LANE DEPARTURE ALERT SYSTEM, Diagnostic DTC:C1AA4, C1AA5

DTC Code DTC Name
C1AA4 Yaw Rate Sensor Circuit
C1AA5 Yaw Rate Sensor Power Supply Voltage Circuit

DESCRIPTION

The forward recognition camera receives vehicle stability signals from the yaw rate sensor (airbag sensor assembly). If the yaw rate sensor (airbag sensor assembly) detects an abnormal yaw rate sensor signal or yaw rate sensor (airbag sensor assembly) power supply voltage, it informs the forward recognition camera via CAN communication, and DTC C1AA4 or C1AA5 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AA4 Yaw Rate Sensor Circuit While the vehicle speed is 1 km/h (1 mph) or more, the lane departure alert system is operating and a signal from the yaw rate sensor indicating a malfunction in the yaw rate sensor (airbag sensor assembly) is detected by the forward recognition camera for 5 seconds or more.

  • Vehicle stability control system

  • Yaw rate sensor (airbag sensor assembly)

  • Forward recognition camera
C1AA5 Yaw Rate Sensor Power Supply Voltage Circuit While the vehicle speed is 1 km/h (1 mph) or more, the lane departure alert system is operating and a signal from the yaw rate sensor (airbag sensor assembly) indicating an abnormal yaw rate sensor power supply voltage signal is detected by the forward recognition camera for 5 seconds or more.

  • Vehicle stability control system

  • Yaw rate sensor (airbag sensor assembly)

  • Forward recognition camera

CAUTION / NOTICE / HINT

Note


  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.

  • If the forward recognition camera has been replaced with a new one, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.

    Click here

  • First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)


    1. Check for DTCs.

      for 2TR-FE: Click here

      except 2TR-FE: Click here

      Tech Tips

      Lane departure alert system DTC C1AA4 or C1AA5 may be stored due to a malfunction in the vehicle stability control system. Therefore it is necessary to check for and troubleshoot vehicle stability control system DTCs first.

      Result
      Result Proceed to
      Vehicle stability control system DTCs are not output A
      Vehicle stability control system DTCs are output B

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM for 2TR-FE: Click here
    GO TO VEHICLE STABILITY CONTROL SYSTEM except 2TR-FE: Click here

    A

  2. CHECK FOR DTCs (LANE DEPARTURE ALERT SYSTEM)


    1. Clear the DTCs.

      Click here

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC C1AA4 and C1AA5 are not output. A
      DTC C1AA4 or C1AA5 is output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera.

      Click here

    2. Adjust the forward recognition camera.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (LANE DEPARTURE ALERT SYSTEM)


    1. Clear the DTCs.

      Click here

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC C1AA4 and C1AA5 are not output. A
      DTC C1AA4 or C1AA5 is output. B

    A

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    B

    REPLACE YAW RATE SENSOR (AIRBAG SENSOR ASSEMBLY) Click here