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

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 dims the display according to the illumination signal received via a direct line.

After AVC-LAN communication is established, the multi-display 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 according to the illumination signal input.

WIRING DIAGRAM

A003V93E02

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. 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

      Tech Tips


      • 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 dims the display according to the illumination signal received via a direct line.

      • After AVC-LAN communication is established, the multi-display 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 according to the illumination signal input.


    B

    CHECK IMAGE QUALITY SETTING Click here

    C

    GO TO LIGHTING SYSTEM Click here

    A

  2. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)


    1. Disconnect the H20 multi-media module wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H20-6 (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
      H20-4 (ILL) - H20-6 (GND1)

      Power switch off

      Light control switch in tail or head position

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MULTI-MEDIA MODULE WIRE


    1. Remove the multi-media module wire.

    2. A003WQCE02
      Text in Illustration
      *a

      Component without harness connected

      (Multi-media Module Wire)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H20-4 (ILL) - DC1-2 (ILL) Always Below 1 Ω
      H20-6 (GND1) - DC1-13 (GND1) Always Below 1 Ω

    NG

    REPLACE MULTI-MEDIA MODULE WIRE Click here

    OK

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

  4. CHECK IMAGE QUALITY SETTING


    1. Display the "Display" screen.

    2. Turn the light control switch to the tail position.

    3. A003VC5E01
      Text in Illustration
      *a Example

      Check if "Day Mode" setting on the display adjustment screen is on.

      Result
      Result Proceed to
      "Day Mode" is on A
      "Day Mode" is off B

    B

    CHECK VEHICLE SIGNAL (ILLUMINATION SIGNAL) Click here

    A

    TURN "Day Mode" SETTING OFF

  5. CHECK VEHICLE SIGNAL (ILLUMINATION SIGNAL)


    1. A003YPH

      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

      Tech Tips

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


    NG

    CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL) Click here

    OK

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

  6. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)


    1. Disconnect the H147 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
      H147-12 (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
      H147-14 (ILL+) - H147-12 (GND1)

      Power switch off

      Light control switch in tail or head position

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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