DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction [04/2013 - 10/2016]: Description

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2024 Lexus IS 500, 2024 Lexus IS 350, 2024 Lexus IS 300, 2023 Lexus IS 500, and 2023 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

These DTCs are stored when the low beam headlights do not illuminate, or a communication malfunction is detected between the headlight assembly 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 20 seconds have elapsed since the engine switch was turned on (IG): Light control ECU malfunction Headlight unit malfunction Light control ECU power source and signal malfunction	Light control ECU LH Headlight unit LH 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 20 seconds have elapsed since the engine switch was turned on (IG): Light control ECU malfunction Headlight unit malfunction Light control ECU power source and signal malfunction	Light control ECU RH Headlight unit RH Semiconductor pwr integration ECU Instrument panel junction block assembly Main body ECU (multiplex network body ECU) Harness or connector