NAVIGATION SYSTEM (for HDD) 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 navigation computer sub-assembly switches between the daytime screen and night screen on the multi-display according to the illumination signal input.

WIRING DIAGRAM

A003Y58E03

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 navigation computer sub-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) Light control switch in the tail or head position 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MULTI-MEDIA MODULE WIRE


    1. A003XI8E08

      Disconnect the H20 multi-media module wire connector.

    2. A003VTLE08

      Disconnect the DC1 multi-media module wire connector.

    3. 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
      Text in Illustration
      *a

      Component without harness connected

      (Multi-media Module Wire)

    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. A003VMGE02
      Text in Illustration
      *a Example

      Press the "DISP" switch on the remote touch.

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

    3. Check if "Day mode" 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 H60 navigation computer sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H60-10 (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
      H60-12 (ILL+) - H60-10 (GND1) Light control switch in the 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