ROAD SIGN ASSIST SYSTEM, Diagnostic DTC:U0123, U0129

DTC Code DTC Name
U0123 Lost Communication with Yaw Rate Sensor Module
U0129 Lost Communication with Brake System Control Module

DESCRIPTION

When a malfunction is detected between various ECUs and sensors, these DTCs are stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0123 Lost Communication with Yaw Rate Sensor Module 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 communication error between the yaw rate sensor (airbag sensor assembly) and forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • Yaw rate sensor (Airbag sensor assembly)

  • Forward recognition camera
U0129 Lost Communication with Brake System Control Module After the engine switch is turned on (IG) for 3 seconds or more, a communication error between the skid control ECU (brake actuator assembly) and forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • Skid control ECU (Brake actuator assembly)

  • Forward recognition camera

PROCEDURE


  1. 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 U0123 and U0129 are not output A
      DTC U0123 or U0129 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM Click here