NAVIGATION SYSTEM (for HDD) Mute Signal Circuit between Navigation Receiver Assembly and Multi-media Interface ECU

DESCRIPTION

The navigation receiver assembly controls the volume according to the mute signal from the multi-media interface ECU.

The mute signal is sent to reduce noise and popping sounds, such as those generated when changing sources. 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 receiver assembly is functioning normally, no sound or only an extremely faint sound can be heard.

WIRING DIAGRAM

A017CWNE43

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT MULTI-MEDIA INTERFACE ECU


    1. A017FD9E31
      Text in Illustration
      *a

      Component with harness connected

      (Multi-media Interface ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E25-6 (MUT1) - Body ground Ignition switch ACC, USB audio system or satellite radio playing → Changing sources Above 3.5 V → Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - MULTI-MEDIA INTERFACE ECU) Click here

    OK

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

  2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - MULTI-MEDIA INTERFACE ECU)


    1. Disconnect the E23 navigation receiver assembly connector.

    2. Disconnect the E25 multi-media interface ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E23-6 (MUTE) - E25-6 (MUT1) Always Below 1 Ω
      E23-6 (MUTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE MULTI-MEDIA INTERFACE ECU


    1. Replace the multi-media interface ECU and check that the malfunction disappears Click here.

      OK
      Malfunction disappears.

    NG

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

    OK

    END