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AV-336 < DTC/CIRCUIT DIAGNOSIS > [NAVIGATION WITH BOSE] CENTER SPEAKER CENTER SPEAKER Diagnosis Procedure INFOID:0000000011277007 Regarding Wiring Diagram information, refer to . 1. CONNECTOR CHECK Check the AV control unit, Bose speaker amp. and speaker connectors for the following: • Proper connection • Damage • Disconnected or loose terminals YES >> GO TO 2. NO >> Repair the terminals or connectors. 2. CHECK CENTER SPEAKER SIGNAL CIRCUIT CONTINUITY (BOSE SPEAKER AMP.) 1. Disconnect Bose speaker amp. connector B138 and center speaker connector M70. 2. Check continuity between Bose speaker amp. connector B138 and center speaker connector M70. 3. Check continuity between Bose speaker amp. connector B138 and ground. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace harness or connectors. 3. CHECK CENTER SPEAKER SIGNAL (BOSE SPEAKER AMP.) 1. Connect Bose speaker amp. connector B138 and center speaker connector M70. 2. Turn ignition switch to ON. 3. Push AV control unit POWER switch. 4. Check signal between Bose speaker amp. connector B138 and ground. Is the inspection result normal? Bose speaker amp. Center speaker Continuity Connector Terminal Connector Terminal B138 15 M70 1 Yes 28 2 Bose speaker amp. Ground Continuity Connector Terminal B138 15 — No 28 Bose speaker amp. connector B138 Condition Reference value (+) ( −) Terminal Terminal 15 28 Audio signal output SKIB3609E |