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Mute Signal Circuit between Stereo Component Amplifier Assembly and Navigation ECU: Procedure

  1. CHECK NAVIGATION ECU (MUT2 VOLTAGE) 
    1. Measure the voltage of the ECU connector.
      Fig 1: Identifying Connector Terminals
      GTY125358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      N3-15 (MUT2) - N3-17 (GND1) Voice guidance ON Below 1 V

    NG → REPLACE NAVIGATION ECU 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (NAVIGATION ECU - STEREO COMPONENT AMPLIFIER AND BODY GROUND) 
    1. Disconnect the N3 ECU connector.
      Fig 2: Identifying Connector Terminals
      GTY156311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the N6 amplifier connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance

      Tester Connection Specified Condition
      N3-15 (MUT2) - N6-4 (NAVI) Below 1 Ω
      N3-17 (GND1) - Body ground Below 1 Ω
      N3-15 (MUT2) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  3. CHECK NAVIGATION AMPLIFIER (NAVO VOLTAGE) 
    1. Measure the voltage of the amplifier connector.
      Fig 3: Identifying Connector Terminals
      GTY156262Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      N6-11 (NAVO) - N6-8 (GND) Voice guidance ON Below 1 V

    NG → REPLACE NAVIGATION AMPLIFIER 

    OK: Go to next step 

  4. CHECK WIRE HARNESS (NAVIGATION AMPLIFIER - STEREO COMPONENT AMPLIFIER AND BODY GROUND) 
    1. Disconnect the N6 and S23 amplifier connectors.
      Fig 4: Identifying Connector Terminals
      GTY156263Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the wire harness side connectors.

      Standard resistance

      Tester Connection Specified Condition
      N6-11 (NAVO) - S23-9 (N-MU) Below 1 Ω
      N6-8 (GND) - Body ground Below 1 Ω
      N6-11 (NAVO) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

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