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Home >> Lexus >> 2021 >> NX 300 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ Headlight Ecu) - Diagnostic Codes & Symptom Tests >> LIGHTING SYSTEM (w/ Headlight ECU) >> DTC U0073: Control Module Communication Bus "A" Off; DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0101: Lost Communication with TCM; 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 U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module [09/2017 - ] >> Description
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DTC U0073: Control Module Communication Bus "A" Off; DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0101: Lost Communication with TCM; 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 U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module [09/2017 - ]: Description

DTC No. Detection Item DTC Detection Condition Trouble Area
U0073 Control Module Communication Bus "A" Off Bus off condition is detected. CAN communication system
U0100 Lost Communication with ECM / PCM "A" Communication stop occurs between the headlight ECU sub-assembly LH and ECM continuously for 10 seconds or more.
  • CAN communication system
  • ECM
  • Headlight ECU sub-assembly LH
U0101 Lost Communication with TCM Communication stop occurs between the headlight ECU sub-assembly LH and ECM continuously for 10 seconds or more.
  • CAN communication system
  • ECM
  • Headlight ECU sub-assembly LH
U0126 Lost Communication with Steering Angle Sensor Module Communication stop occurs between the headlight ECU sub-assembly LH and steering sensor continuously for 10 seconds or more.
  • CAN communication system
  • Steering sensor
  • Headlight ECU sub-assembly LH
U0129 Lost Communication with Brake System Control Module Communication stop occurs between the headlight ECU sub-assembly LH and brake actuator assembly (skid control ECU) continuously for 10 seconds or more.
  • CAN communication system
  • Brake actuator assembly (skid control ECU)
  • Headlight ECU sub-assembly LH
U0142 Lost Communication with Body Control Module "B" Communication stop occurs between the headlight ECU sub-assembly LH and main body ECU (multiplex network body ECU) continuously for 10 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Headlight ECU sub-assembly LH
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module Communication stop occurs between the headlight ECU sub-assembly LH and combination meter assembly continuously for 30 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • Headlight ECU sub-assembly LH
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