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Navigation ECU Communication Stop Mode: Procedure

  1. CHECK CAN BUS WIRE FOR DISCONNECTION (NAVIGATION ECU BRANCH WIRE) 
    1. Turn the power switch off.
    2. Disconnect the navigation ECU connector.
      Fig 1: Identifying Navigation ECU Connector Terminals
      GTY229260Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front view of wire harness connector
      (to Navigation ECU)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      L37-2 (CANH) - L37-3 (CANL) Power switch off 54 to 69 Ω

    NG → REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (NAVIGATION ECU BRANCH WIRE) 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) 
    1. w/ "Bluetooth" Audio System
      1. Measure the voltage according to the value(s) in the table below.
        Fig 2: Identifying Navigation ECU Connector Terminals
        GTY229862Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Front view of wire harness connector
        (to Navigation ECU)

        Standard Voltage

        Tester Connection Condition Specified Condition
        L40-1 (B) - Body ground Always 11 to 14 V
        L40-11 (ACC) - Body ground Power switch on (ACC) 11 to 14 V
        L42-2 (IG) - Body ground Power switch on (IG) 11 to 14 V
    2. w/o "Bluetooth" Audio System
      1. Measure the voltage according to the value(s) in the table below.
        Fig 3: Identifying Navigation ECU Connector Terminals
        GTY216371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Front view of wire harness connector
        (to Navigation ECU)

        Standard Voltage

        Tester Connection Condition Specified Condition
        L34-4 (B) - Body ground Always 11 to 14 V
        L34-3 (ACC) - Body ground Power switch on (ACC) 11 to 14 V
        L42-2 (IG) - Body ground Power switch on (IG) 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL) 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL) 
    1. w/ "Bluetooth" Audio System
      1. Measure the resistance according to the value(s) in the table below.
        Fig 4: Identifying Navigation ECU Connector Terminals
        GTY213908Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Front view of wire harness connector
        (to Navigation ECU)

        Standard Resistance

        Tester Connection Condition Specified Condition
        L40-20 (GND) - Body ground Always Below 1 Ω
    2. w/o "Bluetooth" Audio System
      1. Measure the resistance according to the value(s) in the table below.
        Fig 5: Identifying Navigation ECU Connector Terminals
        GTY212481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Front view of wire harness connector
        (to Navigation ECU)

        Standard Resistance

        Tester Connection Condition Specified Condition
        L34-7 (GND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL) 

    OK → See step   4 

  4. REPLACE NAVIGATION RECEIVER ASSEMBLY (NAVIGATION ECU). Refer to  REMOVAL 
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