PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U0100, U0125, U0126, U0129, U0235, U023A, U1002, U1104

DTC Code DTC Name
U0100 Lost Communication with ECM
U0125 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
U0129 Lost Communication with Brake System Control Module
U0235 Lost Communication with Cruise Control Front Distance Range Sensor
U023A Lost Communication with Front Camera Module
U1002 Lost Communication with Gateway Module (Pre-Crash2)
U1104 Lost Communication with Driving Support ECU

DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle. Based on this information, the driving support ECU assembly sends pre-crash control operation signals. These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect crashes, or between ECUs that perform the pre-crash control.

The driving support ECU assembly, millimeter wave radar sensor assembly and forward recognition camera are connected via CAN communication lines. If communication with the millimeter wave radar sensor assembly or forward recognition camera stops, the driving support ECU assembly will store DTC U1002.

The driving support ECU assembly is connected to the millimeter wave radar sensor assembly, forward recognition camera and brake actuator assembly (skid control ECU) via CAN communication. If communication with the millimeter wave radar sensor assembly, forward recognition camera or brake actuator assembly (skid control ECU) stops, the driving support ECU assembly stores DTC U1104.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0100 Lost Communication with ECM While the ignition switch is ON, a communication error between the ECM and the driving support ECU assembly is detected for approximately 5 seconds.

  • CAN communication system

  • ECM

  • Driving support ECU assembly
U0125 Lost Communication with Yaw Rate Sensor Module While the ignition switch is ON, a communication error between the airbag sensor assembly and the driving support ECU assembly is detected for approximately 1 second.

  • CAN communication system

  • Airbag sensor assembly

  • Driving support ECU assembly
U0126 Lost Communication with Steering Angle Sensor Module While the ignition switch is ON, a communication error between the spiral with sensor cable sub-assembly (steering angle sensor) and the driving support ECU assembly is detected for approximately 4 seconds.

  • CAN communication system

  • Spiral with sensor cable sub-assembly

  • Driving support ECU assembly
U0129 Lost Communication with Brake System Control Module While the ignition switch is ON, a communication error between the brake actuator assembly (skid control ECU) and the driving support ECU assembly is detected for approximately 3 seconds.

  • CAN communication system

  • Brake actuator assembly (skid control ECU)

  • Driving support ECU assembly
U0235 Lost Communication with Cruise Control Front Distance Range Sensor While the ignition switch is ON, a communication error between the millimeter wave radar sensor assembly and the driving support ECU assembly is detected for approximately 1 second.

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly
U023A Lost Communication with Front Camera Module While the ignition switch is ON, a communication error between the forward recognition camera and the driving support ECU assembly is detected for approximately 2 seconds.

  • CAN communication system

  • Forward recognition camera

  • Driving support ECU assembly
U1002 Lost Communication with Gateway Module (Pre-Crash2) While the ignition switch is ON, a communication error between the millimeter radar sensor assembly and driving support ECU assembly or the forward recognition camera and driving support ECU assembly is detected for approximately 2 seconds or more.

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Forward recognition camera

  • Driving support ECU assembly
U1104 Lost Communication with Driving Support ECU

  • While the ignition switch is ON, a communication error between the millimeter wave radar sensor assembly and the driving support ECU assembly is detected for approximately 0.2 second.

  • While the ignition switch is ON, a communication error between the forward recognition camera and the driving support ECU assembly is detected for approximately 0.2 seconds.

  • While the ignition switch is ON, a communication error between the brake actuator assembly (skid control ECU) and the driving support ECU assembly is detected for approximately 1.5 seconds.

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Forward recognition camera

  • Brake actuator assembly (skid control ECU)

  • Driving support ECU assembly

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Crash 2 > Clear DTCs

    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 the DTCs.

      Click here


      Body Electrical > Pre-Crash 2 > Trouble Codes
      OK
      DTC U0100, U0125, U0126, U0235, U023A, U1002 and U1104 are not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    GO TO CAN COMMUNICATION SYSTEM for LHD: Click here
    GO TO CAN COMMUNICATION SYSTEM for RHD: Click here