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Home >> Lexus >> 2019 >> LC 500 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Ext) - Diagnostic Codes, Symptom & Circuit Tests (1 Of 2) (Coupe) >> Lighting 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; DTC U0129: Lost Communication with Brake System Control Module; DTC U0130: Lost Communication with Steering Effort Control Module; DTC U0132: Lost Communication with Suspension Control ECU; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0168: Lost Communication with Vehicle Security Control Module; DTC U0182: Lost Communication With Lighting Control Module Front; DTC U023A: Lost Communication with Front Camera Module; DTC U0242: Lost Communication With Headlamp Control Module "B" [03/2017 - ] >> 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; DTC U0129: Lost Communication with Brake System Control Module; DTC U0130: Lost Communication with Steering Effort Control Module; DTC U0132: Lost Communication with Suspension Control ECU; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0168: Lost Communication with Vehicle Security Control Module; DTC U0182: Lost Communication With Lighting Control Module Front; DTC U023A: Lost Communication with Front Camera Module; DTC U0242: Lost Communication With Headlamp Control Module "B" [03/2017 - ]: Description

These DTCs are stored when the CAN communication system is malfunctioning.

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 does not send/receive data. CAN communication system HL AutoLeveling
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
 HL AutoLeveling
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
 HL AutoLeveling
U0126 Lost Communication with Steering Angle Sensor The No. 1 headlight ECU sub-assembly does not receive data from the steering sensor for approximately 10 seconds or more.
  • CAN communication system
  • Steering sensor
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling
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 assembly for approximately 10 seconds or more.
  • CAN communication system
  • Skid control ECU assembly
  • No. 1 headlight ECU sub-assembly LH
 HL AutoLeveling
U0130 Lost Communication with Steering Effort Control Module The No. 1 headlight ECU sub-assembly LH does not receive data from the front steering control ECU for approximately 10 seconds or more
  • CAN communication system
  • Front steering control ECU
  • No. 1 headlight ECU sub-assembly LH
 HL AutoLeveling
U0132 Lost Communication with Suspension Control ECU The No. 1 headlight ECU sub-assembly LH does not receive data from the absorber control ECU for approximately 10 seconds or more
  • CAN communication system
  • Absorber control ECU
  • No. 1 headlight ECU sub-assembly LH
 HL AutoLeveling
U0142 Lost Communication with Body Control Module "B" The No. 1 headlight ECU sub-assembly 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
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling
U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module The No. 1 headlight ECU sub-assembly does not receive data from the combination meter assembly circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling
U0168 Lost Communication with Vehicle Security Control Module The No. 1 headlight ECU sub-assembly LH does not receive data from the certification ECU (smart key ECU assembly) circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Certification ECU (smart key ECU assembly)
  • No. 1 headlight ECU sub-assembly LH
 HL AutoLeveling
U0182 Lost Communication With Lighting Control Module Front The No. 1 headlight ECU sub-assembly RH does not receive data from the No. 1 headlight ECU sub-assembly LH circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling (Sub)
U023A Lost Communication with Front Camera Module The main body ECU (multiplex network body ECU) does not receive data from the forward recognition camera for approximately 10 seconds or more.
  • CAN communication system
  • Forward recognition camera
  • Main body ECU (multiplex network body ECU)
 Main Body
U0242 Lost Communication With Headlamp Control Module "B" The No. 1 headlight ECU sub-assembly LH does not receive data from the No. 1 headlight ECU sub-assembly RH circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling
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 does not send/receive data. CAN communication system HL AutoLeveling (Sub)
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
 HL AutoLeveling
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
 HL AutoLeveling
U0126 Lost Communication with Steering Angle Sensor The No. 1 headlight ECU sub-assembly does not receive data from the steering sensor for approximately 10 seconds or more.
  • CAN communication system
  • Steering sensor
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling (Sub)
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 assembly for approximately 10 seconds or more.
  • CAN communication system
  • Skid control ECU assembly
  • No. 1 headlight ECU sub-assembly LH
 HL AutoLeveling
U0130 Lost Communication with Steering Effort Control Module The No. 1 headlight ECU sub-assembly LH does not receive data from the front steering control ECU for approximately 10 seconds or more
  • CAN communication system
  • Front steering control ECU
  • No. 1 headlight ECU sub-assembly LH
 HL AutoLeveling
U0132 Lost Communication with Suspension Control ECU The No. 1 headlight ECU sub-assembly LH does not receive data from the absorber control ECU for approximately 10 seconds or more
  • CAN communication system
  • Absorber control ECU
  • No. 1 headlight ECU sub-assembly LH
 HL AutoLeveling
U0142 Lost Communication with Body Control Module "B" The No. 1 headlight ECU sub-assembly 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
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling (Sub)
U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module The No. 1 headlight ECU sub-assembly does not receive data from the combination meter assembly circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling (Sub)
U0168 Lost Communication with Vehicle Security Control Module The No. 1 headlight ECU sub-assembly LH does not receive data from the certification ECU (smart key ECU assembly) circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Certification ECU (smart key ECU assembly)
  • No. 1 headlight ECU sub-assembly LH
 HL AutoLeveling
U0182 Lost Communication With Lighting Control Module Front The No. 1 headlight ECU sub-assembly RH does not receive data from the No. 1 headlight ECU sub-assembly LH circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling (Sub)
U023A Lost Communication with Front Camera Module The main body ECU (multiplex network body ECU) does not receive data from the forward recognition camera for approximately 10 seconds or more.
  • CAN communication system
  • Forward recognition camera
  • Main body ECU (multiplex network body ECU)
 Main Body
U0242 Lost Communication With Headlamp Control Module "B" The No. 1 headlight ECU sub-assembly LH does not receive data from the No. 1 headlight ECU sub-assembly RH circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
 HL AutoLeveling
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