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AV-316 < DTC/CIRCUIT DIAGNOSIS > [NAVIGATION WITH BOSE] U1265 BOSE AMP. U1265 BOSE AMP. DTC Logic INFOID:0000000011276982 Diagnosis Procedure INFOID:0000000011276983 Regarding Wiring Diagram information, refer to . 1. CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND BOSE SPEAKER AMP. 1. Turn ignition switch OFF. 2. Disconnect AV control unit connector M108 and Bose speaker amp. connector B138. 3. Check continuity between AV control unit connector M108 and Bose speaker amp. connector B138. 4. Check continuity between AV control unit connector M108 and ground. Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace harness or connectors. 2. CHECK AV CONTROL UNIT VOLTAGE 1. Connect AV control unit connector M108. 2. Turn ignition switch ON. 3. Check voltage between AV control unit connector M108 and ground. Is the inspection result normal? YES >> Replace Bose speaker amp. Refer to AV-372, "Removal and Installation" NO >> Replace AV control unit. Refer to AV-369, "Removal and Installation" . CONSULT Display DTC Detection Condition Possible Cause AMP ON TERMINAL Open or short to ground is detected in BOSE Open or short to ground in BOSE amp. ON signal AV control unit Bose speaker amp. Continuity Connector Terminal Connector Terminal M108 1 B138 31 Yes AV control unit Ground Continuity Connector Terminal M108 1 — No AV control unit Ground Voltage (Approx.) (+) (–) Connector Terminal M108 1 — Battery voltage |