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Home >> Toyota >> 2022 >> RAV4 LE, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Lighting System (W/ Headlight Ecu W/O AFS) - Diagnostic Codes & Circuit Tests) >> LIGHTING SYSTEM (w/ Headlight ECU without 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 [11/2018 - 12/2021] >> Description

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 [11/2018 - 12/2021]: Description

WARNING: This page is about a different car, the 2021 Toyota RAV4, 2020 Toyota RAV4, and 2019 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

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
 HL AutoLeveling -
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
  • Headlight ECU sub-assembly LH
 HL AutoLeveling for Gasoline Model
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 assembly 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 assembly
  • Headlight ECU sub-assembly LH

for Gasoline Model: 
  • CAN communication system
  • ECM
  • Headlight ECU sub-assembly LH
 HL AutoLeveling -
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
 HL AutoLeveling -
U0129 Lost Communication with Brake System Control Module for HV Model: 
  1. 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.

for Gasoline Model: 
  1. The headlight ECU sub-assembly LH does not receive data from the brake actuator assembly (skid control ECU) for approximately 10 seconds or more.
 for HV Model: 
  • CAN communication system
  • Brake booster with master cylinder assembly (skid control ECU)
  • Headlight ECU sub-assembly LH

for Gasoline Model: 
  • CAN communication system
  • Brake actuator assembly (skid control ECU)
  • Headlight ECU sub-assembly LH
 HL AutoLeveling -
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
 HL AutoLeveling -
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
 HL AutoLeveling -
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
 HL AutoLeveling -
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
 HL AutoLeveling for HV Model
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