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AV U1255 SATELLITE RADIO TUNER AV-157 < COMPONENT DIAGNOSIS > [BOSE AUDIO WITHOUT NAVIGATION] C D E F G H I J K L M B A O P U1255 SATELLITE RADIO TUNER Description INFOID:0000000001559282 DTC Logic INFOID:0000000001559283 Diagnosis Procedure INFOID:0000000001559284 1. CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT Check satellite radio tuner power supply and ground circuit. Refer to AV-164, "SATELLITE RADIO TUNER : . Is the inspection result normal? YES >> GO TO 2. NO >> Repair malfunctioning parts. 2. CHECK CONTINUITY COMMUNICATION CIRCUIT AND REQUEST SIGNAL CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect AV control unit connector and satellite radio tuner connector. 3. Check continuity between AV control unit harness connector terminals 28, 29, 30 and satellite radio tuner 4. Check continuity between AV control unit harness connector terminals 28, 29 and 30. Is the inspection result normal? YES >> GO TO 3. NO >> Repair harness or connector. 3. CHECK AV CONTROL UNIT VOLTAGE 1. Connect AV control unit connector. 2. Turn ignition switch ON. 3. Check voltage between AV control unit harness connector terminal 28, 29 and ground. Part name Description SATELLITE RADIO TUNER • Inputs the satellite radio signal from satellite radio antenna and outputs it to the AV control unit. • It is controlled with the communication (communication signal, request signal) from AV control unit. DTC Display contents of CONSULT-III DTC Detection Condition Possible causes U1255 SAT CONN • Satellite radio tuner power supply and ground circuit malfunction is detected. • Malfunction is detected in communication circuit be- tween AV control unit and satellite radio tuner. • Malfunction is detected in communication signal be- tween AV control unit and satellite radio tuner. • Malfunction is detected in request signal circuit be- tween AV control unit and satellite radio tuner. • Satellite radio tuner power supply and ground circuit. • Communication circuit between AV control unit and satellite radio tun- • Request signal circuit between AV control unit and satellite radio tun- 28 - 8 : Continuity should exist. 29 - 9 : Continuity should exist. 30 - 10 : Continuity should exist. 28 - Ground : Continuity should not exist. 29 - Ground : Continuity should not exist. 30 - Ground : Continuity should not exist. |