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 pre-crash safety city sensor receives vehicle stability signals from the yaw rate sensor. When the precrash safety city sensor detects a malfunction in the yaw rate sensor, a DTC is output.

DTC Code DTC Detection Condition Trouble Area
C1AA4 When the ignition switch is ON and the system is operating, the pre-crash safety city sensor continuously receives a malfunction signal for 1 second or more from the yaw rate sensor.

  • Vehicle stability control system

  • Yaw rate sensor

  • Pre-crash safety city sensor
C1AA5 When the ignition switch is ON and the system is operating, the pre-crash safety city sensor continuously receives a power supply malfunction signal for 1 second or more from the yaw rate sensor.

  • Vehicle stability control system

  • Yaw rate sensor

  • Pre-crash safety city sensor

CAUTION / NOTICE / HINT

Note


  • When replacing the pre-crash safety city sensor, replace it with a new one and be sure to initialize the settings. If an ECU which was installed to another vehicle is used, the information stored in the pre-crash safety city sensor will not match the information from the vehicle and, as a result, a DTC may be output.

  • When the pre-crash safety city sensor is replaced with a new one or it is removed, camera beam axis learning must be performed.

  • If the airbag sensor assembly is replaced, perform zero point calibration of the yaw rate sensor and G sensor, and initialize the systems.

  • Since CAN communication is used, first perform the communication function check in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting.

PROCEDURE


  1. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      Vehicle stability control system DTC is not output A
      Vehicle stability control system DTC is output B

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    A

  2. CHECK FOR DTC


    1. Clear the DTCs Click here.

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

      Tech Tips

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

    3. Check for DTCs Click here.

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE PRE-CRASH SAFETY CITY SENSOR


    1. Replace the pre-crash safety city sensor with a new one Click here.


    NEXT

  4. CHECK FOR DTC


    1. Clear the DTCs Click here.

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

      Tech Tips

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

    3. Check for DTCs Click here.

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

    A

    END (PRE-CRASH SAFETY CITY SENSOR WAS DEFECTIVE)

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)