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Display does not Dim when Light Control Switch is Turned ON [09/2017 - ]: Procedure

  1. CHECK SYMPTOMS 
    1. Check the symptoms that occur by viewing the display.

      Result

      Result Proceed to
      There is a delay in when the multi-display assembly dims after the navigation system is turned on with the light control switch in the tail or head position. A
      The multi-display assembly dims for a moment and then becomes bright after the navigation system is turned on with the light control switch in the tail or head position. B
      When the light control switch is in the tail or head position, the multi-display assembly dims but does not change to night mode.
      When the light control switch is in the tail or head position, the multi-display assembly neither dims nor switches to night mode. C

      HINT: 

      • When the navigation system is activated with the light control switch in the tail or head position, before AVC-LAN communication is established, the multi-display assembly dims the display according to the illumination signal received via a direct line.
      • After AVC-LAN communication is established, the multi-display assembly dims the display according to a dimmer signal sent via a direct line.
      • The radio receiver assembly changes the multi-display assembly between daytime mode and night mode according to the illumination signal input.

    Result: 

    B 

    See step  3

    Result: 

    C 

    GO TO LIGHTING SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ] 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT) 
    1. Disconnect the multi-display assembly connector.
      GTY793031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Multi-display Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I42-13 (GND1) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I42-2 (ILL) - Body ground Engine switch on (IG)
      Light control switch in tail or head position      		 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2017 - 10/2019]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK IMAGE QUALITY SETTING 
    1. Turn the light control switch to the tail or head position.
    2. Check that daytime mode on the display adjustment screen is set to on.

      Result

      Result Proceed to
      Daytime mode is set to on. A
      Daytime mode is set to off. B

    Result: 

    A 

    CHANGE DAYTIME MODE SETTING TO OFF 

    Result: 

    B 

    See step  4

  4. CHECK VEHICLE SIGNAL (OPERATION CHECK) 
    1. Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check.
      GTY325562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to OPERATION CHECK [09/2017 - 10/2019] , or refer to OPERATION CHECK [10/2019 - ]

    2. Check that the display for "TAIL" changes between ON and OFF according to the light control switch operation.

      OK

      Light Control Switch Display
      Tail or head ON
      Off or AUTO OFF

      HINT: 

      • This display is updated once per second. As a result, it is normal for the display to lag behind the actual switch operation.
      • Make sure to move the vehicle to a bright area before performing an operation check with the light control switch in the AUTO position.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2017 - 10/2019]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2019 - ] 

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT) 
    1. Disconnect the radio receiver assembly connector.
      GTY787902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Radio Receiver Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I152-1 (GND1) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I153-15 (ILL+) - Body ground Engine switch on (IG)
      Light control switch in tail or head position      		 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2017 - 10/2019]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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