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Home >> Toyota >> 2017 >> Mirai >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Ext) - Diagnostic Codes & Circuit Tests >> Lighting System >> DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with EV ECU; 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 U0293: Lost Communication with Hybrid Vehicle Control System [06/2015 - ] >> Description
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DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with EV ECU; 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 U0293: Lost Communication with Hybrid Vehicle Control System [06/2015 - ]: Description

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

DTC No. Detection Item DTC Detection Condition Trouble Area
U0073 Control Module Communication Bus OFF Lost communication with CAN communication line CAN communication system
U0100 Lost Communication with EV ECU Lost Communication with EV ECU
  • CAN communication system
  • EV control ECU
U0101 Lost Communication with TCM
  • 3 seconds or more elapse after turning the power switch on (IG).
  • The headlight light control ECU sub-assembly LH power supply voltage is 9.5 V or higher.
  • CAN communication system
  • EV control ECU
  • Lane departure warning camera
U0126 Lost Communication with Steering Angle Sensor Module
  • 3 seconds or more elapse after turning the power switch on (IG).
  • The headlight light control ECU sub-assembly LH power supply voltage is 9.5 V or higher.
  • CAN communication system
  • Power steering ECU assembly
U0129 Lost Communication with Brake System Control Module
  • 3 seconds or more elapse after turning the power switch on (IG).
  • The headlight light control ECU sub-assembly LH power supply voltage is 9.5 V or higher.
  • CAN communication system
  • Brake booster with master cylinder assembly
U0142 Lost Communication with Body Control Module "B"
  • 3 seconds or more elapse after turning the power switch on (IG).
  • The headlight light control ECU sub-assembly LH power supply voltage is 9.5 V or higher.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module
  • 3 seconds or more elapse after turning the power switch on (IG).
  • The headlight light control ECU sub-assembly LH power supply voltage is 9.5 V or higher.
  • CAN communication system
  • Combination meter assembly
U0293 Lost Communication with Hybrid Vehicle Control System
  • 3 seconds or more elapse after turning the power switch on (IG).
  • The headlight light control ECU sub-assembly LH power supply voltage is 9.5 V or higher.
  • CAN communication system
  • EV control ECU
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