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

CHECK HARNESS

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

Check continuity between display control unit and display unit.

TERMINALS CONTINUITY REFERENCE

Terminals				Continuity
Display control unit (+)		Display unit (-)
Connector	Terminal (Wire color)	Connector	Terminal (Wire color)
M95	36(B/W)	M93	11(B/W)	Yes
	38(L)		22 (L)

Check continuity between display control unit and ground.

TERMINALS CONTINUITY REFERENCE

Terminals			Continuity
Display control unit (+)		(-)
Connector	Terminal (Wire color)
M95	36(B/W)	Ground	No
	38(L)

OK or NG

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

Fig 1: Checking Continuity Between Display Control Unit & Ground

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

CHECK 1: COMMUNICATION SIGNAL (DCU-DSP)
1. Connect display control unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M95 terminal 36 (B/W) and ground.
  1. Approx. 3.5 V or more
OK or NG
1. OK: GO TO 3.
2. NG: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF NAVI CONTROL UNIT .
Fig 2: Checking Voltage Between Display Control Unit Harness Connector Terminal & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK 2: COMMUNICATION SIGNAL (DSP-DCU)
1. Connect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M95 terminal 38 (L) and ground.
  1. Approx. 3.5 V or more
OK or NG
1. OK: GO TO 4.
2. NG: Replace display unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY UNIT ".
Fig 3: Checking Voltage Between Display Control Unit Harness Connector Terminal & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK 3: COMMUNICATION SIGNAL (DCU-DSP)
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M95 terminal 36 (B/W) and ground with CONSULT-II or oscilloscope.
  1. 36 (B/W) - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
OK or NG
1. OK: GO TO 5.
2. NG: Replace display unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY UNIT ".
Fig 4: Checking Signal Between Display Control Unit Harness Connector Terminal & Ground With CONSULT-II Or Oscilloscope
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK 4: COMMUNICATION SIGNAL (DSP-DCU)
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M95 terminal 38 (L) and ground with CONSULT-II or oscilloscope.
  1. 38 (L) - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
OK or NG
1. OK: Replace display unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY UNIT ".
2. NG: Replace display control unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT ".
Fig 5: Checking Signal Between Display Control Unit Harness Connector Terminal & Ground With CONSULT-II Or Oscilloscope
Courtesy of NISSAN MOTOR CO., U.S.A.