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NAVIGATION SYSTEM, Diagnostic DTC:B15C2

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DTC Code DTC Name
B15C2 Speed Signal Malfunction
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DESCRIPTION

The multi-media module 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 multi-media module 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.

Tip:

  • 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

  • Multi-media module receiver assembly

  • Combination meter assembly

  • Harness or connector

  • Junction connector
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System (Click here).

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PROCEDURE


  1. Click here

    CHECK SYSTEM SENSORS (OPERATION CHECK)


    1. A00084Q

      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.

      Tip:

      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 pageClick here).

  2. Click here

    INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


    1. A0008ZQE01

      Check the output waveform.


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

      2. Connect an oscilloscope to terminal H14-19 (+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 H14-19 (+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.
        Tip:

        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.

        Table 1. Text in Illustration
        *a

        Component with harness connected

        (Combination Meter Assembly)

  3. Click here

    INSPECT MULTI-MEDIA MODULE RECEIVER ASSEMBLY (INPUT WAVEFORM)


    1. A0004SPE01

      Check the input waveform.


      1. Remove the multi-media module receiver assembly with the connector(s) still connected.

      2. Connect an oscilloscope to terminal H97-56 (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 H97-56 (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.
        Tip:

        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.

      Table 2. Text in Illustration
      *a

      Component with harness connected

      (Multi-media Module Receiver Assembly)

  4. Click here

    CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - JUNCTION CONNECTOR)


    1. Disconnect the H97 multi-media module receiver assembly connector.

    2. Disconnect the H114 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H97-56 (SPD) - H114-15 Always Below 1 Ω

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

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


    1. Disconnect the H14 combination meter assembly connector.

    2. Disconnect the H115 junction connector (for LHD).

      Disconnect the H114 junction connector (for RHD).

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

      Standard Resistance
      Table 3. for LHD:
      Tester Connection Condition Specified Condition
      H14-19 (+S) - H115-20 Always Below 1 Ω
      Table 4. for RHD:
      Tester Connection Condition Specified Condition
      H14-19 (+S) - H114-12 Always Below 1 Ω

    • OK

      REPLACE JUNCTION CONNECTOR

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR