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Home >> Lexus >> 2018 >> RX 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/O Automatic Headlight Beam Level Control System) - Diagnostic Codes & Circuit Tests >> LIGHTING SYSTEM (w/o Automatic Headlight Beam Level Control System) >> DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction [09/2015 - 08/2019] >> Description
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DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction [09/2015 - 08/2019]: Description

  1. *1: for TMC Made
  2. *2: for TMMC Made

These DTCs are stored when the low beam headlights do not illuminate, or a communication malfunction is detected between the headlight unit*1 or headlight assembly*2 and main body ECU (multiplex network body ECU).

DTC No. Detection Item DTC Detection Condition Trouble Area
B2430 LED Headlight LH Circuit Malfunction Any of the following conditions occur after 12 seconds have elapsed since the engine switch was turned on (IG):
  • Headlight unit LH malfunction*1
  • Headlight unit LH power source and signal malfunction*1
  • Headlight assembly LH malfunction*2
  • Headlight assembly LH power source and signal malfunction*2
  • Headlight unit LH*1
  • Headlight assembly LH*2
  • Semiconductor pwr integration ECU
  • Instrument panel junction block assembly
  • Main body ECU (multiplex network body ECU)
  • Harness or connector
B2431 LED Headlight RH Circuit Malfunction Any of the following conditions occur after 12 seconds have elapsed since the engine switch was turned on (IG):
  • Headlight unit RH malfunction*1
  • Headlight unit RH power source and signal malfunction*1
  • Headlight assembly RH malfunction*2
  • Headlight assembly RH power source and signal malfunction*2
  • Headlight unit RH*1
  • Headlight assembly RH*2
  • Semiconductor pwr integration ECU
  • Instrument panel junction block assembly
  • Main body ECU (multiplex network body ECU)
  • Harness or connector