Diagnosis Procedure

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

1. CHECK AUX SOUND SIGNAL CIRCUIT CONTINUITY 1 
   1. Turn ignition switch OFF.
   2. Disconnect front auxiliary input jacks connector M206 and headrest display unit (passenger seat) connector B306.
   3. Check continuity between front auxiliary input jacks connector M206 terminals 1, 3 and headrest display unit (passenger seat) connector B306 terminals 4, 5.

      Front auxiliary input jacks		Headrest display unit (passenger seat)		Continuity
      Connector	Terminal	Connector	Terminal
      M206	1	B306	4	Yes
      	3		5

   4. Check continuity between front auxiliary input jacks connector M206 terminals 1, 3 and ground.

      Front auxiliary input jacks		Ground	Continuity
      Connector	Terminal
      M206	1	-	No
      	3

      Is inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace harness or connectors.

2. CHECK AUX SOUND SIGNAL CIRCUIT CONTINUITY 2 
   1. Disconnect AV control unit connector M177.
   2. Check continuity between AV control unit connector M177 terminals 38, 24 and headrest display unit (passenger seat) connector B306 terminals 14, 15.

      AV control unit		Headrest display unit (passenger seat)		Continuity
      Connector	Terminal	Connector	Terminal
      M177	38	B306	14	Yes
      	24		15

   3. Check continuity between AV control unit connector M177 terminals 38, 24 and ground.

      AV control unit		Ground	Continuity
      Connector	Terminal
      M177	38	-	No
      	241

      Is inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness or connectors.

3. CHECK AUX SOUND SIGNAL GROUND CIRCUIT CONTINUITY 1 

   Check continuity between front auxiliary input jacks connector M206 terminal 2 and headrest display unit (passenger seat) connector B306 terminal 3.

   Front auxiliary input jacks		Headrest display unit (passenger seat)		Continuity
   Connector	Terminal	Connector	Terminal
   M206	2	B306	3	Yes

   Is inspection result normal? 

   YES: GO TO 4.

   NO: Repair or replace harness or connectors.

4. CHECK AUX SOUND SIGNAL GROUND CIRCUIT CONTINUITY 2 

   Check continuity between AV control unit connector M177 terminal 39 and headrest display unit (passenger seat) connector B306 terminal 13.

   AV control unit		Headrest display unit (passenger seat)		Continuity
   Connector	Terminal	Connector	Terminal
   M177	39	B306	13	Yes

   Is inspection result normal? 

   YES: GO TO 5.

   NO: Repair or replace harness or connectors.

5. CHECK AUX SOUND SIGNAL 
   1. Connect AV control unit connector M177 and headrest display unit (passenger seat) connector B306.
   2. Turn ignition switch to ACC.
   3. Select AUX mode.
   4. Check signals between AV control unit connector M177 and ground.

      AV control unit connector M177		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      38	24	AUX mode selected
      24	39

      Is the inspection result normal? 

      YES: Replace front auxiliary input jacks. Refer to "REMOVAL AND INSTALLATION ".

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