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Home >> Lexus >> 2015 >> IS 250 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Lane Departure Alert System - Diagnostic Codes & Circuit Tests >> Lane Departure Alert System >> DTC U0101: Lost Communication with TCM; DTC U0104: Lost Communication with Cruise Control Module; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter) [04/2013 - 10/2016] >> Description
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DTC U0101: Lost Communication with TCM; DTC U0104: Lost Communication with Cruise Control Module; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter) [04/2013 - 10/2016]: Description

These DTCs are output when a communication malfunction occurs between the sensors and ECUs.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0101 Lost Communication with TCM While the vehicle is being driven at 1 km/h or 1 mph or more, communication between the ECM and lane departure warning camera stops for 5 seconds or more.
  • CAN communication system
  • ECM
  • Lane departure warning camera
U0104 Lost Communication with Cruise Control Module While the engine switch is on (IG), communication between the driving support ECU and lane departure warning camera stops for 5 seconds or more.
  • CAN communication system
  • Driving support ECU assembly
  • Lane departure warning camera
U0123 Lost Communication with Yaw Rate Sensor Module While the vehicle is being driven at 1 km/h or 1 mph or more, communication between the yaw rate sensor and lane departure warning camera stops for 5 seconds or more.
  • CAN communication system
  • Yaw rate sensor
  • Lane departure warning camera
U0129 Lost Communication with Brake System Control Module While the engine switch is on (IG), communication between the skid control ECU and lane departure warning camera stops for 5 seconds or more.
  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
  • Lane departure warning camera
U0142 Lost Communication with Body Control Module "B" While the engine switch is on (IG), communication between the main body ECU (multiplex network body ECU) and lane departure warning camera stops for 5 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Lane departure warning camera
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter) While the engine switch is on (IG), communication between the combination meter assembly and lane departure warning camera stops for 50 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • Lane departure warning camera
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