NAVIGATION SYSTEM (for Built-in Memory) Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier

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

A01DURDE08

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A01DPNPE53
      Text in Illustration
      *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
      H63-1 (MUTE) - Body ground

      Engine switch on (ACC), audio system playing

      → Changing modes

      Above 3.5 V

      → Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    OK

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

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


    1. Disconnect the H61 navigation receiver assembly connector.

    2. Disconnect the H63 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
      H61-20 (MUT1) - H63-1 (MUTE) Always Below 1 Ω
      H61-20 (MUT1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)


    1. A01DQIVE31
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Navigation Receiver Assembly)

      Disconnect the navigation receiver assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H61-20 (MUT1) - Body ground Engine switch on (ACC), audio system is playing Above 3.5 V

    NG

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here