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Home >> Lexus >> 2019 >> GS F >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Lane Keeping Assist System (Diagnostic Codes & Circuit Tests) >> Lane-Keeping Assist System >> DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0101: Lost Communication With TCM; DTC U0123: 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 U0131: Lost Communication with Power Steering Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Combination Meter [09/2017 - ] >> Description

DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0101: Lost Communication With TCM; DTC U0123: 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 U0131: Lost Communication with Power Steering Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Combination Meter [09/2017 - ]: Description

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

DTC No. Detection Item DTC Detection Condition Trouble Area
U0100 Lost Communication With ECM/PCM "A" While the vehicle is being driven at 1 km/h or 1 mph or more, a communication error between the ECM and the forward recognition camera is detected for approximately 5 seconds or more.
  • CAN communication system
  • ECM
  • Forward recognition camera
U0101 Lost Communication With TCM While the vehicle is being driven at 1 km/h or 1 mph or more, a communication error between the ECM and the forward recognition camera is detected for approximately 5 seconds or more.
  • CAN communication system
  • ECM
  • Forward recognition camera
U0123 Lost Communication with Yaw Rate Sensor Module While the vehicle is being driven at 1 km/h or 1 mph or more, a communication error between the acceleration sensor (yaw rate sensor) and the forward recognition camera is detected for approximately 5 seconds or more.
  • CAN communication system
  • Acceleration sensor (yaw rate sensor)
  • Forward recognition camera
U0126 Lost Communication with Steering Angle Sensor Module 2 seconds after the engine switch is turned on (IG), a communication error between the steering angle sensor (spiral with sensor cable sub-assembly) and the forward recognition camera is detected for approximately 5 seconds or more.
  • CAN communication system
  • Steering angle sensor (spiral with sensor cable sub-assembly)
  • Forward recognition camera
U0129 Lost Communication with Brake System Control Module 2 seconds after the engine switch is turned on (IG), a communication error between the skid control ECU (brake actuator assembly) and the forward recognition camera is detected for approximately 5 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Forward recognition camera
U0131 Lost Communication with Power Steering Control Module 2 seconds after the engine switch is turned on (IG), a communication error between the power steering ECU assembly and the forward recognition camera is detected for approximately 5 seconds or more.
  • CAN communication system
  • Power steering ECU assembly
  • Forward recognition camera
U0142 Lost Communication with Body Control Module "B" 2 seconds after the engine switch is turned on (IG), a communication error between the main body ECU (multiplex network body ECU) and the forward recognition camera is detected for approximately 5 seconds or more.
  • CAN communication system
  • Main body ECU (Multiplex network body ECU)
  • Forward recognition camera
U0155 Lost Communication with Combination Meter 2 seconds after the engine switch is turned on (IG), a communication error between the combination meter assembly and the forward recognition camera is detected for approximately 50 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • Forward recognition camera
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