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Home >> Toyota >> 2021 >> Highlander LE, FWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ AFS) - Diagnostic Codes (1 Of 2) >> LIGHTING SYSTEM (w/ AFS) >> 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; DTC U0242: Lost Communication With Headlamp Control Module "B"; DTC U0293: Lost Communication With Hybrid Vehicle Control System [12/2019 - 11/2023] >> 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; DTC U0242: Lost Communication With Headlamp Control Module "B"; DTC U0293: Lost Communication With Hybrid Vehicle Control System [12/2019 - 11/2023]: Description

These DTCs are stored if a CAN communication malfunction occurs between the 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 headlight ECU sub-assembly LH does not send/receive data. CAN communication system AFS
U0100 Lost Communication With ECM/PCM "A" The headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.
  • CAN communication system
  • ECM
 AFS
U0101 Lost Communication with TCM for HV Model: 
  1. The headlight ECU sub-assembly LH does not receive data from the hybrid vehicle control ECU for approximately 10 seconds or more.

for Gasoline Model: 

  1. The headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.
 for HV Model: 
  • CAN communication system
  • Hybrid vehicle control ECU

for Gasoline Model: 

  • CAN communication system
  • ECM
 AFS
U0126 Lost Communication with Steering Angle Sensor Module The headlight ECU sub-assembly LH does not receive data from the steering sensor for approximately 10 seconds or more.
  • CAN communication system
  • Steering sensor
 AFS
U0129 Lost Communication with Brake System Control Module for HV Model: 
  1. The headlight ECU sub-assembly LH does not receive data from the No. 2 skid control ECU (brake actuator assembly) for approximately 10 seconds or more.

for Gasoline Model: 

  1. The headlight ECU sub-assembly LH does not receive data from the skid control ECU (brake actuator assembly) for approximately 10 seconds or more.
 for HV Model: 
  • CAN communication system
  • No. 2 skid control ECU (brake actuator assembly)

for Gasoline Model: 

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
 AFS
U0142 Lost Communication with Body Control Module "B" The 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)
 AFS
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The 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
 AFS
U0242 Lost Communication With Headlamp Control Module "B" The headlight ECU sub-assembly LH does not receive data from the headlight ECU sub-assembly RH for approximately 10 seconds or more.
  • CAN communication system
  • Headlight ECU sub-assembly RH
 AFS
U0293 Lost Communication With Hybrid Vehicle Control System The headlight ECU sub-assembly LH does not receive data from the hybrid vehicle control ECU for approximately 10 seconds or more.
  • CAN communication system
  • Hybrid vehicle control ECU
 AFS
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