AUDIO AND VISUAL SYSTEM (w/ Navigation System) Sound Signal Circuit between Navigation ECU and Multi-media Interface ECU

DESCRIPTION

The multi-media interface ECU sends a sound signal to the display and navigation module display through this circuit.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly, radio receiver assembly, display and navigation module display or speakers.

WIRING DIAGRAM

A01NGGAE01

INSPECTION PROCEDURE

Note

When replacing the display and navigation module display, perform vehicle contract setting (w/ G-BOOK System) Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR


    1. A01NGG1E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Display and Navigation Module Display)
      *2

      Front view of wire harness connector

      (to Multi-media Interface ECU)

      Disconnect the display and navigation module display connector and the multi-media interface ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G23-1 (AGND) - U9-1 (USD1) Always Below 1 Ω
      G23-3 (VAR+) - U9-2 (URO+) Always Below 1 Ω
      G23-4 (VAL+) - U9-3 (ULO+) Always Below 1 Ω
      G23-7 (VA-) - U9-4 (UGD1) Always Below 1 Ω
      G23-1 (AGND) - Body ground Always 10 kΩ or higher
      G23-3 (VAR+) - Body ground Always 10 kΩ or higher
      G23-4 (VAL+) - Body ground Always 10 kΩ or higher
      G23-7 (VA-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      G27-1 (AGND) - U9-1 (USD1) Always Below 1 Ω
      G27-3 (VAR+) - U9-2 (URO+) Always Below 1 Ω
      G27-4 (VAL+) - U9-3 (ULO+) Always Below 1 Ω
      G27-7 (VA-) - U9-4 (UGD1) Always Below 1 Ω
      G27-1 (AGND) - Body ground Always 10 kΩ or higher
      G27-3 (VAR+) - Body ground Always 10 kΩ or higher
      G27-4 (VAL+) - Body ground Always 10 kΩ or higher
      G27-7 (VA-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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