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TROUBLE DIAGNOSIS ATC-105 C D E F G H I K L M A B ATC No A/C Display is Shown EJS001YB 1. CHECK CIRCUIT CONTINUITY BETWEEN AV (AND NAVI) CONTROL UNIT AND AUTO AMP. 1. Disconnect auto amp. connector and AV and NAVI control unit 2. Check continuity between AV and NAVI control unit harness 3. Check continuity between AV and NAVI control unit harness 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 control unit harness con- 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. 3.5V or more 44, 45 – Ground : Approx. 3.5V or more RJIA1578E |