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Home >> Lexus >> 2021 >> ES 350 Luxury >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Ext) (Except Hybrid) - Diagnostic Codes (1 Of 2) >> LIGHTING SYSTEM (for Gasoline Model) >> DTC B242C: Right Headlight ECU Malfunction; DTC B242D: Left Headlight ECU Malfunction [06/2018 - ] >> Description

DTC B242C: Right Headlight ECU Malfunction; DTC B242D: Left Headlight ECU Malfunction [06/2018 - ]: Description

The headlight ECU sub-assembly LH or headlight ECU sub-assembly RH stores a DTC if it detects an internal malfunction.

FOR LED TYPE TURN SIGNAL LIGHT

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242C Right Headlight ECU Malfunction Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. Headlight ECU sub-assembly RH internal malfunction

Malfunction duration: 
  1. Maximum 15 minutes
 Headlight ECU sub-assembly RH AFS (Sub)
B242D Left Headlight ECU Malfunction Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. Headlight ECU sub-assembly LH internal malfunction

Malfunction duration: 
  1. Maximum 15 minutes
 Headlight ECU sub-assembly LH AFS
FOR BULB TYPE TURN SIGNAL LIGHT

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242C Right Headlight ECU Malfunction Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. Headlight ECU sub-assembly RH internal malfunction

Malfunction duration: 
  1. Maximum 15 minutes
 Headlight ECU sub-assembly RH HL AutoLeveling (Sub)
B242D Left Headlight ECU Malfunction Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. Headlight ECU sub-assembly LH internal malfunction

Malfunction duration: 
  1. Maximum 15 minutes
 Headlight ECU sub-assembly LH HL AutoLeveling
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