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

A004TP0E05
*a Radio and Display Receiver Assembly
*b No. 1 Navigation Wire
*c Navigation ECU

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 NO. 1 NAVIGATION WIRE (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)


    1. Disconnect the z20 radio and display receiver assembly connector.

    2. Disconnect the z22 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z20-5 (MIC+) - z22-16 (MIC+) Always Below 1 Ω
      z20-6 (MIC-) - z22-17 (MIC-) Always Below 1 Ω
      z20-1 (SLD4) - z22-18 (MSHLD) Always Below 1 Ω
      z20-5 (MIC+) - Body ground Always 10 kΩ or higher
      z20-6 (MIC-) - Body ground Always 10 kΩ or higher
      z20-1 (SLD4) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPLACE NO. 1 NAVIGATION WIRE Click here