Diagnosis Procedure

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

1. CONNECTOR CHECK 

   Check the AV control unit, BOSE speaker amp. and speaker connectors for the following:

   • Proper connection
   • Damage
   • Disconnected or loose terminals

     Is the inspection result normal? 

     YES: GO TO 2.

     NO: Repair the terminals or connectors.

2. CHECK CENTER SPEAKER SIGNAL CIRCUIT CONTINUITY 
   1. Disconnect BOSE speaker amp. connector B122 and center speaker connector M110.
   2. Check continuity between BOSE speaker amp. connector B122 and center speaker connector M110.

      BOSE speaker amp.		Center speaker		Continuity
      Connector	Terminal	Connector	Terminal
      B122	57	M110	1	Yes
      	58		2

   3. Check continuity between BOSE speaker amp. connector B122 and ground.

      BOSE speaker amp.		Ground	Continuity
      Connector	Terminal
      B122	57	-	No
      	58

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness or connectors.

3. CHECK CENTER SPEAKER SIGNAL 
   1. Connect BOSE speaker amp. connector B122 and center speaker connector M110.
   2. Turn ignition switch to ACC.
   3. Push AV control unit POWER switch.
   4. Check signal between the terminals of BOSE speaker amp. connector B122.

      BOSE speaker amp. connector B122		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      57	58	Audio signal output

      Is the inspection result normal? 

      YES: Replace center speaker. Refer to "REMOVAL AND INSTALLATION ".

      NO: GO TO 4.

4. CHECK PRE-AMP SIGNAL CIRCUIT CONTINUITY 
   1. Disconnect AV control unit connector M165 and BOSE speaker amp. connector B120.
   2. Check continuity between AV control unit connector M165 and BOSE speaker amp. connector B120.

      AV control unit		BOSE speaker amp.		Continuity
      Connector	Terminal	Connector	Terminal
      M165	125	B120	29	Yes
      	133		9

   3. Check continuity between AV control unit connector M165 and ground.

      AV control unit		Ground	Continuity
      Connector	Terminal
      M122	125	-	No
      	133

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace harness or connectors.

5. CHECK PRE-AMP SIGNAL 
   1. Connect AV control unit connector M165 and BOSE speaker amp. connector B120.
   2. Turn ignition switch to ACC.
   3. Push AV control unit POWER switch.
   4. Check signal between the terminals of AV control unit connector M165.

      AV control unit connector M165		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      125	133	Audio signal output

      Is the inspection result normal? 

      YES: Replace BOSE speaker amp. Refer to "REMOVAL AND INSTALLATION ".

      NO: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION - AV CONTROL UNIT ".