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Home >> Toyota >> 2021 >> RAV4 Adventure >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ AFS) - Diagnostic Codes & Circuit Tests >> LIGHTING SYSTEM (w/ AFS) >> DTC U0073: Control Module Communication Bus Off; 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 [02/2019 - 12/2021] >> Description
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DTC U0073: Control Module Communication Bus Off; 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 [02/2019 - 12/2021]: 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 Note
U0073 Control Module Communication Bus Off The headlight ECU sub-assembly LH does not send/receive data.
  • CAN communication system
  • Headlight ECU sub-assembly LH
 AFS -
U0101 Lost Communication with TCM The headlight ECU sub-assembly LH does not receive data from the hybrid vehicle control ECU assembly for approximately 10 seconds or more.
  • CAN communication system
  • Hybrid vehicle control ECU assembly
  • Headlight ECU sub-assembly LH
 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
  • Headlight ECU sub-assembly LH
 AFS -
U0129 Lost Communication with Brake System Control Module The headlight ECU sub-assembly LH does not receive data from the brake booster with master cylinder assembly (skid control ECU) for approximately 10 seconds or more.
  • CAN communication system
  • Brake booster with master cylinder assembly (skid control ECU)
  • Headlight ECU sub-assembly LH
 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)
  • Headlight ECU sub-assembly LH
 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
  • Headlight ECU sub-assembly LH
 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
  • Headlight ECU sub-assembly LH
 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 assembly for approximately 10 seconds or more.
  • CAN communication system
  • Hybrid vehicle control ECU assembly
  • Headlight ECU sub-assembly LH
 AFS -
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