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

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS

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

Check continuity between display control unit and Display.

CONTINUITY CHECK CHART

Terminals				Continuity
Display control unit		Display
Connector	Terminal (Wire color)	Connector	Terminal (Wire color)
M43	36 (O/L)	M38	11 (O/L)	Yes
M43	38 (W/L)	M38	22 (W/L)	Yes

Check continuity between display control unit and ground.

CONTINUITY CHECK CHART

Terminals
	Display control unit		Ground
Connector	Terminal (Wire color)
M43	36 (O/L)	No
M43	38 (W/L)	No

Fig 1: Checking Continuity Between Display Control Unit And Ground

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

OK or NG

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

CHECK1: COMMUNICATION SIGNAL (DCU-DSP)
1. Connect display connector.
2. Turn ignition switch ON.
3. Check voltage between display harness connector M38 terminal 11 (O/L) and ground.
  Approx. 4V
  
  Fig 2: Checking Voltage Between Display Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Replace display.
CHECK2: COMMUNICATION SIGNAL (DSP-DCU)
1. Turn ignition switch OFF
2. Disconnect display connector, and connect display control unit connector.
3. Turn ignition switch ON.
4. Check voltage between display control unit harness connector M43 terminal 38 (W/L) and ground.
  Approx. 4V
  
  Fig 3: Checking Voltage Between Display Control Unit Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Replace display control unit.
CHECK3: COMMUNICATION SIGNAL (DCU-DSP)
1. Turn ignition switch OFF.
2. Connect display connector.
3. Turn ignition switch ON.
4. Check signal between display control unit harness connector M43 terminal 36 (O/L) and ground with CONSULT-II or oscilloscope.
  36 (O/L) - Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
  
  Fig 4: Checking Signal Between Display Control Unit Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 5.
2. NG: Replace display control unit.
CHECK4: COMMUNICATION SIGNAL (DSP-DCU)
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M43 terminal 38 (W/L) and ground with CONSULT-II or oscilloscope.
  38 (W/L) - Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
  
  Fig 5: Checking Signal Between Display Control Unit Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 6.
2. NG: Replace display.
CHECK SELF-DIAGNOSIS OF DCU
1. Turn ignition switch OFF.
2. Replace display control unit.
3. Turn ignition switch ON.
4. Start self-diagnosis of DCU, and check the self-diagnosis result.
OK or NG
1. OK: INSPECTION END.
2. NG: Replace display.