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NAVIGATION SYSTEM Display does not Dim when Light Control Switch is Turned ON

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DTC Code DTC Name
  Display does not Dim when Light Control Switch is Turned ON
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DESCRIPTION

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 AVC-LAN communication.

The multi-media module receiver assembly switches between the daytime screen and night screen on the multi-display assembly according to the illumination signal input.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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PROCEDURE


  1. Click here

    CONFIRM SYMPTOMS


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

      Result
      Result Proceed to
      There is a delay until the display dims after the navigation system is activated with the light control switch in the tail or head position. A
      The display dims for a moment and then becomes bright after the navigation system is activated with the light control switch in the tail or head position. B
      When the light control switch is set to the tail or head position, the display dims but does not switch to the night screen. B
      When the light control switch is set to the tail or head position, the display neither dims nor switches to the night screen. C
      Tip:

      • 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 AVC-LAN communication.

      • The multi-media module receiver assembly switches between the daytime screen and night screen on the multi-display assembly according to the illumination signal input.


  2. Click here

    CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)


    1. Disconnect the H93 multi-display assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H93-13 (GND1) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H93-2 (ILL) - H93-13 (GND1)

      Power switch off

      Light control switch in tail or head position

      		 11 to 14 V

    • OK

      PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    CHECK IMAGE QUALITY SETTING


    1. A0004X6E01

      Display the "Display" screen.

    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
      Table 1. Text in Illustration
      *a Example

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    CHECK VEHICLE SIGNAL (OPERATION CHECK)


    1. A0007GW

      Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check (Click here).

    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
      Tip:

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


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    CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)


    1. Disconnect the H97 multi-media module receiver assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H97-12 (GND1) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H97-14 (ILL+) - H97-12 (GND1)

      Power switch off

      Light control switch in tail or head position

      		 11 to 14 V

    • OK

      PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR