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Microphone Circuit between Multi-display and Navigation ECU: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Multi-Display And Navigation ECU Microphone Circuit - Wiring Diagram
G04050504Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - NAVIGATION ECU) 
    1. Disconnect the multi-display connector p1 and navigation ECU connector p3.
    2. Measure the resistance according to the value(s) in the table below.
      STANDARD RESISTANCE

      Tester connection Condition Specified condition
      MCO+ - MIC+ Always Below 1 Ω
      MCO- - MIC- Always Below 1 Ω
      MCO+ - Body ground Always 10 kΩ or higher
      MCO- - Body ground Always 10 kΩ or higher
      Fig 2: Identifying Multi-Display Connector p1 And Navigation ECU Connector p3
      G04050505Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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