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Home >> Lexus >> 2021 >> RX 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ Automatic Headlight Beam Level Control System) - Diagnostic Codes >> LIGHTING SYSTEM (w/ Automatic Headlight Beam Level Control System) >> DTC U0073: Control Module Communication Bus 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 [08/2019 - ] >> Description
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DTC U0073: Control Module Communication Bus 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 [08/2019 - ]: Description

These DTCs are stored if a CAN communication malfunction occurs between the No. 1 headlight ECU sub-assembly LH and other ECUs.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U0073 Control Module Communication Bus Off The No. 1 headlight ECU sub-assembly LH does not send/receive data. CAN communication system No. 1 headlight ECU sub-assembly LH
U0100 Lost Communication With ECM/PCM "A" The No. 1 headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.
  • CAN communication system
  • ECM
 No. 1 headlight ECU sub-assembly LH
U0101 Lost Communication with TCM The No. 1 headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.
  • CAN communication system
  • ECM
 No. 1 headlight ECU sub-assembly LH
U0126 Lost Communication with Steering Angle Sensor Module The No. 1 headlight ECU sub-assembly LH does not receive data from the steering sensor for approximately 5 seconds or more.
  • CAN communication system
  • Steering sensor
 No. 1 headlight ECU sub-assembly LH
U0129 Lost Communication with Brake System Control Module The No. 1 headlight ECU sub-assembly LH does not receive data from the skid control ECU (brake actuator assembly) for approximately 5 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
 No. 1 headlight ECU sub-assembly LH
U0142 Lost Communication with Body Control Module "B" The No. 1 headlight ECU sub-assembly LH does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
 No. 1 headlight ECU sub-assembly LH
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The No. 1 headlight ECU sub-assembly LH does not receive data from the combination meter assembly for approximately 30 seconds or more.
  • CAN communication system
  • Combination meter assembly
 No. 1 headlight ECU sub-assembly LH
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