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 FRONT TWEETER SIGNAL CIRCUIT CONTINUITY 
   1. Disconnect BOSE speaker amp. connector B122 and suspect front tweeter connector.
   2. Check continuity between BOSE speaker amp. connector B122 and suspect front door speaker connector.

      BOSE speaker amp.		Front tweeter		Continuity
      Connector	Terminal	Connector	Terminal
      B122	64	M109 (LH)	1	Yes
      	75		2
      	59	M111 (RH)	1
      	72		2

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

      BOSE speaker amp.		Ground	Continuity
      Connector	Terminal
      B122	64	-	No
      	75
      	59
      	72

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness or connectors.

3. CHECK FRONT TWEETER SIGNAL 
   1. Connect BOSE speaker amp. connector B122 and suspect front tweeter connector.
   2. Turn ignition switch to ACC.
   3. Push AV control unit POWER switch.
   4. Check signal between terminals of BOSE speaker amp. connector B122.

      BOSE speaker amp. connector B122		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      64	75	Audio signal output
      59	72

      Is the inspection result normal? 

      YES: Replace front tweeter. Refer to "REMOVAL AND INSTALLATION ".

      NO: GO TO 4.

4. CHECK PRE-AMP SIGNAL CIRCUIT CONTINUITY 
   1. Disconnect AV control unit connector M161 and BOSE speaker amp. connector B120.
   2. Check continuity between AV control unit connector M161 and BOSE speaker amp. connector B120.

      AV control unit		BOSE speaker amp.		Continuity
      Connector	Terminal	Connector	Terminal
      M161	2	B120	25	Yes
      	3		5
      	11		26
      	12		6

   3. Check continuity between AV control unit connector M161 and ground.

      AV control unit		Ground	Continuity
      Connector	Terminal
      M161	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 M161 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 M161.

      AV control unit connector M161		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 ".