LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2017 >> RC 350 Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Lighting System (Ext) - Diagnostic Codes & Circuit Tests) >> Lighting System >> DTC U0242: Lost Communication With Headlamp Control Module "B" [10/2018 - ] >> Description

DTC U0242: Lost Communication With Headlamp Control Module "B" [10/2018 - ]: Description

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2024 Lexus RC 350, 2024 Lexus RC 300, 2023 Lexus RC 350, 2023 Lexus RC 300, and 2022 Lexus RC 350. However, it is still accessible from the selected car via links, so may be relevant.

The No. 1 headlight ECU sub-assembly LH stores this DTC when the No. 1 headlight ECU sub-assembly RH detects an internal malfunction or if a communication malfunction occurs between No. 1 headlight ECU sub-assembly LH and No. 1 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:
  • No. 1 headlight ECU sub-assembly RH internal malfunction
  • Communication malfunction occurs between No. 1 headlight ECU sub-assembly LH and No. 1 headlight ECU sub-assembly RH for 10 seconds or more
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
  • Harness or connector
HL AutoLeveling