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 B130 and center speaker connector.
   2. Check continuity between BOSE speaker amp. connector B130 and center speaker connector M110.

      BOSE speaker amp.		Center speaker		Continuity
      Connector	Terminal	Connector	Terminal
      B130	69	M110	1	Yes
      	70		2

   3. Check continuity between BOSE speaker amp. connector B130 and ground.

      BOSE speaker amp.		Ground	Continuity
      Connector	Terminal
      B130	69	-	No
      	70

   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 B130 and center speaker connector M110.
   2. Turn ignition switch to ACC.
   3. Push AV control unit POWER switch.
   4. Check signal between terminals of BOSE speaker amp. connector B130.

      BOSE speaker amp. connector B130		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      69	70	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 M122 and BOSE speaker amp. connector B130.
   2. Check continuity between AV control unit connector M122 and BOSE speaker amp. connector B130.

      AV control unit		BOSE speaker amp.		Continuity
      Connector	Terminal	Connector	Terminal
      M122	2	B130	75	Yes
      	3		76
      	11		73
      	12		74

   3. Check continuity between AV control unit connector M122 and ground.

      AV control unit		Ground	Continuity
      Connector	Terminal
      M122	2	-	No
      	3
      	11
      	12

   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 M122 and BOSE speaker amp. connector B130.
   2. Turn ignition switch to ACC.
   3. Push AV control unit POWER switch.
   4. Check signal between the terminals of AV control unit connector M122.

      AV unit connector M122		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      2	3	Audio signal output
      11	12

   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 ".