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STC-94 < COMPONENT DIAGNOSIS > [WITH 4WAS] C1909 4WAS MAIN CONTROL UNIT C1909 4WAS MAIN CONTROL UNIT Description INFOID:0000000000958839 • 4WAS rear actuator and the power steering solenoid valve is controlled by each sensor signal. the electric components and the mechanical components are malfunctioning. • The protection function mode stops 4WAS system intermittently when the input signal does not input to 4WAS main control unit. • 4WAS front control unit and 4WAS main control unit control the best control of 4WAS system by 4WAS com- munication line. DTC Logic INFOID:0000000000958840 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. RECHECK DTC With CONSULT-III 1. Turn the ignition switch OFF to ON. 2. Perform 4WAS main control unit self-diagnosis. Is DTC “C1909” detected? YES >> Proceed to diagnosis procedure. Refer to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000000958841 1. CHECK 4WAS MAIN CONTROL UNIT POWER SUPPLY 1. Turn the ignition switch OFF. 2. Disconnect 4WAS main control unit harness connector. 3. Check the voltage between 4WAS main control unit harness connector terminal and the ground. 4. Turn the ignition switch ON. CAUTION: Never start the engine. 5. Check the voltage between 4WAS main control unit harness connector terminal and the ground. Is the inspection result normal? YES >> GO TO 2. NG >> Check the following items. Repair or replace the malfunctioning parts. • 10A fuse (#45) open minal and the ground DTC Items (CONSULT-III screen terms) Diagnostic item is detected when... Possible cause C1909 CONTROL UNIT An error is detected inside 4WAS main control unit. 4WAS main control unit 4WAS main control unit Voltage (Approx.) Connector Terminal B54 27 – Ground 0 V 4WAS main control unit Voltage (Approx.) Connector Terminal B54 27 – Ground Battery voltage |