NAVIGATION SYSTEM (for HDD) Microphone Circuit between Microphone and Navigation ECU

DESCRIPTION

This circuit sends a microphone signal from the map light assembly (telephone microphone assembly) to the display and navigation module display.

It also supplies power from the display and navigation module display to the map light assembly (telephone microphone assembly).

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

WIRING DIAGRAM

A015ZW2E06

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR


    1. Disconnect the J122 display and navigation module display connector.

    2. Disconnect the R5 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J122-20 (SNS2) - R5-6 (SNS2) Always Below 1 Ω
      J122-4 (MACC) - R5-15 (MACC) Always Below 1 Ω
      J122-5 (MIN+) - R5-16 (MCO+) Always Below 1 Ω
      J122-6 (MIN-) - R5-17 (MCO-) Always Below 1 Ω
      J122-20 (SNS2) - Body ground Always 10 kΩ or higher
      J122-4 (MACC) - Body ground Always 10 kΩ or higher
      J122-5 (MIN+) - Body ground Always 10 kΩ or higher
      J122-6 (MIN-) - Body ground Always 10 kΩ or higher
      J122-7 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT DISPLAY AND NAVIGATION MODULE DISPLAY


    1. Disconnect the R5 map light assembly connector.

    2. A01608AE29
      Text in Illustration
      *1

      Component with harness connected

      (Display and Navigation Module Display)

      Reconnect the J122 display and navigation module display connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J122-4 (MACC) - Body ground Engine 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
      J122-7 (SGND) - Body ground Always Below 1 Ω
      J122-6 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. A015ZPSE06
      Text in Illustration
      *1

      Component without harness connected

      (Map Light Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R5-6 (SNS2) - R5-17 (MCO-) Always Below 1 Ω

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY


    1. Reconnect the J122 display and navigation module display connector.

    2. A015ZDOE06
      Text in Illustration
      *1

      Component with harness connected

      (Map Light Assembly)

      Reconnect the R5 map light assembly connector.

    3. Turn the engine switch on (ACC).

    4. Connect an oscilloscope to terminals 16 (MCO+) and 17 (MCO-) of the R5 map light assembly connector.

    5. Check the waveform of the telephone microphone 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 ASSEMBLY Click here

    A

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

  5. 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

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END