AUDIO AND VISUAL SYSTEM Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

This circuit sends a microphone signal from the microphone amplifier assembly to the radio receiver assembly.

It also supplies power from the radio receiver assembly to the telephone microphone assembly.

WIRING DIAGRAM

A003D2NE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. A003E8PE01
      Text in Illustration
      *1

      Component without harness connected

      (Radio Receiver Assembly)

      Disconnect the D58 radio receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (SNS2) - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3 (MACC) - Body ground Ignition switch ON 4.75 to 5.25 V

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

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


    1. A003EKYE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Radio Receiver Assembly)
      *2

      Front view of wire harness connector

      (to Map Light Assembly)

      Disconnect the D58 radio receiver connector.

    2. Disconnect the K7 map light connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D58-3 (MACC) - K7-12 (MACC) Always Below 1 Ω
      D58-2 (MIN+) - K7-11 (MIC+)
      D58-5 (MIN-) - K7-10 (MIC-)
      D58-1 (SNS2) - K7-3 (SNS2)
      D58-3 (MACC) - Body ground Always 10 kΩ or higher
      D58-2 (MIN+) - Body ground
      D58-5 (MIN-) - Body ground
      D58-1 (SNS2) - Body ground
      D58-6 (SGND) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE 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.
      Result
      Result Proceed to
      OK A
      NG (for Sedan) B
      NG (for Wagon) C

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    C

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END (MICROPHONE IS FAULTY)