BOSE AMP.: Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK FUSE 

   Check that the following fuses are not blown.

   Terminal No.	Signal name	Fuse No.
   50	Battery power supply	11 (15A)
   51		12 (15A)

   Are the fuses blown? 

   YES: Replace the blown fuse after repairing the affected circuit.

   NO: GO TO 2.

2. CHECK POWER SUPPLY CIRCUIT 
   1. Disconnect BOSE speaker amp. connector B121.
   2. Check voltage between BOSE speaker amp. connector B121 and ground.

      BOSE speaker amp.		Ground	Voltage (Approx.)
      Connector	Terminal
      B121	50	-	Battery voltage
      	51

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness or connectors.

3. CHECK GROUND CIRCUIT 
   1. Turn ignition switch OFF.
   2. Check continuity between BOSE speaker amp. connector B121 and ground.

      BOSE speaker amp.		Ground	Continuity
      Connector	Terminal
      B121	47	-	Yes
      	52

      Is the inspection result normal? 

      YES: Inspection End.

      NO: Repair or replace harness or connectors.