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

DESCRIPTION

If the navigation system is turned on with the light control switch in the tail or head position, before AVC-LAN communication is established, the multi-display assembly*1 or accessory meter assembly*2 dims according to the illumination signal received via a direct line.

After AVC-LAN communication is established, the multi-display assembly*1 or accessory meter assembly*2 dims the display according to a dimmer signal sent via AVC-LAN communication.

The radio receiver assembly changes the multi-display assembly*1 or accessory meter assembly*2 between daytime mode and night mode according to the illumination signal input.


WIRING DIAGRAM

B005NEHE03

CAUTION / NOTICE / HINT

Note

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

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*1 or accessory meter assembly*2 dims after the navigation system is turned on with the light control switch in the tail or head position. A
      The multi-display assembly*1 or accessory meter assembly*2 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*1 or accessory meter assembly*2 dims but does not change to night mode.
      When the light control switch is in the tail or head position, the multi-display assembly*1 or accessory meter assembly*2 neither dims nor switches to night mode. 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 assembly*1 or accessory meter assembly*2 dims the display according to the illumination signal received via a direct line.

      • After AVC-LAN communication is established, the multi-display assembly*1 or accessory meter assembly*2 dims the display according to a dimmer signal sent via a direct line.

      • The radio receiver assembly changes the multi-display assembly*1 or accessory meter assembly*2 between daytime mode and night mode according to the illumination signal input.


      • *1: for 8 Inch Display

        *2: for 12.3 Inch Display


    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 J56 multi-display assembly connector (for 8 Inch Display).

      Disconnect the J137 accessory meter assembly connector (for 12.3 Inch Display).

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      J56-13 (GND1) - Body ground*1

      J137-13 (GND1) - Body ground*2

      		 Always Below 1 Ω

      • *1: for 8 Inch Display

        *2: for 12.3 Inch Display

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

      Standard Voltage
      Tester Connection Condition Specified Condition

      J56-2 (ILL) - J56-13 (GND1)*1

      J137-2 (ILL) - J137-13 (GND1)*2

      		 Light control switch in tail or head position 11 to 14 V

      • *1: for 8 Inch Display

        *2: for 12.3 Inch Display

      Result
      Proceed to
      OK
      NG

    OK

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

    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

    A

    CHANGE DAYTIME MODE SETTING TO OFF

    B

  4. CHECK VEHICLE SIGNAL (OPERATION CHECK)


    1. B005LN2

      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.

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  5. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)


    1. Disconnect the J50 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J50-12 (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
      J50-14 (ILL+) - J50-12 (GND1) Light control switch in tail or head position 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR