Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM - WITH NAVIGATION SYSTEM ".

1. VERIFY MICROPHONE POWER AND GROUND SUPPLY

   Check power and ground supply to the microphone. Refer to "MICROPHONE: DIAGNOSIS PROCEDURE ".

   Did the power and ground supply check OK? 

   YES: GO TO 2

   NO >>

   • Check connector housings for disconnected or loose terminals.
   • Repair harness or connector.
2. CHECK HARNESS BETWEEN AV CONTROL UNIT AND MICROPHONE
   1. Turn ignition switch OFF.
   2. Disconnect AV control unit connector and microphone connector.
   3. Check continuity between AV control unit harness connector M48 (A) and microphone harness connector R8 (B).

      A		B		Continuity
      Connector	Terminal	Connector	Terminal
      M48	75	R8	1	Yes
      	74		2
      	73		4

   4. Check continuity between AV control unit harness connector M48 (A) and ground.

      A		-	Continuity
      Connector	Terminal
      M48	75	Ground	No
      	74
      	73

   Fig 1: Checking Continuity Between AV Control Unit Connector M48 (A) Terminals And Microphone Connector R8 (B) Terminals

   Courtesy of NISSAN NORTH AMERICA, INC.

   Are the continuity results as specified? 

   YES: GO TO 3

   NO: Repair harness or connector.

3. CHECK MICROPHONE SIGNAL

   Check signal between AV control unit harness connector M48 terminals 74 and 75 with CONSULT or oscilloscope.

   Connector	(+)	(-)	Reference signal
   	Terminal	Terminal
   M48	75	74	While speaking into MIC

   Fig 2: Checking Signal Between AV Control Unit Connector M48 Terminals 74 And 75 Using Oscilloscope

   Courtesy of NISSAN NORTH AMERICA, INC.

   Are voltage readings as specified? 

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

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