NAVIGATION SYSTEM(for Navigation Receiver Type) Microphone Circuit between Microphone and Navigation Receiver Assembly

DESCRIPTION

The navigation receiver assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.

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

WIRING DIAGRAM

A003ONQE06
*a (Shielded)
*b Telephone Microphone Assembly
*c Navigation Receiver Assembly

PROCEDURE


  1. CHECK MICROPHONE (OPERATION CHECK)


    1. A003P08

      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.

    3. Push the recording switch and perform voice recording.

      Tech Tips


      • Push the recording switch with the blower motor of the air conditioning system stopped. If an outlet of the air conditioning system is facing the microphone, noise may be recorded.

      • Voice can be recorded for up to 5 seconds.

    4. Check that the recording indicator remains on while recording and that the recorded voice is played normally without noise or distortion.

      OK
      All check results are normal.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY)


    1. Disconnect the I33 navigation receiver assembly connector.

    2. Disconnect the O2 telephone microphone assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I33-4 (MACC) - O2-1 (MACC) Always Below 1 Ω
      I33-5 (MIN+) - O2-2 (MCO+) Always Below 1 Ω
      I33-19 (MIN-) - O2-4 (MCO-) Always Below 1 Ω
      I33-6 (SNS2) - O2-3 (SNS2) Always Below 1 Ω
      I33-4 (MACC) or O2-1 (MACC) - Body ground Always 10 kΩ or higher
      I33-5 (MIN+) or O2-2 (MCO+) - Body ground Always 10 kΩ or higher
      I33-19 (MIN-) or O2-4 (MCO-) - Body ground Always 10 kΩ or higher
      I33-18 (SGND) - Body ground Always 10 kΩ or higher
      I33-6 (SNS2) or O2-3 (SNS2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT NAVIGATION RECEIVER ASSEMBLY


    1. A003LFZC57
      *a

      Component with harness connected

      (Navigation Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I33-4 (MACC) - Body ground Power switch on (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
      I33-18 (SGND) - Body ground Always Below 1 Ω
      I33-19 (MIN-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

    OK

  4. INSPECT TELEPHONE MICROPHONE ASSEMBLY


    1. Remove the telephone microphone assembly.

      Click here

    2. A003M2EC03
      *a

      Component without harness connected

      (Telephone Microphone Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (SNS2) - 4 (MCO-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  5. INSPECT TELEPHONE MICROPHONE ASSEMBLY


    1. Turn the power switch on (ACC).

    2. A003NDWC04
      *a

      Component with harness connected

      (Telephone Microphone Assembly)

      Connect an oscilloscope to terminals 2 (MCO+) and 4 (MCO-) of the O2 telephone microphone assembly connector.

    3. Check the waveform of the telephone microphone assembly using the oscilloscope.

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

    A

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

    B

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here