Subaru Legacy IV 2003-2009 BL/BP Wiring Diagram. Electrical System

Subaru Legacy IV 2003-2009 BL/BP Wiring Diagram. Electrical System - a detailed guide to electrical diagrams and wiring for fourth-generation vehicles. Includes wiring diagrams, relay and fuse locations, fault diagnostics, sensor information, and engine electrical system information. Useful for car enthusiasts, mechanics, and repair professionals.

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Burning bulbs and blown fuses

A common problem is the failure of brake lights, side lights and headlights.

Blown fuses due to a short circuit in the wiring.

Problems with the generator and battery charging

Worn out generator brushes, failure of the diode bridge.

Poor contact in the connectors leads to voltage surges.

Door wiring faults

Break or damage to the wiring harness at the junction of the door to the body.

Failure of the central lock, window lifters, mirrors.

Engine sensor faults

Crankshaft position sensor (CKP) - problems with starting the engine, errors P0335.

Camshaft position sensor (CMP) - interruptions in engine operation, error P0340.

Mass air flow sensor (MAF) - deterioration in dynamics, errors P0101-P0104.

Problems with the control unit and CAN bus

BCM (Body Control Module) malfunctions cause malfunctions in lighting, power windows and alarms.

Oxidation of contacts in CAN bus connectors leads to problems with electronics.

Problems with climate control and heater

Failure of the heater fan resistor.

Failure of the damper servos, due to which the air temperature is not regulated.

ABS and ESP system failures

Failure of wheel speed sensors.

Oxidation of ABS unit contacts, errors U0122, C0057