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 meter circuit plate 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 from the navigation antenna assembly and the SPD pulse received from the meter circuit plate becomes large.

Tech Tips


  • A voltage of 12 V or 5 V is output from each ECU and then input to the meter circuit plate. The signal is changed to a pulse signal at the transistor in the meter circuit plate. 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. Detection Item DTC Detection Condition Trouble Area
B15C2 Speed Signal Malfunction A difference between the GPS speed and SPD pulse is detected.

  • Navigation receiver assembly

  • Meter circuit plate

  • Harness or connector

  • No. 11 junction connector

WIRING DIAGRAM

A003N28E01

PROCEDURE


  1. CHECK SYSTEM SENSORS (OPERATION CHECK)


    1. A003LY9

      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 meter circuit plate 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.
      Click here Click here
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

    NG

  2. INSPECT METER CIRCUIT PLATE (OUTPUT WAVEFORM)


    1. A003L3IC60
      *a

      Component with harness connected

      (Meter Circuit Plate)

      Check the output waveform.


      1. Remove the meter circuit plate with the connector(s) still connected.

      2. Connect an oscilloscope to terminal I6-19 (+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 I6-19 (+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.

        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
      Proceed to
      OK
      NG

    NG

    GO TO METER / GAUGE SYSTEM Click here

    OK

  3. INSPECT NAVIGATION RECEIVER ASSEMBLY (INPUT WAVEFORM)


    1. A003K14C36
      *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 I33-17 (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 I33-17 (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
      Proceed to
      OK
      NG

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR