VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1381

DTC Code DTC Name
C1381 Acceleration Sensor Power Supply Voltage Malfunction

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2).

If there is trouble in the bus lines between the acceleration sensor (airbag sensor assembly) and the CAN communication system, the DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) is output.

These DTCs are also output when calibration has not been completed.

DTC No. DTC Detection Condition Trouble Area
C1381 At a vehicle speed of more than 3 km/h (2 mph), the acceleration sensor power source malfunction signal is received for 10 seconds or more.

  • A/B fuse

  • Acceleration sensor (Airbag sensor assembly)

  • Wire harness or connector

WIRING DIAGRAM

Refer to DTCs C1232, C1243 and C1245 Click here.

INSPECTION PROCEDURE

Note


  • When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform zero point calibration and store system information Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (IG2 TERMINAL)

    Note


    • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

    • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. B007P30E27
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    4. Disconnect the B4 yaw rate and acceleration sensor (airbag sensor assembly) connector.

    5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    6. Turn the ignition switch to ON.

    7. Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B4-21 (IG2) - Body ground Ignition switch ON 11 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (E TERMINAL)


    1. B007P30E28
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

      Turn the ignition switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B4-25 (E1) - Body ground Always Below 1 Ω
      B4-26 (E2) - Body ground Always Below 1 Ω

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (E CIRCUIT)

    OK

  3. RECONFIRM DTC


    1. Reconnect the B4 yaw rate and acceleration sensor (airbag sensor assembly) connector.

    2. Clear the DTC Click here.

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 3 km/h (2 mph) or more for at least 10 seconds.

    6. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC C1381 is not output. A
      DTC C1381 is output B

      Note

      Check the yaw rate and acceleration sensor signal after replacement Click here.


    B

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here