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 ECU assembly) via the CAN communication system.

The airbag ECU 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 ECU 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. Detection Item DTC Detection Condition Trouble Area Note
C1381 Acceleration Sensor Power Supply Voltage Malfunction 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/BAG fuse

  • Acceleration sensor (Airbag ECU assembly)

  • Wire harness or connector

 -

WIRING DIAGRAM

Refer to DTCs C1232, C1243 and C1245.

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CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

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

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  • 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 engine 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.

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

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    1. Turn the engine switch off.

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

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

    4. B00580LC03
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor [Airbag ECU Assembly])

      Disconnect the I58 yaw rate and acceleration sensor (airbag ECU assembly) connector.

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

    6. Turn the engine switch on (IG).

    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 Switch Condition Specified Condition
      I58-21 (IG2) - Body ground Engine switch on (IG) 11 to 16 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. Turn the engine switch off.

    2. B00580LC04
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor [Airbag ECU Assembly])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I58-25 (E1) - Body ground Always Below 1 Ω
      I58-26 (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.

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      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  3. RECONFIRM DTC


    1. Reconnect the I58 yaw rate and acceleration sensor (airbag ECU assembly) connector.

    2. Clear the DTC.

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      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the engine switch off.

    4. Start the engine.

    5. Perform a road test.

    6. Check if the same DTC is recorded.

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      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Proceed to
      DTC C1381 is not output
      DTC C1381 is output

    DTC C1381 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC C1381 is output

    REPLACE AIRBAG ECU ASSEMBLY Click here