NAVIGATION SYSTEM Microphone Circuit between Microphone and Navigation Receiver Assembly

DESCRIPTION

This circuit sends a microphone signal from the telephone microphone assembly to the navigation receiver assembly.

It also supplies power from the navigation receiver assembly to the telephone microphone assembly.

WIRING DIAGRAM

B0025ULE05

CAUTION / NOTICE / HINT

Note

Check that the wire harness is properly installed and does not have any sharp bends, pinching or loose connections.

Click here

PROCEDURE


  1. CHECK NAVIGATION RECEIVER ASSEMBLY


    1. B0025G3C15
      *a

      Component with harness connected

      (Navigation Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G113-18 (SGND) - Body ground Always Below 1 Ω
      G113-19 (MIN-) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G113-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the G113 navigation receiver assembly connector.

    2. Disconnect the Q3 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G113-5 (MIN+) - Q3-14 (MCO+) Always Below 1 Ω
      G113-19 (MIN-) - Q3-13 (MCO-) Always Below 1 Ω
      G113-4 (MACC) - Q3-15 (MACC) Always Below 1 Ω
      G113-5 (MIN+) - Body ground Always 10 kΩ or higher
      G113-19 (MIN-) - Body ground Always 10 kΩ or higher
      G113-4 (MACC) - Body ground Always 10 kΩ or higher
      G113-18 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a known good one.

      Click here

    2. Check if the same problem occurs again.

      OK
      Malfunction disappears.
      Result
      Proceed to
      OK
      NG

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here