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

E292629E02

CAUTION / NOTICE / HINT

Note:

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

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PROCEDURE

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

    1. Disconnect the Y1 radio and display receiver assembly connector.

    2. Disconnect the Y5 navigation ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Y1-5 (MIC+) - Y5-16 (MIC+)

      Always

      Below 1 Ω

      Y1-6 (MIC-) - Y5-17 (MIC-)

      Always

      Below 1 Ω

      Y1-1 (SLD4) - Y5-18 (MSHLD)

      Always

      Below 1 Ω

      Y1-5 (MIC+) - Body ground

      Always

      10 kΩ or higher

      Y1-6 (MIC-) - Body ground

      Always

      10 kΩ or higher

      Y1-1 (SLD4) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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    NG

    REPLACE NO. 1 NAVIGATION WIRE

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