NAVIGATION SYSTEM (for DVD) 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).

WIRING DIAGRAM

A01NGTKE04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR


    1. A01NHNPE07

      Disconnect the display and navigation module display connector.

    2. A01NH2FE02

      Disconnect the map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G4-20 (SNS2) - T10-36 (SNS2) Always Below 1 Ω
      G4-4 (MACC) - T10-33 (MACC) Always Below 1 Ω
      G4-5 (MIN+) - T10-34 (MCO+) Always Below 1 Ω
      G4-6 (MIN-) - T10-35 (MCO-) Always Below 1 Ω
      G4-20 (SNS2) - Body ground Always 10 kΩ or higher
      G4-4 (MACC) - Body ground Always 10 kΩ or higher
      G4-5 (MIN+) - Body ground Always 10 kΩ or higher
      G4-6 (MIN-) - Body ground Always 10 kΩ or higher
      G4-7 (SGND) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Display and Navigation Module Display)
      *2

      Front view of wire harness connector

      (to Map Light Assembly)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT DISPLAY AND NAVIGATION MODULE DISPLAY


    1. Reconnect the display and navigation module display connector.

    2. A01NF2XE01
      Text in Illustration
      *1

      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 Condition Specified Condition
      G4-4 (MACC) - Body ground Power switch on (ACC) 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G4-7 (SGND) - Body ground Always Below 1 Ω
      G4-6 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. A01NHCBE01
      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
      T10-36 (SNS2) - T10-35 (MCO-) Always Below 1 Ω

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY


    1. Reconnect the G4 display and navigation module display connector.

    2. A01NEI1E01
      Text in Illustration
      *1

      Component with harness connected

      (Map Light Assembly)

      Reconnect the T10 map light assembly connector.

    3. Turn the power switch on (ACC).

    4. Connect an oscilloscope to terminals 34 (MCO+) and 35 (MCO-) of the T10 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

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

    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