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POWER SUPPLY AND GROUND CIRCUIT STC-135 < COMPONENT DIAGNOSIS > [WITH 4WAS] C D E F H I J K L M A B STC N O P • Open between the battery and 4WAS rear motor relay harness connector No. 3 terminal 4. CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (3) 1. Remove the noise suppressor. 2. Check continuity between the noise suppressor harness connector and the ground. Is the inspection result normal? YES >> GO TO 5. NO >> Repair or replace the harnesses and connectors. 5. CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (4) 1. Connect 4WAS main control unit harness connector. 2. Turn the ignition switch ON. CAUTION: Never start the engine. 3. Check the voltage between 4WAS main control unit harness connectors. 4. Turn the ignition switch OFF. Is the inspection result normal? YES >> GO TO 6. NO >> Replace 4WAS main control unit. Refer to 6. CHECK 4WAS REAR MOTOR RELAY 1. Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal. CAUTION: • Never make the terminals short. 2. Check the continuity between 4WAS rear motor relay connector terminals. 3. Check the resistance between 4WAS rear motor relay connector terminals. Is the inspection result normal? YES >> GO TO 7. Noise suppressor Continuity Connector Terminal B51 3 – Ground Not existed 5 – Ground B52 1 – Ground Not existed 2 – Ground Existed 4WAS main control unit Voltage (Approx.) Connector Terminal B54 25 – Ground Battery voltage 4WAS rear motor relay Continuity Connector Terminal Condition B53 3 – 5 Apply the voltage between No. 1 terminal and No. 2 ter- minal. Existed Do not apply the voltage be- tween No. 1 terminal and No. 2 terminal. Not existed 4WAS rear motor relay Resistance (Approx.) Connector Terminal B53 1 – 2 50 Ω |