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Home >> Toyota >> 2019 >> Mirai >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Ext) - Diagnostic Codes & Circuit Tests >> Lighting System >> DTC B2439: Headlamp LH Circuit; DTC B243A: Headlamp RH Circuit [06/2015 - ] >> Description

DTC B2439: Headlamp LH Circuit; DTC B243A: Headlamp RH Circuit [06/2015 - ]: Description

This DTC is output when the headlight light control ECU sub-assembly receives an abnormal signal from the headlight unit.

The headlight light control ECU sub-assembly LH outputs DTC B2439 and B243A

DTC No. Detection Item DTC Detection Condition Trouble Area
B2439 Headlamp LH Circuit Headlight light control ECU sub-assembly LH light source malfunction
  • Headlight light control ECU sub-assembly LH
  • Headlight unit LH
  • Headlight unit Assembly LH
B243A Headlamp RH Circuit Headlight light control ECU sub-assembly RH light source malfunction
  • Headlight light control ECU sub-assembly RH
  • Headlight unit RH
  • Headlight unit Assembly RH