Dtc B15C2 Speed Signal Malfunction

Audio Visual Telematics. Corolla. Zre142 Aze141
Audio Video. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK VEHICLE SENSOR (OPERATION CHECK)

INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

INSPECT NAVIGATION RECEIVER ASSEMBLY

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

DTC 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.
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. Wire harness or connector
  3. No. 4 Junction block
  4. Navigation receiver assembly

WIRING DIAGRAM


Corolla. Zre142 Aze141.Audio Video.Audio And Visual System (W/O Multi-Display). Dtc B15C2 Speed Signal Malfunction


INSPECTION PROCEDURE

1.CHECK VEHICLE SENSOR (OPERATION CHECK)


    Corolla. Zre142 Aze141

  1. Enter the "Vehicle Sensors" screen. Refer to Check GPS & Vehicle Sensor in Operation Check (COROLLA_ZRE142 RM000003SKF0ACX.html)

    2.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


      Corolla. Zre142 Aze141.Audio Video.Audio And Visual System (W/O Multi-Display). Dtc B15C2 Speed Signal Malfunction

    1. Check the output waveform.

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

      2. Connect an oscilloscope to terminal E46-36 (+S) and body ground.

      3. Turn the ignition switch to ON.

      4. Turn a wheel slowly.

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

        Item
        		Condition
        Measurement terminal
        		E46-36 (+S) - Body ground
        Tool setting
        		5 V/DIV., 20 ms./DIV.
        Vehicle condition
        		Wheel being rotated
        Text in Illustration
        *a
        		Component with harness connected
        (Combination Meter Assembly)
        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.


    		NG
    GO TO METER / GAUGE SYSTEM (COROLLA_ZRE142 RM000002UD708MX.html)
    OK


    3.INSPECT NAVIGATION RECEIVER ASSEMBLY


      Corolla. Zre142 Aze141.Audio Video.Audio And Visual System (W/O Multi-Display). Dtc B15C2 Speed Signal Malfunction

    1. Check the input waveform.

      1. Remove the navigation receiver assembly with the connector(s) still connected.

      2. Connect an oscilloscope to terminal E117-3 (SPD) and body ground.

      3. Turn the ignition switch to ON.

      4. Turn a wheel slowly.

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

        Item
        		Condition
        Measurement terminal
        		E117-3 (SPD) - 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
        (Navigation Receiver Assembly)


    		NG
    Go to step 4
    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY (COROLLA_ZRE142 RM000002XAJ01EX.html)

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

    1. Disconnect the E117 navigation receiver assembly connector.

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

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      E117-3 (SPD) - 4C-1
      		Always
      		Below 1 Ω


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

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 4 JUNCTION BLOCK)