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TROUBLE DIAGNOSIS ATC-121 C D E F G H I K L M A B ATC DIAGNOSTIC PROCEDURE FOR MULTIPLEX COMMUNICATION CIRCUIT (REAR CONTROL ● Rear control switch A/C operation does not work. 1. CHECK FOR AUTO AMP. OUTPUT 1. Turn ignition switch ON. 2. Confirm multiplex communication signal between auto amp. har- OK or NG OK >> GO TO 2 NG >> Replace auto amp. 2. CHECK CIRCUIT CONTINUITY BETWEEN REAR CONTROL SWITCH AND AUTO AMP. 1. Turn ignition switch OFF. 2. Disconnect rear control switch and auto amp. connector. 3. Check continuity between rear control switch harness connector OK or NG OK >> GO TO 3. NG >> Repair harness or connector. Terminals Voltage (+) (-) Auto amp. connector Terminal No. (wire color) M120 31 (GY/L) Ground 30 (BR/W) RJIA1740E RJIA0212E HAK0363D 3 – 30 : Continuity should exist. 4 – 31 : Continuity should exist. RJIA1741E |