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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting System (W/ AFS) - Diagnostic Codes (1 Of 2) >> LIGHTING SYSTEM (w/ AFS) >> DTC B242C: Right Headlight ECU Malfunction; DTC B242D: Left Headlight ECU Malfunction [12/2019 - 11/2023] >> Description

DTC B242C: Right Headlight ECU Malfunction; DTC B242D: Left Headlight ECU Malfunction [12/2019 - 11/2023]: Description

The headlight ECU sub-assembly LH or headlight ECU sub-assembly RH 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 ignition switch is ON.

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 ignition switch is ON.

Malfunction status: 

  1. Headlight ECU sub-assembly LH internal malfunction

Malfunction duration: 

  1. Maximum 15 minutes
Headlight ECU sub-assembly LH AFS