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TROUBLE DIAGNOSIS ATC-107 C D E F G H I K L M A B ATC A/C Display is Malfunctioning NJS0008T DIAGNOSIS PROCEDURE SYMPTOM: A/C display is not shown. 1. CHECK CIRCUIT CONTINUITY BETWEEN AV AND NAVI C/U (AV C/U) AND AUTO AMP. 1. Disconnect auto amp. connector and AV and NAVI C/U (AV C/U) 2. Check continuity between AV and NAVI C/U harness connector 3. Check continuity between AV and NAVI C/U harness connector OK or NG OK >> GO TO 2. NG >> ● Check harness between auto amp. and AV and NAVI ● Check connector housings for disconnected or loose 2. A/C–AV, AC–CLK COMMUNICATION SIGNAL CHECK 1. Reconnect auto amp. connector. 2. Turn the ignition switch ON. 3. Check voltage between AV and NAVI C/U harness connector OK or NG OK >> GO TO 3. NG >> Replace auto amp. 37, 39 – Ground : Continuity should not exist. 44, 45 – Ground : Continuity should not exist. 37, 44 – 9 : Continuity should exist. 39, 45 – 20 : Continuity should exist. RJIA1576E RJIA1577E 37, 39 – Ground : Approx. 3.5 V or more 44, 45 – Ground : Approx. 3.5 V or more RJIA1578E |