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

DESCRIPTION

Using this circuit, the radio receiver assembly sends power to the telephone microphone assembly, and the telephone microphone assembly sends microphone signals to the radio receiver assembly.

WIRING DIAGRAM

A01DNWZE01

INSPECTION PROCEDURE

PROCEDURE


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


    1. Disconnect the H47 radio receiver assembly connector.

    2. Disconnect the W7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H47-6 (SNS2) - W7-14 (SNS2) Always Below 1 Ω
      H47-4 (MACC) - W7-11 (MACC) Always Below 1 Ω
      H47-5 (MIN+) - W7-12 (MCO+) Always Below 1 Ω
      H47-19 (MIN-) - W7-13 (MCO-) Always Below 1 Ω
      H47-4 (MACC) - Body ground Always 10 kΩ or higher
      H47-5 (MIN+) - Body ground Always 10 kΩ or higher
      H47-19 (MIN-) - Body ground Always 10 kΩ or higher
      H47-18 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO RECEIVER ASSEMBLY


    1. A01DOJ9E12
      Text in Illustration
      *a

      Component with harness connected

      (Radio Receiver Assembly)

      Remove the radio receiver assembly with its connectors still connected Click here.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H47-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H47-18 (SGND) - Body ground Always Below 1 Ω
      H47-19 (MIN-) - Body ground Always Below 1 Ω

    NG

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

    OK

  3. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a known good one Click here.

    2. Check that the malfunction disappears.

      OK
      Malfunction disappears.

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)