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

1. Check system of power supply and ground circuit 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 M45 and display control unit connector M95.
3. Check continuity between audio unit and display control unit.
   CONTINUITY CHECK
   
   

   Terminals				Continuity
   Display control unit (+)		Audio unit (-)
   Connector	Terminal	Connector	Terminal
   M95	40	M45	23	Yes
   	42		21

   Fig 1: Checking Continuity Between Audio Unit Connector Terminals And Display Control Unit Connector Terminals

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between display control unit and ground.
   CONTINUITY CHECK
   
   

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

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 40 and ground.

   Approx. 3.5V or more 

OK or NG 

OK:  GO TO 4.

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

Fig 2: Checking Voltage Between Display Control Unit Harness Connector M95 Terminal 40 And Ground

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

1. Connect audio 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 

OK or NG 

OK:  GO TO 5.

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

Fig 3: Checking Voltage Between Display Control Unit Harness Connector M95 Terminal 42 And Ground

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

1. Turn ignition switch ON.
2. 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 ".

OK or NG 

OK:  GO TO 6.

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

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

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

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 ".

OK or NG 

OK:  Replace audio unit. Refer to "AUDIO UNIT ".

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

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

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