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 REAR DOOR TWEETER SIGNAL CIRCUIT CONTINUITY 
   1. Disconnect BOSE speaker amp. connector B121 and suspect rear door tweeter connector.
   2. Check continuity between BOSE speaker amp. connector B121 and suspect rear door tweeter connector.

      BOSE speaker amp.		Rear door tweeter		Continuity
      Connector	Terminal	Connector	Terminal
      B121	45	D252 (LH)	1	Yes
      	46		2
      	41	D352 (RH)	1
      	42		2

   3. Check continuity between BOSE speaker amp. connector B121 and ground.

      BOSE speaker amp.		Ground	Continuity
      Connector	Terminal
      B121	45	-	No
      	46
      	41
      	42

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness or connectors.

3. CHECK REAR DOOR TWEETER SIGNAL 
   1. Connect BOSE speaker amp. connector B121 and suspect rear door 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 B121.

      BOSE speaker amp. connector B121		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      45	46	Audio signal output
      41	42

      Is the inspection result normal? 

      YES: Replace rear door 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	4	B120	27	Yes
      	5		7
      	13		28
      	14		8

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

      AV control unit		Ground	Continuity
      Connector	Terminal
      M161	4	-	No
      	5
      	13
      	14

      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
      4	5	Audio signal output
      13	14

      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 ".