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

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.

CONNECTOR TERMINALS REFERENCE CHART

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.

CONNECTOR TERMINALS REFERENCE CHART

Terminals			Continuity
Display control unit		-
Connector	Terminal	-
M95	36	Ground	No
M95	38	Ground	No

Fig 1: Checking Continuity Between Display Control Unit And Display Unit

OK or NG

OK: GO TO 2.

NG: Repair harness or connector.

CHECK 1: COMMUNICATION SIGNAL (DCU-DSP)
1. Connect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display unit harness connector M93 terminal 11 and ground.
  Approx. 3.5V or more.
  
  Fig 2: Checking Voltage Between Display Unit Connector M93 Terminal 11 And Ground
OK or NG

OK: GO TO 3.

NG: Replace display unit. Refer to "DISPLAY UNIT "
CHECK 2: COMMUNICATION SIGNAL (DSP-DCU)
1. Turn ignition switch OFF.
2. Connect display control unit connector M95.
3. Turn ignition switch ON.
4. Check voltage between display control unit harness connector M95 terminal 38 and ground.
  Approx. 3.5V or more.
  
  Fig 3: Checking Signal Between Display Control Unit Connector M95 Terminal 38 And Ground
OK or NG

OK: GO TO 4.

NG: Replace display control unit. Refer to "DISPLAY CONTROL UNIT ".
CHECK 3: COMMUNICATION SIGNAL (DCU-DSP)
Check signal between display control unit harness connector M95 terminal 36 and ground with CONSULT-II or oscilloscope.

36 - Ground : Refer to "TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".

Fig 4: Checking Signal Between Display Control Unit Connector M95 Terminal 36 And Ground

OK or NG

OK: GO TO 5.

NG: Replace display control unit. Refer to "DISPLAY CONTROL UNIT ".
CHECK 4: COMMUNICATION SIGNAL (DSP-DCU)
Check signal between display control unit harness connector M95 terminal 38 and ground with CONSULT-II 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

OK or NG

OK: Inspection End.

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