NAVIGATION SYSTEM Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

The radio and display receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

Using this circuit, the radio and display receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the radio and display receiver assembly.

WIRING DIAGRAM

A01MHPEE61
*a (Shielded)
*b Map Light Assembly (Telephone Microphone Assembly)
*c Radio and Display Receiver Assembly

PROCEDURE


  1. CHECK MICROPHONE (OPERATION CHECK)


    1. A01MJC3

      Enter the "Microphone Check" screen. Refer to Check Microphone in Operation Check.

      Click here

    2. When a voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

      OK
      Check result is normal.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))


    1. Disconnect the G105 radio and display receiver assembly connector.

    2. Disconnect the W8 map light assembly (telephone microphone assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G105-6 (SNS2) - W8-15 (SNS2) Always Below 1 Ω
      G105-4 (MACC) - W8-22 (MACC) Always Below 1 Ω
      G105-5 (MIN+) - W8-21 (MCO+) Always Below 1 Ω
      G105-19 (MIN-) - W8-20 (MCO-) Always Below 1 Ω
      G105-6 (SNS2) - Body ground Always 10 kΩ or higher
      G105-4 (MACC) - Body ground Always 10 kΩ or higher
      G105-5 (MIN+) - Body ground Always 10 kΩ or higher
      G105-19 (MIN-) - Body ground Always 10 kΩ or higher
      G105-18 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Reconnect the G105 radio and display receiver assembly connector.

    2. Reconnect the W8 map light assembly (telephone microphone assembly) connector.

    3. A01MJ9XC02
      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G105-4 (MACC) - Body ground Power switch on (ACC) 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G105-18 (SGND) - Body ground Always Below 1 Ω
      G105-19 (MIN-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. Remove the map light assembly (telephone microphone assembly).

      Click here

    2. A01MI0EC01
      *a

      Component without harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      15 (SNS2) - 20 (MCO-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 6 Click here

    OK

  5. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. Reconnect the G105 radio and display receiver assembly connector.

    2. Reconnect the W8 map light assembly (telephone microphone assembly) connector.

    3. Turn the power switch on (ACC).

    4. A01MG4DC01
      *a

      Component with harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

      Connect an oscilloscope to terminals 21 (MCO+) and 20 (MCO-) of the W8 map light assembly (telephone microphone assembly) connector.

    5. Check the waveform of the map light assembly (telephone microphone assembly) using the oscilloscope.

      Result
      Result Proceed to
      A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is output. A
      A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is not output. B

    A

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

    B

  6. REPLACE TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or known good one.

      Click here

    2. Check if the same malfunction recurs.

      Result
      Result Proceed to
      Malfunction does not recur (returns to normal). A
      Malfunction recurs. B

    A

    END

    B

    REPLACE MAP LIGHT ASSEMBLY Click here