NAVIGATION SYSTEM (for DVD), 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 (No. 3 meter circuit plate) and information from the navigation antenna, and then adjusts vehicle position.

The navigation receiver assembly stores this DTC when the difference between the speed information that the navigation antenna receives and the SPD pulse received from the combination meter assembly (No. 3 meter circuit plate) 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 (No. 3 meter circuit plate). The signal is changed to a pulse signal at the transistor in the combination meter assembly (No. 3 meter circuit plate). 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 (No. 3 meter circuit plate)

  • Wire harness or connector

  • No. 4 junction block

  • No. 3 junction block

  • Navigation receiver assembly

WIRING DIAGRAM

A01JCM7E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK VEHICLE SENSOR (OPERATION CHECK)


    1. A01J90J

      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.

      Tech Tips

      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 (See page Click here).

    NG

    INSPECT COMBINATION METER ASSEMBLY (NO.3 METER CIRCUIT PLATE OUTPUT WAVEFORM) Click here

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

  2. INSPECT COMBINATION METER ASSEMBLY (NO.3 METER CIRCUIT PLATE OUTPUT WAVEFORM)


    1. A01JBSEE21
      Text in Illustration
      *1

      Component with harness connected

      (Combination Meter Assembly)

      Check the input waveform.


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

      2. Connect an oscilloscope to terminal L27-7 (+S) and body ground.

      3. Turn the power switch on (IG).

      4. Turn the wheel slowly.

      5. Check the signal waveform according to the condition(s) in the table below.

        Item Condition
        Measurement terminal L27-7 (+S) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Driving at approx. 20 km/h (12 mph)
        OK
        The waveform is displayed as 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. A01J9H1E30

      Disconnect the L42 navigation receiver assembly connector.

    2. A01JC7WE06

      Disconnect the L27 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L42-3 (SPD) - L27-7 (+S) Always Below 1 Ω
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Navigation Receiver Assembly)
      *2

      Front view of wire harness connector

      (to Combination Meter Assembly)

    NG

    CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - NO. 4 JUNCTION CONNECTOR) Click here

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - NO. 4 JUNCTION CONNECTOR)


    1. A01J9H1E30
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Navigation Receiver Assembly)
      *2

      Front view of wire harness connector

      (to No. 4 Junction Block)

      Disconnect the L42 navigation receiver assembly connector.

    2. Disconnect the 4A No. 4 junction block connector.

      A01J8IXE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L42-3 (SPD) - 4A-68 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - NO. 4 JUNCTION CONNECTOR)

    OK

  5. CHECK HARNESS AND CONNECTOR (No. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)


    1. Disconnect the 4A No. 4 junction block connector.

      A01J8IXE02

    2. Disconnect the 3B No. 3 junction block connector.

      A01JCYEE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4A-21 - 3B-82 Always Below 1 Ω
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 4 Junction Block)

      		 *2

      Front view of wire harness connector

      (to No. 3 Junction Block)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    OK

  6. CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. Disconnect the 3A No. 3 junction block connector.

      A01J8IXE03
    2. A01JC7WE06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)
      *2

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the L27 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-47 - L27-7 (+S) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

    OK

  7. INSPECT NO. 4 JUNCTION BLOCK


    1. A01J8T1E01
      Text in Illustration
      *1 No. 4 Junction Block

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4A-68 - 4A-21 Always Below 1 Ω

    NG

    REPLACE NO. 4 JUNCTION BLOCK

    OK

  8. INSPECT NO. 3 JUNCTION BLOCK


    1. A01J8T1E02
      Text in Illustration
      *1 No. 3 Junction Block

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

      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      3A-47 - 3B-82 Always Below 1 Ω

    NG

    REPLACE NO. 3 JUNCTION BLOCK

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here