Dtc B15C2 Speed Signal Malfunction

Body Electrical. Camry. Acv40 Gsv40
Navigation. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK VEHICLE SENSOR (OPERATION CHECK)

INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

CHECK HARNESS AND CONNECTOR

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - JUNCTION CONNECTOR)

DTC B15C2 Speed Signal Malfunction


DESCRIPTION

Navigation function:
The navigation receiver assembly receives a vehicle speed signal from the combination meter assembly and vehicle speed 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 becomes large.
ASL function:
The circuit is necessary for the ASL (Automatic Sound Levelizer) built into the navigation receiver assembly. Speed signals are received from the combination meter and used for the ASL. The ASL function automatically adjusts the sound volume in order to maintain clear audio sound even when vehicle noise increases (as vehicle noise increases, the volume is turned up, etc.).
HINT:
  1. A voltage of 12 V or 5 V is output from each ECU connected to the combination meter assembly, 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 its 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. Navigation receiver assembly
  3. Wire harness or connector
  4. Junction block

WIRING DIAGRAM


for 2AR-FE

Camry. Acv40 Gsv40.Navigation.Navigation System. Dtc B15C2 Speed Signal Malfunction


for 2GR-FE

Camry. Acv40 Gsv40.Navigation.Navigation System. Dtc B15C2 Speed Signal Malfunction


INSPECTION PROCEDURE

1.CHECK VEHICLE SENSOR (OPERATION CHECK)


    Camry. Acv40 Gsv40

  1. Enter the "Vehicle Sensors" (Check GPS&Vehicle Sensor) (CAMRY_ACV40 RM000003SKF042X.html).

  1. 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
Go to step 2
OK

REPLACE NAVIGATION RECEIVER ASSEMBLY (CAMRY_ACV40 RM0000026K700ZX.html)

2.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


    Camry. Acv40 Gsv40.Navigation.Navigation System. Dtc B15C2 Speed Signal Malfunction

  1. Check the input waveform.

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

    2. Connect an oscilloscope to terminal F2-12 (+S) and body ground.

    3. Turn the ignition switch ON.

    4. Turn the wheel slowly.

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

      Item
      		Condition
      Measurement terminal
      		F2-12 (+S) - Body ground
      Tool setting
      		5 V/DIV., 20 ms./DIV.
      Vehicle condition
      		Driving at approx. 20 km/h (12 mph)
      Text in Illustration
      *1
      		Component without harness connected
      (Combination Meter Assembly)
      OK:
      The waveform is displayed as 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 (CAMRY_ACV40 RM0000012G107SX.html)
OK


3.CHECK HARNESS AND CONNECTOR


    Camry. Acv40 Gsv40.Navigation.Navigation System. Dtc B15C2 Speed Signal Malfunction

  1. Disconnect the navigation receiver assembly connector.



    Camry. Acv40 Gsv40.Navigation.Navigation System. Dtc B15C2 Speed Signal Malfunction

  1. Disconnect the combination meter assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F25-3 (SPD) - F2-12 (+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
Go to step 4
OK

REPLACE NAVIGATION RECEIVER ASSEMBLY (CAMRY_ACV40 RM0000026K700ZX.html)

4.CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - JUNCTION CONNECTOR)


    Camry. Acv40 Gsv40.Navigation.Navigation System. Dtc B15C2 Speed Signal Malfunction

  1. Disconnect the navigation receiver assembly connector.



    Camry. Acv40 Gsv40.Navigation.Navigation System. Dtc B15C2 Speed Signal Malfunction

  1. Disconnect the junction block connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F2-3 (SPD) - 3U-9
    		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 Junction Block)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - JUNCTION CONNECTOR)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (JUNCTION BLOCK)