NAVIGATION SYSTEM Sound Signal Circuit between Radio Receiver and Extension Module

DESCRIPTION

The navigation ECU sends the sound signal to the radio and display receiver assembly via 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*1, radio and display receiver assembly, navigation ECU or speakers.


WIRING DIAGRAM

A01G3LXE06
*a (Shielded)
*b Radio and Display Receiver Assembly
*c Navigation ECU

PROCEDURE


  1. 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
      V3-2 (CDR+) - V1-13 (CDR+) Always Below 1 Ω
      V3-3 (CDR-) - V1-12 (CDR-) Always Below 1 Ω
      V3-4 (CDL+) - V1-15 (CDL+) Always Below 1 Ω
      V3-5 (CDL-) - V1-14 (CDL-) Always Below 1 Ω
      V3-1 (CSHLD) - V1-28 (CSHLD) Always Below 1 Ω
      V3-2 (CDR+) - Body ground Always 10 kΩ or higher
      V3-3 (CDR-) - Body ground Always 10 kΩ or higher
      V3-4 (CDL+) - Body ground Always 10 kΩ or higher
      V3-5 (CDL-) - Body ground Always 10 kΩ or higher
      V3-1 (CSHLD) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR