NAVIGATION SYSTEM(except Sedan) Mute Signal Circuit between Radio Receiver and Extension Module

DTC Code DTC Name
Mute Signal Circuit between Radio Receiver and Extension Module

DESCRIPTION

This circuit sends a signal to the navigation ECU 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 navigation ECU is functioning, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM

E226158E99

PROCEDURE

  1. INSPECT NAVIGATION ECU

    1. E226639C05

      *a

      Component with harness connected

      (Navigation ECU)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      V1-1 (MUTE) - Body ground

      Ignition switch ACC, audio system is playing

      → Changing modes

      3.5 V or higher

      → 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 (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)

    1. Disconnect the V3 radio and display receiver assembly connector.

    2. Disconnect the V1 navigation ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      V3-6 (MUTE) - V1-1 (MUTE)

      Always

      Below 1 Ω

      V3-6 (MUTE) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. Reconnect the V3 radio and display receiver assembly connector.

    2. E227399C04

      *a

      Front view of wire harness connector

      (to Navigation ECU)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      V1-1 (MUTE) - Body ground

      Ignition switch ACC, audio system is playing

      3.5 V or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE NAVIGATION ECU

    Click here

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here