NAVIGATION SYSTEM Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

This circuit sends a microphone signal from the telephone microphone assembly to the radio and display receiver assembly.

It also supplies power from the radio and display receiver assembly to the telephone microphone assembly.

WIRING DIAGRAM

A01INBIE01

INSPECTION PROCEDURE

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 RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01IRZ6E27
      Text in Illustration
      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H105-19 (MIN-) - Body ground Always Below 1 Ω
      H105-18 (SGND) - 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
      H105-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY)


    1. Disconnect the H105 radio and display receiver assembly connector.

    2. Disconnect the Q10 roof console box assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H105-4 (MACC) - Q10-15 (MACC) Always Below 1 Ω
      H105-5 (MIN+) - Q10-14 (MIC+) Always Below 1 Ω
      H105-19 (MIN-) - Q10-13 (MIC-) Always Below 1 Ω
      H105-6 (SNS2) - Q10-4 (SNS2) Always Below 1 Ω
      H105-4 (MACC) - Body ground Always 10 kΩ or higher
      H105-5 (MIN+) - Body ground Always 10 kΩ or higher
      H105-19 (MIN-) - Body ground Always 10 kΩ or higher
      H105-18 (SGND) - Body ground Always 10 kΩ or higher
      H105-6 (SNS2) - Body ground Always 10 kΩ or higher

    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.

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)