NAVIGATION SYSTEM Microphone Circuit between Radio Receiver and Extension Module

DTC Code DTC Name
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

E292627E02

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 HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)

    1. Disconnect the z27 radio and display receiver assembly connector.

    2. Disconnect the z26 navigation ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      z27-5 (MIC+) - z26-16 (MIC+)

      Always

      Below 1 Ω

      z27-6 (MIC-) - z26-17 (MIC-)

      Always

      Below 1 Ω

      z27-1 (SLD4) - z26-18 (MSHLD)

      Always

      Below 1 Ω

      z27-5 (MIC+) - Body ground

      Always

      10 kΩ or higher

      z27-6 (MIC-) - Body ground

      Always

      10 kΩ or higher

      z27-1 (SLD4) - Body ground

      Always

      10 kΩ or higher

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR