NAVIGATION SYSTEM(for SD), 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 receives 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 the respective systems based on the pulse signal.

  • If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below 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.

  • Meter/gauge system

  • Harness or connector

  • Navigation receiver assembly

WIRING DIAGRAM

E280956E07

CAUTION / NOTICE / HINT

Note:

Check that the wire harness is properly installed and does not have any sharp bends, pinching or loose connections.

Click hereClick hereClick here

PROCEDURE

  1. CHECK VEHICLE SENSOR (OPERATION CHECK)

    1. E276610

      Enter the "System Sensors Check" screen. Refer to Check GPS & Vehicle Sensors in Operation Check.

      Click here

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

      OK

      The readings are equal or almost equal.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY

    Click here

    NG

  2. CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

    1. E256135C11

      *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 G16-6 (+S) and body ground.

      3. Turn the engine 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

        G16-6 (+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.

    Result

    Proceed to

    OK

    NG
    NG

    GO TO METER / GAUGE SYSTEM

    Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)

    1. Disconnect the G139 navigation receiver assembly connector.

    2. Disconnect the G16 combination meter assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G139-17 (SPD) - G16-6 (+S)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR