AUDIO AND VISUAL SYSTEM(except Sedan Radio and Display Type) Microphone Circuit between Microphone and Radio Receiver

DTC Code DTC Name
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

E227677E23

PROCEDURE

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

    1. Disconnect the E60 radio and display receiver assembly connector.

    2. Disconnect the O8 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

      E60-6 (SNS2) - O8-5 (SNS2)

      Always

      Below 1 Ω

      E60-4 (MACC) - O8-16 (MACC)

      Always

      Below 1 Ω

      E60-5 (MIN+) - O8-15 (MIC+)

      Always

      Below 1 Ω

      E60-19 (MIN-) - O8-14 (MIC-)

      Always

      Below 1 Ω

      E60-6 (SNS2) - Body ground

      Always

      10 kΩ or higher

      E60-4 (MACC) - Body ground

      Always

      10 kΩ or higher

      E60-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      E60-19 (MIN-) - Body ground

      Always

      10 kΩ or higher

      E60-18 (SGND) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

    1. Reconnect the E60 radio and display receiver assembly connector.

    2. Reconnect the O8 map light assembly (telephone microphone assembly) connector.

    3. E176671C24

      *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

      E60-4 (MACC) - Body ground

      Ignition switch 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

      E60-18 (SGND) - Body ground

      Always

      Below 1 Ω

      E60-19 (MIN-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

    1. Reconnect the E60 radio and display receiver assembly connector.

    2. Reconnect the O8 map light assembly (telephone microphone assembly) connector.

    3. Turn the ignition switch to ACC.

    4. E234303C01

      *a

      Component with harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

      Connect an oscilloscope to terminals 15 (MIC+) and 14 (MIC-) of the 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

  4. REPLACE TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the telephone microphone assembly.

      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