Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT 

   Check display unit power supply and ground circuits. Refer to "DISPLAY UNIT: DIAGNOSIS PROCEDURE ".

   Is the inspection result normal? 

   YES: GO TO 2.

   NO: Repair or replace harness or connectors.

2. CHECK COMMUNICATION CIRCUIT CONTINUITY 
   1. Turn ignition switch OFF.
   2. Disconnect display unit connector M92 and AV control unit connector M124.
   3. Check continuity between display unit connector M92 terminals 9, 10 and AV control unit connector M124 terminals 77, 61.

      Display unit		AV control unit		Continuity
      Connector	Terminals	Connector	Terminals
      M92	9	M124	77	Yes
      	10		61

   4. Check continuity between display unit connector M92 terminals 9, 10 and ground.

      Display unit		Ground	Continuity
      Connector	Terminals
      M92	9	-	No
      	10

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness or connectors.

3. CHECK COMMUNICATION SIGNAL (DISP→CONT) 
   1. Connect display unit connector M92 and AV control unit connector M124.
   2. Turn ignition switch ON.
   3. Check signal between display unit connector M92 terminal 9 and ground.

      Display unit		Ground	Condition	Reference value
      (+)		(-)
      Connector	Terminal
      M92	9	-	When adjusting display brightness.

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION - AV CONTROL UNIT ".

4. CHECK COMMUNICATION SIGNAL (CONT→DISP) 

   Check signal between display unit connector M92 terminal 10 and ground.

   Display unit		Ground	Condition	Reference value
   (+)		(-)
   Connector	Terminal
   M92	10	-	When adjusting display brightness.

   Is the inspection result normal? 

   YES: Inspection End.

   NO: Replace display unit. Refer to "REMOVAL AND INSTALLATION ".