NAVIGATION SYSTEM 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

A01IR7OE02

INSPECTION PROCEDURE

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 Q7 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) - Q7-3 (SNS2) Always Below 1 Ω
      H105-4 (MACC) - Q7-12 (MACC)
      H105-5 (MIN+) - Q7-11 (MIC+)
      H105-19 (MIN-) - Q7-10 (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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01ITRVE04
      Text in Illustration
      *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 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

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. A01IOSSE07

      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
      3 (SNS2) - 10 (MIC-) Always Below 1 Ω

    NG

    REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK Click here

    OK

  4. CHECK MAP LIGHT ASSEMBLY


    1. A01IUAQE10
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Turn the ignition switch to ACC.

    2. Connect an oscilloscope to terminals 11 (MIC+) and 10 (MIC-).

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

      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

    B

    REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK Click here

    A

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

  5. 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.

      Result
      Result Proceed to
      Malfunction disappears A
      Malfunction does not disappear B

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)