AUDIO AND VISUAL SYSTEM(for 12.3 Inch Display) Visual Mute Signal Circuit between Radio Receiver and Multi-display

DESCRIPTION

The radio receiver assembly sends a visual mute signal to the accessory meter assembly. As a result, a black screen is displayed when the screen changes so that noise and distorted images are not displayed.

When an open exists in the circuit, noise and distorted images will be displayed instead of a black screen.

When a short exists in the circuit, even though the accessory meter assembly is operating normally, noise and distorted images will be displayed (black screen will not be displayed) during screen changes or the black screen will always be displayed.

WIRING DIAGRAM

B005OVVE04
*1 VMTI
*2 VMTF
*3 Accessory Meter Assembly
*4 Radio Receiver Assembly

PROCEDURE


  1. INSPECT ACCESSORY METER ASSEMBLY


    1. B005MS0C46
      *a

      Component with harness connected

      (Accessory Meter Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J137-11 (VMTI) - Body ground Engine switch on (ACC), screen display changing

      3.5 V or higher

      → Below 1 V

      → 3.5 V or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - ACCESSORY METER ASSEMBLY)


    1. Disconnect the J137 accessory meter assembly connector.

    2. Disconnect the J50 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J50-10 (VMTF) - J137-11 (VMTI) Always Below 1 Ω
      J50-10 (VMTF) or J137-11 (VMTI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE ACCESSORY METER ASSEMBLY


    1. Replace the accessory meter assembly with a new or known good one.

      Click here

    2. Check that the screen display is normal.

      OK
      Screen display is normal.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here