical System
Subaru Legacy III 1998-2003 Wiring Diagram, Electrical System — a detailed guide to the electrical diagrams of the third generation Subaru Legacy (BE / BH). Includes wiring diagrams, fuse and relay locations, grounding information and electrical system components. Helps in diagnosing faults, repairing and maintaining the car's electrical system. Useful for both owners and auto mechanics.
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Subaru Legacy III 1998-2003 Main problems with wiring, electrical, sensors
1. Wiring harness problems
Over time, the wiring under the hood and in the doors wears out, especially in places where it bends (door hinges, trunk, engine compartment).
Oxidation of contacts in connectors, especially in climates with high humidity.
2. Sensor malfunctions
Crankshaft position (CKP) and camshaft (CMP) sensors - if they fail, the engine may not start or run erratically.
Mass air flow (MAF) sensor - leads to unstable engine operation, loss of power and increased fuel consumption.
ABS sensors - dirt and damage may cause an error in the anti-lock brake system.
Coolant temperature (ECT) sensor - incorrect readings can lead to problems with starting and operation of the cooling fan.
3. Generator and power supply malfunctions
Failure of the voltage regulator relay leads to voltage surges and overheating of the wiring. A loose engine ground contact causes difficult starting and malfunctions of electrical equipment.
A discharged or old battery causes errors in the ABS, SRS and ECU systems.
4. Problems with fuses and relays
Fuses and relays can burn out due to short circuits in the wiring or incorrect operation of electrical equipment.
Problems with the main fuel pump relay can lead to unstable starting or stopping of the engine.
5. Malfunction of the lighting system and instrument panel
Failure of the light control unit (especially in models with automatic headlights).
Problems with the instrument panel lighting associated with oxidation of contacts or burnt-out bulbs.
6. Problems with the central lock and window lifters
Failure of the window lifter motors, often due to wear or oxidation of the contacts.
Broken wires at the bends of the door leads to incorrect operation of the central lock.