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

DESCRIPTION

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

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

WIRING DIAGRAM

A01IRGHE04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK RADIO RECEIVER ASSEMBLY


    1. A01IU00E02
      Text in Illustration
      *1

      Component without harness connected

      (Radio Receiver Assembly)

      Disconnect the H39 radio receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H39-1 (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
      H39-3 (MACC) - Body ground Ignition switch ACC 4.75 to 5.25 V

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

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


    1. A01IT39E02
      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 H39 radio receiver connector.

    2. Disconnect the Q7 map light connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H39-3 (MACC) - Q7-12 (MACC) Always Below 1 Ω
      H39-2 (MIN+) - Q7-11 (MIC+)
      H39-5 (MIN-) - Q7-10 (MIC-)
      H39-1 (SNS2) - Q7-3 (SNS2)
      H39-3 (MACC) - Body ground Always 10 kΩ or higher
      H39-2 (MIN+) - Body ground
      H39-5 (MIN-) - Body ground
      H39-1 (SNS2) - Body ground
      H39-6 (SGND) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    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 IS FAULTY)