ROAD SIGN ASSIST SYSTEM, Diagnostic DTC:C1AA3

DTC Code DTC Name
C1AA3 Vehicle Speed Sensor Circuit

DESCRIPTION

The forward recognition camera receives vehicle speed signals from the skid control ECU (brake actuator assembly). If the skid control ECU (brake actuator assembly) receives a vehicle speed sensor malfunction signal, it informs the forward recognition camera via CAN communication, and DTC C1AA3 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AA3

Vehicle Speed Sensor Circuit

While driving with the road sign assist system activated, a signal indicating a malfunction in the vehicle speed sensor is received from the skid control ECU for 5 seconds or more.

  • Vehicle stability control system

  • Skid control ECU (Brake actuator 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 confirming that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

    Click here

PROCEDURE

  1. CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

    Tip:

    If DTC C1AA3 is stored, the vehicle stability control system may be malfunctioning. Check for DTCs related to the vehicle stability control system first.

    1. Check for DTCs.

      Click here

      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 hereClick here

    A

  2. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)

    1. Clear the DTCs.

      Click here

      Body Electrical > Road Sign Assist > Clear DTCs

    2. Make sure that the following conditions are met.

      Tip:

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

    3. Check for DTCs.

      Click here

      Body Electrical > Road Sign Assist > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1AA3 is not output

    A

    DTC C1AA3 is output

    B
    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick 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 (ROAD SIGN ASSIST SYSTEM)

    1. Clear the DTCs.

      Click here

      Body Electrical > Road Sign Assist > Clear DTCs

    2. Make sure that the following conditions are met.

      Tip:

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

    3. Check for DTCs.

      Click here

      Body Electrical > Road Sign Assist > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1AA3 is not output

    A

    DTC C1AA3 is output

    B
    A

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    B

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

    Click hereClick here