NAVIGATION SYSTEM (for Navigation Receiver Type), Diagnostic DTC:B15C2

DTC Code DTC Name
B15C2 Speed Signal Malfunction

DESCRIPTION

The navigation receiver assembly receives a vehicle speed signal from the combination meter assembly and information from the navigation antenna assembly, and then adjusts the vehicle position.

The navigation receiver assembly stores this DTC when the difference between the speed information that the navigation antenna assembly and the SPD pulse received from the combination meter assembly becomes large.

Tech Tips


  • A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls its respective systems based on this pulse signal.

  • If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the following diagram will not operate normally.

DTC No. DTC Detection Condition Trouble Area
B15C2 A difference between the GPS speed and SPD pulse is detected

  • Navigation receiver assembly

  • Combination meter assembly

  • Harness or connector

  • Junction connector

WIRING DIAGRAM


  1. for 2AR-FE

    B000L7WE01

  2. for 2GR-FE

    B000L7WE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK SYSTEM SENSORS (OPERATION CHECK)


    1. B000N7M

      Enter the "System Sensors Check" screen.

      Refer to Check System Sensors in Operation Check Click here.

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

      Tech Tips

      The combination meter assembly receives the vehicle speed signal from the skid control ECU via CAN communication. Therefore, perform the following inspection referring to values on 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 GTS (See page Click here).
      Result
      Result Proceed to
      NG A
      OK (for TMMK Made) B
      OK (for TMC Made) C

    B

    REPLACE NAVIGATION RECEIVER ASSEMBLY (for TMMK Made) Click here

    C

    REPLACE NAVIGATION RECEIVER ASSEMBLY (for TMC Made) Click here

    A

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


    1. B000KDFE16
      Text in Illustration
      *a

      Component with harness connected

      (Combination Meter Assembly)

      Check the output waveform.


      1. Remove the combination meter assembly with the connector(s) still connected.

      2. Connect an oscilloscope to terminal I18-3 (+S) and body ground.

      3. Turn the ignition switch to ON.

      4. Turn a wheel slowly.

      5. Check the signal waveform according to the condition(s) in the table below.

        Item Condition
        Measurement terminal I18-3 (+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.

        Tech Tips

        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.


    NG

    GO TO METER / GAUGE SYSTEM Click here

    OK

  3. INSPECT NAVIGATION RECEIVER ASSEMBLY (INPUT WAVEFORM)


    1. B000K5LE08
      Text in Illustration
      *a

      Component with harness connected

      (Navigation Receiver Assembly)

      Check the input waveform.


      1. Remove the navigation receiver assembly with the connector(s) still connected.

      2. Connect an oscilloscope to terminal I67-17 (SPD) and body ground.

      3. Turn the ignition switch to ON.

      4. Turn a wheel slowly.

      5. Check the signal waveform according to the condition(s) in the table below.

        Item Condition
        Measurement terminal I67-17 (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.

        Tech Tips

        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
      Result Proceed to
      NG A
      OK (for TMMK Made) B
      OK (for TMC Made) C

    B

    REPLACE NAVIGATION RECEIVER ASSEMBLY (for TMMK Made) Click here

    C

    REPLACE NAVIGATION RECEIVER ASSEMBLY (for TMC Made) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - JUNCTION CONNECTOR)


    1. Disconnect the I67 navigation receiver assembly connector.

    2. Disconnect the I124 junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I67-17 (SPD) - I124-17 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - JUNCTION CONNECTOR)


    1. Disconnect the I18 combination meter assembly connector.

    2. Disconnect the I124 junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I18-3 (+S) - I124-18 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE JUNCTION CONNECTOR