NAVIGATION SYSTEM(for SD) Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier

SYSTEM DESCRIPTION

This circuit sends a signal to the stereo component amplifier assembly 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 stereo component amplifier assembly is functioning normally, no sound or only an extremely faint sound can be heard.

WIRING DIAGRAM

A01VATKE04
*a MUTE
*b Stereo Component Amplifier Assembly
*c Navigation Receiver Assembly

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 STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A01V9RPC15
      *a

      Component with harness connected

      (Stereo Component Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      M32-1 (MUTE) - Body ground Ignition switch ACC, audio system playing→ Changing modes Above 3.5 V→ Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the G139 navigation receiver assembly connector.

    2. Disconnect the M32 stereo component amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G139-16 (MUT1) - M32-1 (MUTE) Always Below 1 Ω
      G139-16 (MUT1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)


    1. Disconnect the navigation receiver assembly connector.

    2. A01VB22C08
      *a

      Front view of wire harness connector

      (to Navigation Receiver Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G139-16 (MUT1) - Body ground Ignition switch ACC, audio system playing→ Changing modes Above 3.5 V→ Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

    NG

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here