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Display does not Dim when Light Control Switch is Turned ON: Procedure

  1. CHECK IMAGE QUALITY SETTING 
    1. Display the "Display" screen.
      Fig 1: Screen Display - Day Mode
      GTY319642Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the light control switch to the tail or head position.
    3. Check if "Day Mode" setting on the display adjustment screen is on.

      Result

      Result Proceed to
      "Day Mode" setting is on A
      "Day Mode" setting is off B
      TEXT IN ILLUSTRATION

      *a Example

    B → See step   2 

    A → TURN "Day Mode" SETTING OFF 

  2. CHECK VEHICLE SIGNAL (OPERATION CHECK) 
    1. Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check. Refer to OPERATION CHECK .
      Fig 2: Screen Display - Vehicle Signal Check Mode
      GTY321742Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the display changes between ON and OFF according to the light control switch operation.

      OK

      Light Control Switch Display
      Tail or head ON
      Off OFF

      HINT: 

      The display is updated once per second. It is normal for the display to lag behind the actual switch operation.

    NG → See step   3 

    OK → See step   4 

  3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  4. REPLACE NAVIGATION ECU SUB-ASSEMBLY. Refer to  REMOVAL