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AV-92 < COMPONENT DIAGNOSIS > [AUDIO SYSTEM] CENTER SPEAKER YES >> Replace center speaker. Refer to AV-173, "Removal and Installation" . NO >> GO TO 3. 3. HARNESS CHECK 1. Disconnect AV control unit connector M42 and BOSE speaker amp. connector M113. 2. Check continuity between AV control unit harness connector M42 (A) and BOSE speaker amp. harness connector M113 (B). 3. Check continuity between AV control unit harness connector M42 (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. FRONT SPEAKER SIGNAL CHECK 1. Connect AV control unit connector and BOSE speaker amp. connector. 2. Turn ignition switch ACC. 3. Push “POWER” switch. 4. Check the signal between AV control unit harness connector M42 terminals with CONSULT-III or oscilloscope. Are the audio signal voltage readings as specified? YES >> Replace BOSE speaker amp. Refer to . NO >> Replace AV control unit. Refer to A B Continuity Connector Terminal Connector Terminal M42 2 M113 18 Yes 3 32 11 19 12 20 A — Continuity Connector Terminal M42 2 Ground No 3 11 12 ALNIA0416GB Connector Terminals Condition Reference signal (+) (-) M42 2 3 Receive 11 12 ALNIA0417GB SKIA0177E |