AUDIO AND VISUAL SYSTEM(for 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 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 telephone microphone assembly, and the telephone microphone assembly sends microphone signals to the radio and display receiver assembly.

WIRING DIAGRAM

E273268E11

PROCEDURE

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

    1. Disconnect the H105 radio and display receiver assembly connector.

    2. Disconnect the Q10 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H105-6 (SNS2) - Q10-4 (SNS2)

      Always

      Below 1 Ω

      H105-4 (MACC) - Q10-15 (MACC)

      H105-5 (MIN+) - Q10-14 (MIC+)

      H105-19 (MIN-) - Q10-13 (MIC-)

      H105-6 (SNS2) - Body ground

      Always

      10 kΩ or higher

      H105-4 (MACC) - Body ground

      H105-5 (MIN+) - Body ground

      H105-19 (MIN-) - Body ground

      H105-18 (SGND) - Body ground

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  2. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

    1. U124003E02

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      H105-4 (MACC) - Body ground

      Ignition switch ACC

      4 to 6 V

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H105-18 (SGND) - Body ground

      Always

      Below 1 Ω

      H105-19 (MIN-) - Body ground
    Table 1. Text in Illustration

    *a

    Component with harness connected

    (Radio and Display Receiver Assembly)

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    (Click here)

  3. INSPECT MAP LIGHT ASSEMBLY

    1. E267338E06

      Remove the map light assembly (Click here).

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      4 (SNS2) - 13 (MIC-)

      Always

      Below 1 Ω

    CHECK TELEPHONE MICROPHONE ASSEMBLYClick here

  4. CHECK MAP LIGHT ASSEMBLY

    1. U124015E02

      Turn the ignition switch to ACC.

    2. Connect an oscilloscope to terminals 14 (MIC+) and 13 (MIC-).

    3. Check the waveform of the map light assembly using the oscilloscope.

      Table 2. Text in Illustration

      *a

      Component with harness connected

      (Map Light Assembly)
      Table 3. Result

      Result

      Proceed to

      A waveform synchronized with the voice input to the map light assembly is output

      A

      A waveform synchronized with the voice input to the map light assembly is not output

      B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

  5. CHECK TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the telephone microphone assembly with a new or normally functioning one (Click here).

    2. Check if the same problem occurs again.

      Table 4. Result

      Result

      Proceed to

      Malfunction disappears

      A

      Malfunction does not disappear

      B

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    REPLACE MAP LIGHT ASSEMBLY

    (Click here)