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AV-220 < COMPONENT DIAGNOSIS > [BOSE AUDIO WITH NAVIGATION] CENTER SPEAKER 3. HARNESS CHECK 1. Disconnect AV control unit connector M47 and BOSE speaker amp. connector B121. 2. Check continuity between audio unit harness connector M47 (A) and BOSE speaker amp. harness connector B121 (B). 3. Check continuity between AV control unit harness connector M47 (A) and ground. Are continuity test results as specified? YES >> GO TO 4 NO >> • Check connector housings for disconnected or loose terminals. • Repair harness or connector. 4. CENTER SPEAKER SIGNAL CHECK 1. Connect AV control unit connector and BOSE speaker amp. connector. 2. Turn ignition switch to ACC. 3. Push “POWER” switch. 4. Check the signal between audio unit harness connector M47 terminals with CONSULT-III or oscilloscope. Is the audio signal voltage reading as specified? YES >> Replace BOSE speaker amp. Refer to . NO >> Replace AV control unit. Refer to Terminals Continuity A B Connector Terminal Connector Terminal M47 2 B121 75 Yes 3 76 11 73 12 74 Terminals Continuity A — Connector Terminal M47 2 Ground No 3 11 12 ALNIA0136ZZ Connector Terminals Condition Reference signal (+) (-) M47 2 3 Receive 11 12 ALNIA0171ZZ SKIA0177E |