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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 B2439: Headlight LH Circuit; DTC B243A: Headlight RH Circuit [10/2018 - ] >> Description

DTC B2439: Headlight LH Circuit; DTC B243A: Headlight RH Circuit [10/2018 - ]: Description

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A DTC is stored when the No. 1 headlight ECU sub-assembly LH or RH receives a light source malfunction signal from its respective headlight unit.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B2439 Headlight LH Circuit No. 1 headlight ECU sub-assembly LH light source malfunction
  • Headlight unit LH
  • No. 1 headlight ECU sub-assembly LH
HL AutoLeveling
B243A Headlight RH Circuit No. 1 headlight ECU sub-assembly RH light source malfunction
  • Headlight unit RH
  • No. 1 headlight ECU sub-assembly RH
HL AutoLeveling