Audio Communication Line Inspection

CHECK HARNESS

Turn ignition switch OFF.
Disconnect audio unit connector and display unit connector.

Check continuity between audio unit harness connector terminals and display unit harness connector terminals.

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

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

AUDIO UNIT HARNESS CONNECTOR TERMINALS AND DISPLAY UNIT HARNESS CONNECTOR TERMINALS CONTINUITY

Terminals				Continuity
Display unit (+)		Audio unit (-)
Connector	Terminal (Wire color)	Connector	Terminal (Wire color)
M62	8 (LG)	M60	23 (LG)	Yes
	10 (B/Y)		21 (B/Y)
	9		25

Check continuity between display unit harness connector terminals and ground.

Fig 2: Checking Continuity Between Display Unit Harness Connector Terminals And Ground

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

DISPLAY UNIT HARNESS CONNECTOR TERMINALS AND GROUND CONTINUITY

Terminals			Continuity
Display unit (+)		(-)
Connector	Terminal (Wire color)
M62	8 (LG)	Ground	No
	10 (B/Y)

OK or NG

OK: GO TO 2.
NG: Repair harness or connector.

CHECK AUDIO UNIT
1. Connect audio unit connector.
2. Turn ignition switch ON.
3. Check voltage between audio unit harness connector M60 terminal 23 (LG) and ground.
  
  Fig 3: Checking Voltage Between Audio Unit Harness Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  23 - Ground: Approx. 4V
OK or NG
1. OK: GO TO 3.
2. NG: Replace audio unit.
CHECK DISPLAY UNIT
1. Turn ignition switch OFF.
2. Disconnect audio unit connector, and connect display unit connector.
3. Turn ignition switch ON.
4. Check voltage between display unit harness connector M62 terminal 10 (B/Y) and ground.
  
  Fig 4: Checking Voltage Between Display Unit Harness Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  10 - Ground: Approx. 4V
OK or NG
1. OK: GO TO 4.
2. NG: Replace display unit.
CHECK AUDIO TX COMMUNICATION SIGNAL
1. Turn ignition switch OFF.
2. Connect audio unit connector.
3. Turn ignition switch ON.
4. Check signal between display unit harness connector M62 terminal 8 (LG) and ground with CONSULT-ll or oscilloscope.
  8-Ground:
  
  Fig 5: Identifying Audio TX Communication Signal
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 6: Checking Signal Between Display Unit Harness Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 5.
2. NG: Replace display unit.
CHECK AUDIO RX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check signal between display unit harness connector M62 terminal 10 (B/Y) and ground with CONSULT-II or oscilloscope.
  10-Ground:
  
  Fig 7: Identifying Audio RX Communication Signal
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 8: Checking Signal Between Display Unit Harness Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: INSPECTION END
2. NG: Replace audio unit.