NAVIGATION SYSTEM Microphone Circuit between Radio Receiver and Extension Module

DESCRIPTION

This circuit sends a microphone voice signal from the navigation ECU to the radio and display receiver assembly.

Using this circuit, the navigation ECU disables the microphone function of the radio and display receiver assembly to receive a microphone voice signal from the telephone microphone assembly.

WIRING DIAGRAM

A01MHLSE01

PROCEDURE


  1. CHECK NO. 1 NAVIGATION WIRE


    1. Disconnect the T2 radio and display receiver assembly connector.

    2. Disconnect the T3 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T2-5 (MIC+) - T3-16 (MIC+) Always Below 1 Ω
      T2-6 (MIC-) - T3-17 (MIC-) Always Below 1 Ω
      T2-1 (SLD4) - T3-18 (MSHLD) Always Below 1 Ω
      T2-5 (MIC+) - Body ground Always 10 kΩ or higher
      T2-6 (MIC-) - Body ground Always 10 kΩ or higher
      T2-1 (SLD4) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPLACE NO. 1 NAVIGATION WIRE Click here