Diagnosis Procedure

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

1. HARNESS CHECK
   1. Disconnect audio unit connector M43 and suspect front tweeter connector.
   2. Check continuity between audio unit harness connector M43 (A) and suspect front tweeter harness connector (B).
      CONTINUITY REFERENCE CHART
      
      

      A		B		Continuity
      Connector	Terminal	Connector	Terminal
      M43	2	M109	1	Yes
      	3		2
      	11	M111	1
      	12		2

   3. Check continuity between audio unit harness connector M43 (A) and ground.
      CONTINUITY REFERENCE CHART
      
      

      A		-	Continuity
      Connector	Terminal
      M43	2	Ground	No
      	3
      	11
      	12

      Fig 1: Checking Continuity Between Audio Unit Harness Connector M43 And Ground

      

      Are the continuity results as specified? 

      YES: GO TO 2

      NO:

      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
2. FRONT TWEETER SIGNAL CHECK
   1. Connect audio unit connector M43 and front tweeter connector.
   2. Turn ignition switch to ACC.
   3. Push audio unit "POWER" switch.
   4. Check the signal between audio unit harness connector M43 terminals with CONSULT-III or oscilloscope.
      SIGNAL REFERENCE CHART
      
      

      (+)		(-)	Condition	Reference signal
      Connector	Terminal	Terminal
      M43	2	3	Receive audio signal
      	11	12

      Fig 2: Checking Signal Between Audio Unit Harness Connector M43 Terminals With CONSULT-III Or Oscilloscope

      

      Is the audio signal voltage as specified? 

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

      NO: Replace audio unit. Refer to "REMOVAL AND INSTALLATION (TYPE 2) ".