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Sound Signal Circuit between Navigation ECU and Multi-media Interface ECU: Procedure

  1. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the display and navigation module display connector and multi-media interface ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F76-7 (VA-) - F80-4 (UGD1) Always Below 1 Ω
      F76-4 (VAL+) - F80-3 (ULO+) Always Below 1 Ω
      F76-3 (VAR+) - F80-2 (URO+) Always Below 1 Ω
      F76-1 (AGND) - F80-1 (USD1) Always Below 1 Ω
      F76-7 (VA-) - Body ground Always 10 kΩ or higher
      F76-4 (VAL+) - Body ground Always 10 kΩ or higher
      F76-3 (VAR+) - Body ground Always 10 kΩ or higher
      F76-1 (AGND) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   2 

  2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE