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

DTC Code DTC Name
Microphone Circuit between Microphone and Navigation ECU

DESCRIPTION

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

It also supplies power from the display and navigation module display to the telephone microphone assembly.

WIRING DIAGRAM

E205540E01

PROCEDURE

  1. INSPECT DISPLAY AND NAVIGATION MODULE DISPLAY

    1. E198672C01

      *a

      Component with harness connected

      (Display and Navigation Module Display)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H4-7 (SGND) - Body ground

      Always

      Below 1 Ω

      H4-6 (MIN-) - Body ground

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY

    Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - MAP LIGHT ASSEMBLY)

    1. Disconnect the H4 display and navigation module display connector.

    2. Disconnect the W7 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H4-5 (MIN+) - W7-12 (MCO+)

      Always

      Below 1 Ω

      H4-6 (MIN-) - W7-13 (MCO-)

      Always

      Below 1 Ω

      H4-4 (MACC) - W7-11 (MACC)

      Always

      Below 1 Ω

      H4-20 (SNS2) - W7-14 (SNS2)

      Always

      Below 1 Ω

      H4-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      H4-6 (MIN-) - Body ground

      Always

      10 kΩ or higher

      H4-7 (SGND) - Body ground

      Always

      10 kΩ or higher

      H4-4 (MACC) - Body ground

      Always

      10 kΩ or higher

      H4-20 (SNS2) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK DISPLAY AND NAVIGATION MODULE DISPLAY

    1. E198672C02

      *a

      Component with harness connected

      (Display and Navigation module Display)

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      H4-4 (MACC) - Body ground

      Engine switch on (ACC)

      4 to 6 V

      Result

      Result

      OK

      NG
    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY

    Click here

    OK

  4. INSPECT MAP LAMP ASSEMBLY

    1. E140936C02

      *a

      Component without harness connected

      (Map Light Assembly)

      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

      14 (SNS2) - 13 (MCO-)

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLYClick here

    OK

  5. CHECK MAP LIGHT ASSEMBLY

    1. E205727C01

      *a

      Component with harness connected

      (Map Light Assembly)

      Connect an oscilloscope to terminals W7-12 (MCO+) and W7-13 (MCO-) of the telephone microphone assembly connector.

    2. Turn the engine switch on (ACC).

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

      Result

      Result

      Proceed to

      Waveform synchronized with the voice input to the map light assembly is output

      A

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

      B
    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    B

    REPLACE MAP LIGHT ASSEMBLY

    Click here

  6. 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 TELEPHONE MICROPHONE ASSEMBLY

    Click here