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

WARNING: This page is about a different car, the 2003 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.

DISPLAY COMMUNICATION LINE HARNESS CHECK CHART (1 OF 2)

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

Check continuity between display control unit and ground.

DISPLAY COMMUNICATION LINE HARNESS CHECK CHART (2 OF 2)

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

Fig 1: Checking Continuity Between Display Control Unit And Display And 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 control unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M43 terminal 36 (O/L) and ground.
  1. Approx. 3.5 V or more
OK or NG
1. OK : GO TO 3.
2. NG : Replace display control unit.
Fig 2: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 36 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK2: COMMUNICATION SIGNAL (DSP-DCU)
1. Connect display connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M43 terminal 38 (W/L) and ground.
  1. Approx. 3.5 V or more
OK or NG
1. OK : GO TO 4.
2. NG : Replace display unit.
Fig 3: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 38 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK3: COMMUNICATION SIGNAL (DCU-DSP)
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M43 terminal 36 (O/L) and ground with CONSULT-II or oscilloscope.
  1. 36 (O/L) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
  Fig 4: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 36 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 5.
2. NG : Replace display.
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.
  1. 38 (W/L) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ."
OK or NG
1. OK : Replace display.
2. NG : Replace display control unit.
Fig 5: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 38 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.