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POWER SUPPLY AND GROUND CIRCUIT SEC-271 < DTC/CIRCUIT DIAGNOSIS > [WITHOUT INTELLIGENT KEY SYSTEM] C D E F G H I J L M A B SEC N O P POWER SUPPLY AND GROUND CIRCUIT SIREN CONTROL UNIT SIREN CONTROL UNIT : Diagnosis Procedure INFOID:0000000010479798 1. CHECK FUSE Check that the following fuse is not blown. Is the fuse fusing? YES >> Replace the blown fuse after repairing the affected circuit if a fuse is blown. NO >> GO TO 2. 2. CHECK POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect siren control unit connector. 3. Check voltage between siren control unit harness connector and the ground. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace harness. 3. CHECK GROUND CIRCUIT Check continuity between siren control unit harness connectors and the ground. Is the inspection result normal? YES >> INSPECTION END NO >> Repair or replace harness. Signal name Fuse Battery power supply 20 (5 A) (+) ( − ) Voltage (Approx.) Siren control unit Connector Terminal Ground B27 2 Battery voltage Siren control unit Ground Continuity Connector Terminal B27 5 Existed |