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AV-80 < COMPONENT DIAGNOSIS > [BOSE AUDIO WITHOUT NAVIGATION] CENTER SPEAKER 3. HARNESS CHECK 1. Disconnect audio unit connector M43 and BOSE speaker amp. connector B121. 2. Check continuity between audio unit harness connector M43 (A) and BOSE speaker amp. harness connector B121 (B). 3. Check continuity between audio unit harness connector M43 (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 audio unit connector and BOSE speaker amp. connec- tor. 2. Turn ignition switch ACC. 3. Push “POWER” switch. 4. Check the signal between audio unit harness connector M43 terminals with CONSULT-III or oscilloscope. Are the audio signal voltage readings as specified? YES >> Replace BOSE speaker amp. Refer to . NO >> Replace audio unit. Refer to Terminals Continuity A B Connector Terminal Connector Terminal M43 2 B121 75 Yes 3 76 11 73 12 74 Terminals Continuity A — Connector Terminal M43 2 Ground No 3 11 12 ALNIA0136ZZ Connector Terminals Condition Reference signal (+) (-) M43 2 3 Receive 11 12 ALNIA0171ZZ SKIA0177E |