AUDIO AND VISUAL SYSTEM (for Radio Receiver Type) Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

Microphone signal from the telephone microphone assembly is sent to the radio receiver assembly. Also, power is supplied from the radio receiver assembly to the telephone microphone assembly.

WIRING DIAGRAM

A00OTUWE11

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the D129 radio receiver assembly connector.

    2. Disconnect the K7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D129-4 (MACC) - K7-12 (MACC) Always Below 1 Ω
      D129-5 (MIN+) - K7-11 (MIC+)
      D129-19 (MIN-) - K7-10 (MIC-)
      D129-6 (SNS2) - K7-3 (SNS2)
      D129-4 (MACC) - Body ground Always 10 kΩ or higher
      D129-5 (MIN+) - Body ground
      D129-19 (MIN-) - Body ground
      D129-6 (SNS2) - Body ground
      D129-18 (SGND) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO RECEIVER ASSEMBLY


    1. A00OSEPE24
      Text in Illustration
      *a

      Component with harness connected

      (Radio Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D129-18 (SGND) - Body ground Always Below 1 Ω
      D129-19 (MIN-) - Body ground

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D129-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  3. REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK


    1. Replace the telephone microphone with a normal one Click here.

    2. Check if the same problem occurs again.

      OK
      Malfunction disappears.

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)