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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 256 (Navigation System (Hybrid) - Diagnostic Codes (1 Of 2)) >> NAVIGATION SYSTEM (for HV Model) >> DTC B15C2: Speed Signal Malfunction [06/2018 - 09/2022] >> Procedure

DTC B15C2: Speed Signal Malfunction [06/2018 - 09/2022]: Procedure

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  1. CHECK DTC 
    1. Clear the DTCs.

      Body Electrical > Navigation System > Clear DTCs 

    2. Recheck for DTCs and check that no DTCs are output.

      Body Electrical > Navigation System > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK VEHICLE SENSOR (OPERATION CHECK) 
    1. Enter the "System Sensors Check" screen. Refer to Check GPS & Vehicle Sensors in Operation Check.
      GTY427220Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to OPERATION CHECK [06/2018 - 10/2019] , or refer to OPERATION CHECK [10/2019 - 08/2021] , or refer to OPERATION CHECK [08/2021 - 09/2022]

    2. While driving the vehicle, compare the "Speed" indicator to the reading on the speedometer. Check if these readings are almost equal.

      HINT: 

      The combination meter assembly receives the vehicle speed signal from the skid control ECU via CAN communication. Therefore, perform the following procedure inspection referring to values in the Data List of the skid control ECU because it is the source of the vehicle speed signal.

      OK

      Vehicle speed displayed on the "System Sensors Check" screen is almost the same as the actual vehicle speed measured using the Techstream.

      Refer to DATA LIST / ACTIVE TEST [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  5

    Result: 

    NG 

    See step  3

  3. CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) 
    1. Check the output waveform.
      GTY790886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Combination Meter Assembly)
      1. Remove the combination meter assembly with the connector(s) still connected.
      2. Connect an oscilloscope to terminal G17-19 (+S) and body ground.
      3. Turn the power switch on (IG).
      4. Turn a wheel slowly.
      5. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Measurement terminal G17-19 (+S) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Wheel being rotated

        OK

        The waveform is similar to that shown in the illustration.

        HINT: 

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

    Result: 

    OK 

    See step  4

  4. INSPECT NAVIGATION ECU (INPUT WAVEFORM) 
    1. Check the input waveform.
      GTY797671Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Navigation ECU)
      1. Remove the navigation ECU with the connector(s) still connected.
      2. Connect an oscilloscope to terminal G14-9 (SPD) and body ground.
      3. Turn the power switch on (IG).
      4. Turn a wheel slowly.
      5. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Measurement terminal G14-9 (SPD) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Wheel being rotated

        OK

        The waveform is similar to that shown in the illustration.

        HINT: 

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. REPLACE NAVIGATION ECU 
    1. Replace the navigation ECU with a new one.

      Refer to REMOVAL [06/2018 - 08/2020] , or refer to REMOVAL [08/2020 - 09/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. CHECK DTC 
    1. Clear the DTCs.

      Body Electrical > Navigation System > Clear DTCs 

    2. Recheck for DTCs and check that no DTCs are output.

      Body Electrical > Navigation System > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (NAVIGATION ECU IS DEFECTIVE) 

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 09/2022] 

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