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Home >> Lexus >> 2021 >> UX 200 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Exterior) (Diagnostic Codes) (1 Of 2) >> Lighting System >> DTC B2430: LED Headlight LH; DTC B2431: LED Headlight RH [10/2018 - 07/2022] >> Description

DTC B2430: LED Headlight LH; DTC B2431: LED Headlight RH [10/2018 - 07/2022]: Description

These DTCs are stored when the low beam headlights do not illuminate, or a communication malfunction is detected between the light control LED ECU and main body ECU (multiplex network body ECU).

HINT: 

DTC B2430 or DTC B2431 may also be stored if a headlight cooling fan is malfunctioning. In this case, the light control LED ECU will dim or turn off the malfunctioning low beam headlight.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B2430 LED Headlight LH Detection condition: 
  1. All of the following conditions are met:
    • Power switch on (RELAY) (for HV Model)
    • Engine running (for Gasoline Model)
    • Low beam headlights on

Malfunction Status: 
  1. Any of the following conditions is met:
    • Light control LED ECU malfunction
    • Headlight assembly LH malfunction
    • Light control LED ECU power source and signal malfunction

Malfunction Time: 
  1. 10 seconds or more
  • Headlight assembly LH
  • H-LP LH relay
  • Instrument panel junction block assembly
  • Main body ECU (multiplex network body ECU)
  • Harness or connector
 Main Body
B2431 LED Headlight RH Detection condition: 
  1. All of the following conditions are met:
    • Power switch on (RELAY) (for HV Model)
    • Engine running (for Gasoline Model)
    • Low beam headlights on

Malfunction Status: 
  1. Any of the following conditions is met:
    • Light control LED ECU malfunction
    • Headlight assembly RH malfunction
    • Light control LED ECU power source and signal malfunction

Malfunction Time: 
  1. 10 seconds or more
  • Headlight assembly RH
  • H-LP RH relay
  • Main body ECU (multiplex network body ECU)
  • Harness or connector
 Main Body
DTC DETECTION CONDITIONS (B2430):

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition Power switch on (RELAY)*1 ◦ ◦ ◦
Engine running*2 ◦ ◦ ◦
Low beam headlights on ◦ ◦ ◦
Malfunction Status Light control LED ECU malfunction ◦ - -
Headlight assembly LH malfunction - ◦ -
Light control LED ECU power source and signal malfunction - - ◦
Detection Time 10 seconds or more 10 seconds or more 10 seconds or more
Number of Trips - - -
  1. *1: for HV Model
  2. *2: for Gasoline Model
DTC DETECTION CONDITIONS (B2431):

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition Power switch on (RELAY)*1 ◦ ◦ ◦
Engine running*2 ◦ ◦ ◦
Low beam headlights on ◦ ◦ ◦
Malfunction Status Light control LED ECU malfunction ◦ - -
Headlight assembly RH malfunction - ◦ -
Light control LED ECU power source and signal malfunction - - ◦
Detection Time 10 seconds or more 10 seconds or more 10 seconds or more
Number of Trips - - -
  1. *1: for HV Model
  2. *2: for Gasoline Model

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.

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