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Home >> Lexus >> 2021 >> RX 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> HEADUP Display System - Diagnostic Codes & Circuit Tests >> HEADUP Display System >> DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0163: Lost Communication with Navigation Control Module; DTC U023A: Lost Communication with Front Camera Module [08/2019 - ] >> Description
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DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0163: Lost Communication with Navigation Control Module; DTC U023A: Lost Communication with Front Camera Module [08/2019 - ]: Description

The headup display (meter mirror sub-assembly) communicates with the ECM, main body ECU (multiplex network body ECU), radio receiver assembly and forward recognition camera via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
U0100 Lost Communication with ECM / PCM "A" Diagnosis Condition:
  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:
  1. No communication with ECM

Malfunction Time:
  1. 2 seconds or more
  • ECM
  • CAN communication system
  • Headup display (Meter mirror sub-assembly)
DTC stored -
U0142 Lost Communication with Body Control Module "B" Diagnosis Condition:
  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:
  1. No communication with main body ECU (multiplex network body ECU)

Malfunction Time:
  1. 3 seconds or more
  • Main body ECU (multiplex network body ECU)
  • CAN communication system
  • Headup display (Meter mirror sub-assembly)
DTC stored -
U0163 Lost Communication with Navigation Control Module Diagnosis Condition:
  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:
  1. No communication with radio receiver assembly

Malfunction Time:
  1. 3 seconds or more
  • Radio receiver assembly
  • CAN communication system
  • Headup display (Meter mirror sub-assembly)
- -
U023A Lost Communication with Front Camera Module Diagnosis Condition:
  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:
  1. 10 seconds or more
  • Forward recognition camera
  • CAN communication system
  • Headup display (Meter mirror sub-assembly)
DTC stored -