NAVIGATION SYSTEM (for DVD), Diagnostic DTC:B15C2

DTC Code DTC Name
B15C2 Speed Signal Malfunction

DESCRIPTION

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

The display and navigation module display stores this DTC when the difference between the speed information that the GPS antenna 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 No. DTC Detection Condition Trouble Area
B15C2 A difference between the GPS speed and SPD pulse is detected.

  • Combination meter assembly

  • Wire harness or connector

  • Display and navigation module display

WIRING DIAGRAM

A0160GVE16

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK VEHICLE SENSOR (OPERATION CHECK)


    1. A0160O8

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

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

      OK
      The readings are almost equal.

    NG

    CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - JUNCTION BLOCK) Click here

    OK

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

  2. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - JUNCTION BLOCK)


    1. Disconnect the J122 display and navigation module display connector.

    2. Disconnect the J34 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J122-18 (SPD) - J34-5 (+S) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


    1. A015ZJIE28

      Reconnect the J34 combination meter assembly.


      1. Check the input waveform.

      2. Connect an oscilloscope to terminal J122-18 (SPD) 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.

        A0162TDE08
        Item Condition
        Measurement terminal J122-18 (SPD) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Wheel being rotated
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Display and Navigation Module Display)
        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

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here