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AV-120 < DTC/CIRCUIT DIAGNOSIS > [MONOCHROME DISPLAY - W/ BOSE] SUBWOOFER 1. Connect BOSE speaker amp. connector B110 and suspect rear subwoofer connector. 2. Turn ignition switch to ACC. 3. Push POWER switch. 4. Check the signal between BOSE speaker amp. harness connec- tor B110 terminals with CONSULT or oscilloscope. Is the audio signal voltage as specified? YES >> Replace suspect rear subwoofer. Refer to . NO >> GO TO 4. 4. HARNESS CHECK 1. Disconnect audio unit connector M132 and BOSE speaker amp. connector B109. 2. Check continuity between audio unit harness connector M132 (A) and BOSE speaker amp. harness connector B109 (B). 3. Check continuity between audio unit harness connector M132 (A) terminal and ground. Are continuity test results as specified? YES >> GO TO 5. NO >> • Check connector housings for disconnected or loose terminals. • Repair harness or connector. 5. REAR SUBWOOFER SIGNAL CHECK Connector Terminals Condition Reference signal (+) (-) B110 13 8 Receive au- 5 6 AWNIA1706ZZ SKIA0177E A B Continuity Connector Terminal Connector Terminal M132 4 B109 24 Yes 5 23 13 26 14 25 A — Continuity Connector Terminal M132 4 Ground No 5 13 14 AWNIA1704ZZ |