Audio Communication Line Check (Between Display Control Unit and Audio Unit)

Check system of power supply and ground circuit for audio unit. Refer to , "POWER SUPPLY CIRCUIT INSPECTION ".

OK or NG 

OK: GO TO 2.

NG: Check the malfunctioning parts.

1. Turn ignition switch OFF.
2. Disconnect audio unit connector and display control unit connector.
3. Check continuity between audio unit and display control unit.
   AUDIO UNIT AND DISPLAY CONTROL UNIT
   
   

   Terminals				Continuity
   Display control unit (+)		Audio unit (-)
   Connector	Terminal	Connector	Terminal
   M95	40	M45	65	Yes
   	42		66

4. Check continuity between display control unit and ground.
   DISPLAY CONTROL UNIT AND GROUND
   
   

   Terminals			Continuity
   Display control unit(+)		(-)
   Connector	Terminal
   M95	40	Ground	No
   	42

Fig 1: Checking Continuity Between Audio Unit & Display Control Unit And Display Control Unit & Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 3.

NG: Repair harness or connector.

1. Connect display control unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M95 terminal 42 and ground.

   Approx. 3.5V or more. 

Fig 2: Checking Voltage Between Display Control Unit Connector M95 Terminal 42 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 4.

NG: Replace display control unit. Refer to DISPLAY CONTROL UNIT  .

1. Turn ignition switch OFF.
2. Disconnect display control unit connector.
3. Connect audio unit connector.
4. Turn ignition switch ON.
5. Check voltage between audio unit harness connector M45 terminal 65 and ground.

   Approx. 3.5V or more. 

Fig 3: Checking Voltage Between Audio Unit Connector M45 Terminal 65 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 5.

NG: Replace audio unit. Refer to , "AUDIO UNIT ".

1. Turn ignition switch OFF.
2. Connect display control unit connector.
3. Turn ignition switch ON.
4. Check signal between display control unit harness connector M95 terminal 40 and ground with CONSULT-II or oscilloscope.

   40 - Ground: Refer to , " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT  ". 

Fig 4: Checking Signal Between Display Control Unit Connector M95 Terminal 40 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 6.

NG: Replace display control unit. Refer to DISPLAY CONTROL UNIT  .

1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M95 terminal 42 and ground with CONSULT-II or oscilloscope.

   42 - Ground: Refer to , " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT  ". 

Fig 5: Checking Signal Between Display Control Unit Connector M95 Terminal 42 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: Inspection End.

NG: Replace audio unit. Refer to , "AUDIO UNIT ".