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AV-384 < DTC/CIRCUIT DIAGNOSIS > [COLOR DISPLAY - W/ BOSE] U1255 SATELLITE RADIO TUNER U1255 SATELLITE RADIO TUNER Description INFOID:0000000009471336 DTC Logic INFOID:0000000009471337 Diagnosis Procedure INFOID:0000000009471338 Regarding Wiring Diagram information, refer to AV-449, "Wiring Diagram - With BOSE Audio system Without 1. CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT Check satellite radio tuner power supply and ground circuit. Refer to AV-392, "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 M153 and satellite radio tuner connector B111. 3. Check continuity between AV control unit harness connector M153 (A) and satellite radio tuner harness connector B111 (B). 4. Check continuity between AV control unit harness connector M153 (A) and ground. Part name Description SATELLITE RADIO TUNER • Inputs the satellite radio signal from satellite radio antenna and outputs the sound signal to the AV control unit. • It is controlled with the AV control unit and serial communication (communica- tion signal and request signal). DTC Display contents of CONSULT DTC Detection Condition Possible causes U1255 SAT CONN When either one of the following items are detected: are malfunctioning. • serial communication circuits between AV control unit and satellite radio tuner are malfunctioning. • serial communication or request signal between AV control unit and satellite radio tuner is malfunctioning. • request signal circuit between AV control unit and sat- ellite radio tuner is malfunctioning. • Satellite radio tuner power supply and ground circuits. • Serial communication circuits be- tween AV control unit and satellite • Request signal circuit between AV control unit and satellite radio tun- A B Continuity Connector Terminals Connector Terminals M153 28 B111 28 Yes 29 29 30 30 A — Continuity Connector Terminals AWNIA2034ZZ |