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Diagnosis Procedure
1.CHECK SOUND SIGNAL CIRCUITS FOR SHORT TO GROUND
  1. Turn ignition switch OFF.
  2. Disconnect BOSE speaker amp. harness connector and subwoofer harness connector.
  3. Check the continuity between subwoofer harness connector and ground.
    SubwooferGroundContinuity
    ConnectorTerminal
    B664Not existed
Is the inspection result normal?
Replace subwoofer. Refer to Removal and Installation.
Repair or replace harness or connectors.