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AV-20 < ECU DIAGNOSIS INFORMATION > [BASE AUDIO] AUDIO UNIT 37 (B) Ground Antenna amp. ON signal Output ON Audio unit ON, AM or FM Battery voltage 38 (B) Ground AM/FM antenna signal Input ON Audio unit ON, AM or FM 5.0 V Terminal (Wire color) Description Condition Reference value (Approx.) + – Signal name Input/ Output Ignition switch Operation |