ROAD SIGN ASSIST SYSTEM, Diagnostic DTC:C1AA4

DTC Code DTC Name
C1AA4 Yaw Rate Sensor 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, it informs the forward recognition camera via CAN communication, and DTC C1AA4 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AA4 Yaw Rate Sensor Circuit After the engine switch is turned on (IG) for 3 seconds or more, when the vehicle is being driven at a speed of 1 km/h or 1 mph or more, a signal from the yaw rate sensor (airbag sensor assembly) indicating a malfunction in the yaw rate sensor is detected by the forward recognition camera for 5 seconds or more.

  • Vehicle stability control system

  • 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 forward recognition camera adjustment.

    Click here

  • The road sign assist system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

    Tech Tips

    Road sign assist system DTC C1AA4 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.


    1. Check for DTCs.


      Chassis > ABS/VSC/TRC > Trouble Codes
      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 Click here

    A

  2. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)


    1. Clear the DTCs.


      Body Electrical > Road Sign Assist > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the engine switch on (IG) and wait 3 seconds or more.

      2. Drive the vehicle at a speed of 1 km/h or 1 mph or more for 5 seconds or more.

    3. Check for DTCs.


      Body Electrical > Road Sign Assist > Trouble Codes
      Result
      Result Proceed to
      DTC C1AA4 is not output A
      DTC C1AA4 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE FORWARD RECOGNITION CAMERA Click here