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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Lighting System (Ext) - Diagnostic Codes & Circuit Tests) >> Lighting System >> DTC B242C: Right Headlight ECU Malfunction; DTC B242D: Left Headlight ECU Malfunction [09/2020 - ] >> Description

DTC B242C: Right Headlight ECU Malfunction; DTC B242D: Left Headlight ECU Malfunction [09/2020 - ]: Description

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

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
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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