AUDIO AND VISUAL SYSTEM(w/ Parallel Parking Assist Function) Display does not Dim when Light Control Switch is Turned ON

DESCRIPTION

When the audio and visual 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 an AVC-LAN communication.

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

WIRING DIAGRAM

A0020LTE04

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following 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 audio and visual 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 audio and visual 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.
      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 audio and visual 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 an AVC-LAN communication.

      • The radio receiver assembly switches between the daytime screen and night screen on the multi-display assembly 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 K61 multi-display assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K61-13 (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
      K61-2 (ILL) - K61-13 (GND1)

      Power switch off

      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

  3. CHECK IMAGE QUALITY SETTING


    1. Turn the light control switch to the tail or head position.

    2. Check that the daytime screen on the display adjustment screen is set to on.

      Result
      Result Proceed to
      Daytime screen is set to on. A
      Daytime screen is set to off. B

    A

    CHANGE DAYTIME SCREEN SETTING TO OFF

    B

  4. CHECK VEHICLE SIGNAL (OPERATION CHECK)


    1. A0020DU

      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 K58 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K58-12 (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
      K58-14 (ILL+) - K58-12 (GND1)

      Power switch off

      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