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Home >> Lexus >> 2017 >> RC F >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Lighting System (Ext) - Diagnostic Codes & Circuit Tests) >> Lighting System >> DTC U0242: Lost Communication With Headlamp Control Module "B" [03/2019 - ] >> Description

DTC U0242: Lost Communication With Headlamp Control Module "B" [03/2019 - ]: Description

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The headlight ECU sub-assembly LH stores this DTC when the headlight ECU sub-assembly RH detects an internal malfunction or if a communication malfunction occurs between headlight ECU sub-assembly LH and headlight ECU sub-assembly RH for 10 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U0242 Lost Communication With Headlamp Control Module "B" Either of the following conditions is met:
  • Headlight ECU sub-assembly RH internal malfunction
  • Communication malfunction occurs between headlight ECU sub-assembly LH and headlight ECU sub-assembly RH for 10 seconds or more
  • Headlight ECU sub-assembly LH
  • Headlight ECU sub-assembly RH
  • Harness or connector
HL AutoLeveling