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

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS

Turn ignition switch OFF.
Disconnect display unit connector M93 and display control unit connector M95.

Check continuity between display control unit and display unit.

DISPLAY CONTROL UNIT AND DISPLAY UNIT

Terminals				Continuity
Display control unit (+)		Display unit (-)
Connector	Terminal	Connector	Terminal
M95	36	M93	11	Yes
M95	38	M93	22	Yes

Check continuity between display control unit and ground.

DISPLAY CONTROL UNIT AND GROUND

Terminals			Continuity
Display control unit (+)		(-)
Connector	Terminal	(-)
M95	36	Ground	No
M95	38	Ground	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.

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 and ground.
  Approx. 3.5V or more
Fig 2: Checking Signal Between Display Control Unit Connector M95 Terminal 36 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 3.

NG: Replace display control unit. Refer to "DISPLAY CONTROL UNIT ".
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 and ground.
  Approx. 3.5V or more
Fig 3: Checking Voltage Between Display Control Unit Harness Connector M95 Terminal 38 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Replace display unit. Refer to "DISPLAY UNIT ".
CHECK 3: COMMUNICATION SIGNAL (DCU-DSP)
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M95 terminal 36 and ground with CONSULT-III or oscilloscope.
  36 - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
Fig 4: Checking Signal Between Display Control Unit Harness Connector M95 Terminal 36 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 5.

NG: Replace display unit. Refer to "DISPLAY UNIT ".
CHECK 4: COMMUNICATION SIGNAL (DSP-DCU)
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M95 terminal 38 and ground with CONSULT-III or oscilloscope.
  38 - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
Fig 5: Checking Signal Between Display Control Unit Connector M95 Terminal 38 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: Replace display unit. Refer to "DISPLAY UNIT ".

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