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AV-238 < DTC/CIRCUIT DIAGNOSIS > [BOSE AUDIO WITHOUT NAVIGATION] U1243 DISPLAY UNIT U1243 DISPLAY UNIT DTC Logic INFOID:0000000009721745 Diagnosis Procedure INFOID:0000000009721746 1. CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT Check display unit power supply and ground circuit. Refer to AV-244, "DISPLAY UNIT : Diagnosis Procedure" . Is the inspection result normal? YES >> GO TO 2. NO >> Repair malfunctioning parts. 2. CHECK CONTINUITY COMMUNICATION CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect display unit connector and AV control unit connector. 3. Check continuity between display unit harness connector and AV control unit harness connector. 4. Check continuity between display unit harness connector and ground. Is the inspection result normal? YES >> GO TO 3. NO >> Repair harness or connector. 3. CHECK COMMUNICATION SIGNAL 1. Connect display unit connector and AV control unit connector. 2. Turn ignition switch ON. 3. Check signal between display unit harness connector and ground. DTC Display contents of CONSULT DTC detection condition Possible malfunction factor U1243 FRONT DISP CONN When either one of the following items are detected: functioning. • serial communication circuits between display unit and AV control unit are malfunctioning. • Display unit power supply and ground circuits. • Serial communication circuits be- tween display unit and AV control Display unit AV control unit Continuity Connector Terminals Connector Terminals M194 11 M172 51 Existed 22 39 Display unit Ground Continuity Connector Terminals M194 11 Not existed 12 |