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 INSTRUMENT PANEL TWEETER SIGNAL CIRCUIT CONTINUITY 
   1. Disconnect BOSE speaker amp. connector B122 and suspect instrument panel tweeter connector.
   2. Check continuity between BOSE speaker amp. connector B122 and suspect instrument panel tweeter connector.

      BOSE speaker amp.		Instrument panel tweeter		Continuity
      Connector	Terminal	Connector	Terminal
      B122	56	M62 (LH)	1	Yes
      	69		2
      	71	M73 (RH)	1
      	70		2

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

      BOSE speaker amp.		Ground	Continuity
      Connector	Terminal
      B122	56	-	No
      	69
      	71
      	70

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness or connectors.

3. CHECK INSTRUMENT PANEL TWEETER SIGNAL 
   1. Connect BOSE speaker amp. connector B122 and suspect instrument panel 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.		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      56	69	Audio signal output
      71	70

      Is the inspection result normal? 

      YES: Replace instrument panel 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 ".