NAVIGATION SYSTEM (for Radio and Display Type) Mute Signal Circuit between Radio Receiver and Extension Module

DESCRIPTION

This circuit sends a signal to the extension module to mute noise. Due to this, 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

A01JAZCE31

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT EXTENSION MODULE


    1. A01JC9CE10
      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
      z21-1 (MUTE) - Body ground

      Power switch on (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 radio and display receiver assembly connector.

    2. Disconnect the extension module connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z22-6 (MUTE) - z21-1 (MUTE) Always Below 1 Ω
      z22-6 (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. Reconnect the radio and display receiver assembly connector.

    2. A01J8U8E08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Extension Module)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      z21-1 (MUTE) - Body ground Power switch on (ACC), audio system is playing Above 3.5 V

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

    REPLACE EXTENSION MODULE Click here