NAVIGATION SYSTEM Mute Signal Circuit between Radio Receiver and Extension Module

DESCRIPTION

This circuit sends a signal to the extension module to mute noise. Because of that, the noise produced by changing the sound source ceases.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.

If there is a short in the circuit, even though the extension module is functioning, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM

A00OMTRE04

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT EXTENSION MODULE


    1. A00OMMNE11
      Text in Illustration
      *a

      Component with harness connected

      (Extension Module)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      z17-1 (MUTE) - Body ground

      Ignition switch ACC, audio system is playing

      → Changing modes

      Above 3.5 V

      → Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - EXTENSION MODULE) Click here

    OK

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

  2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - EXTENSION MODULE)


    1. Disconnect the z18 radio and display receiver assembly connector.

    2. Disconnect the z17 extension module connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z18-6 (MUTE) - z17-1 (MUTE) Always Below 1 Ω
      z18-6 (MUTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (OUTPUT SIGNAL)


    1. A00OMO8E09
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Extension Module)

      Disconnect the z17 extension module connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      z17-1 (MUTE) - Body ground Ignition switch ACC, audio system is playing Above 3.5 V

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

    REPLACE EXTENSION MODULE Click here