DTC U0125: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0140: Lost Communication with J/B ECU; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0151: Lost Communication with Airbag ECU; DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1002: Lost Communication with Gateway Module; DTC U1100: Lost Communication with Seat Belt Control ECU; DTC U1104: Lost Communication with Driving Support ECU [08/2014 - ]: 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-collision 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-collision control.

The driving support ECU assembly sends vehicle speed and vehicle condition information to the millimeter wave radar sensor assembly. The millimeter wave radar sensor assembly then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU assembly. The driving support ECU assembly sends this information to the ECM and performs pre-collision safety system operation (DTC U1104).

DTC No.	DTC Detection Condition	Trouble Area
U0125	When the engine switch is on (IG), a communication error between the airbag sensor assembly (yaw rate sensor) and the driving support ECU is detected for approximately 1 second.	Airbag sensor assembly (yaw rate sensor) CAN communication system Driving support ECU assembly Wire harness or connector
U0126	When the engine switch is on (IG), a communication error between the steering angle sensor and the driving support ECU assembly is detected for approximately 4 seconds.	CAN communication system Steering angle sensor Driving support ECU assembly Wire harness or connector
U0129	When the engine switch is on (IG), a communication error between the brake actuator assembly (skid control ECU) and the driving support ECU is detected for approximately 3 seconds. When the engine switch is on (IG), a communication error between the brake actuator assembly (skid control ECU) and the seat belt control ECU is detected for approximately 3 seconds.	Brake actuator assembly (skid control ECU) CAN communication system Seat belt control ECU Driving support ECU assembly Wire harness or connector
U0140	When the engine switch is on (IG), a communication error between the main body ECU and seat belt control ECU is detected for approximately 6 seconds.	CAN communication system Main body ECU (multiplex network body ECU) Seat belt control ECU Wire harness or connector
U0142	When the engine switch is on (IG), a communication error between the main body ECU and driving support ECU assembly is detected for approximately 14.2 seconds or more.	CAN communication system Main body ECU (multiplex network body ECU) Driving support ECU assembly Wire harness or connector
U0151	When the engine switch is on (IG), a communication error between the airbag sensor assembly and seat belt control ECU is detected for approximately 6 seconds.	CAN communication system Airbag sensor assembly Seat belt control ECU Wire harness or connector
U0235	When the engine switch is on (IG), 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 Wire harness or connector
U1002	When the engine switch is on (IG), a communication error between the millimeter wave radar sensor assembly and driving support ECU is detected for approximately 2 seconds.	Millimeter wave radar sensor assembly CAN communication system Driving support ECU assembly Wire harness or connector
U1100	When the engine switch is on (IG), a communication error between the seat belt control ECU and the driving support ECU assembly is detected for approximately 10 seconds.	CAN communication system Driving support ECU assembly Seat belt control ECU Wire harness or connector
U1104	When the engine switch is on (IG), a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 1 second. When the engine switch is on (IG), a communication error between the driving support ECU assembly and the network gateway ECU is detected for approximately 1 second. When the engine switch is on (IG), a communication error between the driving support ECU assembly and the seat belt control ECU is detected for approximately 1 second.	CAN communication system Millimeter wave radar sensor assembly Driving support ECU assembly Seat belt control ECU Wire harness or connector Network gateway ECU