DTC    B15C2    Speed Signal Malfunction

for Preparation Click here


DESCRIPTION

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

HINT:
  1. 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.
  2. 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
  1. Combination meter assembly
  2. Display and navigation module display
  3. Wire harness or connector

WIRING DIAGRAM


E217460E01


INSPECTION PROCEDURE

1.CHECK VEHICLE SENSOR (OPERATION CHECK)


    E176549

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

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

    HINT:
    The meter ECU 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 "Vehicle Sensors" screen is almost the same as the actual vehicle speed measured using the intelligent tester (Click here).



NG
Go to step 2
OK

REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY (Click here)  

2.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


    E159354E60

  1. Check the output waveform.

    1. Reconnect the H19 combination meter assembly connector.

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

    3. Connect an oscilloscope to terminal H19-40 (+S) and body ground.

    4. Turn the power switch on (IG).

    5. Turn a wheel slowly.

    6. Check the signal waveform according to the condition(s) in the table below.
      Item
      		Condition
      Measurement terminal
      		H19-40 (+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.

      HINT:
      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.

      Text in Illustration 
      *a
      		Component with harness connected
      (Combination Meter Assembly)



NG
GO TO METER / GAUGE SYSTEM (Click here)
OK


3.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H60 display and navigation module display connector.

  1. Disconnect the H19 combination meter assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H60-18 (SPD) - H19-40 (+S)
    		Always
    		Below 1 Ω



NG
Go to step 4
OK

REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY (Click here)  

4.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H60 display and navigation module display connector.

  1. Disconnect the H117 junction connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H60-18 (SPD) - H117-99
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

GO TO METER / GAUGE SYSTEM (Click here)