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Home >> Lexus >> 2024 >> RC F Track Edition >> Repair and Diagnosis (Single Page) >> Restraints >> Restraints Control Systems >> Pre-Collision System - Diagnostic Codes (2 Of 2) & Circuit Tests >> Pre-Collision System >> DTC U0100: Lost Communication with ECM / PCM "A"; 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 U0142: Lost Communication with Body Control Module "B"; DTC U1002: Lost Communication with Gateway Module [09/2014 - 11/2017] >> Description
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DTC U0100: Lost Communication with ECM / PCM "A"; 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 U0142: Lost Communication with Body Control Module "B"; DTC U1002: Lost Communication with Gateway Module [09/2014 - 11/2017]: 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.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0100 Lost Communication with ECM / PCM "A" While the vehicle speed is 5 km/h (3 mph) or more, a communication error between the ECM and the driving support ECU assembly is detected for 4 seconds or more.
  • CAN communication system
  • ECM
  • Driving support ECU assembly
U0125 Lost Communication with Yaw Rate Sensor Module When the engine switch is on (IG), a communication error between the yaw rate sensor and the driving support ECU assembly is detected for 4 seconds or more.
  • CAN communication system
  • Yaw rate sensor
  • Driving support ECU assembly
U0126 Lost Communication with Steering Angle Sensor Module When the engine switch is on (IG), a communication error between the spiral with sensor cable sub-assembly (steering angle sensor) and the driving support ECU assembly is detected for 5 seconds or more.
  • CAN communication system
  • Spiral with sensor cable sub-assembly (steering angle sensor)
  • Driving support ECU assembly
U0129 Lost Communication with Brake System Control Module When the engine switch is on (IG), a communication error between the brake actuator assembly (skid control ECU) and the driving support ECU assembly is detected for 8 seconds or more.
  • CAN communication system
  • Brake actuator assembly (skid control ECU)
  • Driving support ECU assembly
U0142 Lost Communication with Body Control Module "B" When the engine switch is on (IG), a communication error between the main body ECU (multiplex network body ECU) and driving support ECU assembly is detected for 16 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Driving support ECU assembly
U1002 Lost Communication with Gateway Module When the engine switch is on (IG), a communication error between the millimeter wave radar sensor assembly and driving support ECU assembly is detected for 2 seconds or more.
  • CAN communication system
  • Millimeter wave radar sensor assembly
  • Driving support ECU assembly
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