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 receives 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 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 Code DTC Detection Condition Trouble Area
B15C2 A difference between the GPS speed and SPD pulse is detected.

  • Meter/gauge system

  • Harness or connector

  • Navigation receiver assembly

WIRING DIAGRAM

A01DMP2E06

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK VEHICLE SENSOR (OPERATION CHECK)


    1. A01DOXN

      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.

    NG

    CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) Click here

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

  2. CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


    1. A01DPLIE10
      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 Click here.

      2. Connect an oscilloscope to terminal G6-32 (+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 G6-32 (+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. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)


    1. Disconnect the H56 navigation receiver assembly connector.

    2. Disconnect the G6 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H56-17 (SPD) - G6-32 (+S) Always Below 1 Ω
      H56-17 (SPD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here