Diagnosis Procedure

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

1. CHECK MICROPHONE SIGNAL CIRCUIT CONTINUITY 
   1. Turn ignition switch OFF.
   2. Disconnect AV control unit connector M124 and microphone connector.
   3. Check continuity between AV control unit connector M124 and microphone connector R109.

      AV control unit		Microphone		Continuity
      Connector	Terminal	Connector	Terminal
      M124	59	R109	3	Yes
      	60		1
      	75		4

   4. Check continuity between AV control unit connector M124 and ground.

      AV control unit		Ground	Continuity
      Connector	Terminal
      M124	59	-	No
      	60
      	75

   Is inspection result normal? 

   YES: GO TO  2.

   NO: Repair or replace harness or connectors.

2. CHECK MICROPHONE VCC VOLTAGE 
   1. Connect AV control unit connector M124.
   2. Turn ignition switch ON.
   3. Check voltage between terminals of AV control unit connector M124.

      AV control unit connector M124		Voltage (Approx.)
      (+)	(-)
      Terminal	Terminal
      60	59	5.0 V

   Is the inspection result normal? 

   YES: GO TO  3.

   NO: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION - AV CONTROL UNIT ".

3. CHECK MICROPHONE SIGNAL 
   1. Connect microphone connector.
   2. Check signal between terminals of AV control unit connector M124.

      AV control unit connector M124		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      75	59	Speak into microphone.

   Is the inspection result normal? 

   YES: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION - AV CONTROL UNIT ".

   NO: Replace microphone. Refer to "REMOVAL AND INSTALLATION ".