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Home >> Lexus >> 2018 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ Automatic Headlight Beam Level Control System) (Diagnostic Codes) (1 Of 2) >> LIGHTING SYSTEM (w/ Automatic Headlight Beam Level Control System) >> DTC B242C: Right Headlight ECU Malfunction; DTC B242D: Left Headlight ECU Malfunction [08/2019 - ] >> Description

DTC B242C: Right Headlight ECU Malfunction; DTC B242D: Left Headlight ECU Malfunction [08/2019 - ]: Description

The No. 1 headlight ECU sub-assembly LH stores a DTC if it detects an internal malfunction.

FOR MULTIPLE BEAM HEADLIGHT

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

Malfunction status: 
  1. No. 1 headlight ECU sub-assembly RH internal malfunction

Malfunction duration: 
  1. 10 seconds or more
 No. 1 headlight ECU sub-assembly RH AFS
B242D Left Headlight ECU Malfunction Detection condition: 
  1. The power switch is on (IG).

Malfunction status: 
  1. No. 1 headlight ECU sub-assembly LH internal malfunction

Malfunction duration: 
  1. -
 No. 1 headlight ECU sub-assembly LH AFS
FOR SINGLE BEAM HEADLIGHT

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

Malfunction status: 
  1. No. 1 headlight ECU sub-assembly RH internal malfunction

Malfunction duration: 
  1. 10 seconds or more
 No. 1 headlight ECU sub-assembly RH HL AutoLeveling
B242D Left Headlight ECU Malfunction Detection condition: 
  1. The power switch is on (IG).

Malfunction status: 
  1. No. 1 headlight ECU sub-assembly LH internal malfunction

Malfunction duration: 
  1. -
 No. 1 headlight ECU sub-assembly LH HL AutoLeveling
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