NAVIGATION SYSTEM (for HDD) 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

A009AUKE11

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DISPLAY AND NAVIGATION MODULE DISPLAY


    1. A0099U1E02
      Text in Illustration
      *a

      Component without harness connected

      (Display and Navigation Module Display)

      Disconnect the H4 display and navigation module display connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H4-6 (MIN-) - Body ground Always Below 1 Ω
    3. 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 Ignition switch ACC 4.75 to 5.25 V

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


    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
      H4-4 (MACC) - W7-11 (MACC) Always Below 1 Ω
      H4-5 (MIN+) - W7-12 (MCO+) Always Below 1 Ω
      H4-6 (MIN-) - W7-13 (MCO-) Always Below 1 Ω
      H4-20 (SNS2) - W7-14 (SNS2) Always Below 1 Ω
      H4-4 (MACC) - Body ground Always 10 kΩ or higher
      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
      H4-20 (SNS2) - Body ground Always 10 kΩ or higher

    NG
    OK
  3. INSPECT MAP LIGHT ASSEMBLY


    1. A009915E02

      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
      13 (MCO-) - 14 (SNS2) Always Below 1 Ω

    NG
    OK
  4. CHECK MAP LIGHT ASSEMBLY


    1. A0098E8E02
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

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

    2. Check the waveform of the telephone microphone assembly using an oscilloscope.

      Result
      Result Proceed to
      Waveform synchronized with voice input to telephone microphone assembly is output A
      Waveform synchronized with voice input to telephone microphone assembly is not output B

    B
    A
  5. REPLACE TELEPHONE MICROPHONE WITH ANOTHER CHECK


    1. Replace the telephone microphone assembly with a normal one Click here.

    2. Check if the same problem occurs again.

      OK
      Malfunction disappears.

    NG
    OK