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AV-160 < DTC/CIRCUIT DIAGNOSIS > [NAVIGATION WITHOUT BOSE] U12AB ANTENNA U12AB ANTENNA DTC Logic INFOID:0000000011276854 DTC DETECTION LOGIC Diagnosis Procedure INFOID:0000000011276855 Regarding Wiring Diagram information, refer to . 1. AM-FM ANTENNA INSPECTION Visually inspect the antenna base (AM-FM antenna) and antenna feeder. Refer to . Is inspection result normal? YES >> GO TO 2. NO >> Repair or replace malfunctioning components. 2. CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND ANTENNA BASE 1. Turn ignition switch OFF. 2. Disconnect AV control unit connector M139 and antenna base connector M502. 3. Check continuity between AV control unit connector M139 and antenna base connector M502. 4. Check continuity between AV control unit connector M139 and ground. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace harness or connectors. 3. CHECK AV CONTROL UNIT VOLTAGE 1. Connect AV control unit connector M139. 2. Turn ignition switch ON. 3. Check voltage between AV control unit connector M139 and ground. Is the inspection result normal? YES >> Replace antenna base. Refer to AV-213, "Removal and Installation" . NO >> Replace AV control unit. Refer to AV-200, "Removal and Installation" . CONSULT Display DTC Detection Condition Possible Cause FM Antenna error Open or short to ground is detected in AM-FM an- • AM-FM antenna disconnection. signal circuit. AV control unit Antenna base Continuity Connector Terminal Connector Terminal M139 52 M502 2 Yes AV control unit Ground Continuity Connector Terminal M139 52 — No AV control unit Ground Voltage (Approx.) Connector Terminal M139 52 — 5.0 V |