DTC B2430: LED Headlight LH; DTC B2431: LED Headlight RH [01/2019 - 03/2019]: Description

WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, 2020 Toyota Corolla, and 2019 Toyota Corolla. 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 light control 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 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: All of the following conditions are met: Engine running Low beam headlights on Malfunction Status: Any of the following conditions is met: Light control ECU malfunction Headlight unit assembly LH malfunction Light control ECU power source and signal malfunction Malfunction Time: 10 seconds or more	Headlight unit assembly LH No. 1 integration relay Instrument panel junction block assembly Main body ECU (multiplex network body ECU) Harness or connector	Main body ECU (multiplex network body ECU)
B2431	LED Headlight RH	Detection condition: All of the following conditions are met: Engine running Low beam headlights on Malfunction Status: Any of the following conditions is met: Light control ECU malfunction Headlight unit assembly RH malfunction Light control ECU power source and signal malfunction Malfunction Time: 10 seconds or more	Headlight unit assembly RH No. 1 integration relay Main body ECU (multiplex network body ECU) Harness or connector	Main body ECU (multiplex network body ECU)

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2430

LED Headlight LH

Detection condition:

All of the following conditions are met:
- Engine running
- Low beam headlights on

Malfunction Status:

Any of the following conditions is met:
- Light control ECU malfunction
- Headlight unit assembly LH malfunction
- Light control ECU power source and signal malfunction

Malfunction Time:

10 seconds or more

Headlight unit assembly LH
No. 1 integration relay
Instrument panel junction block assembly
Main body ECU (multiplex network body ECU)
Harness or connector

Main body ECU (multiplex network body ECU)

B2431

LED Headlight RH

Detection condition:

All of the following conditions are met:
- Engine running
- Low beam headlights on

Malfunction Status:

Any of the following conditions is met:
- Light control ECU malfunction
- Headlight unit assembly RH malfunction
- Light control ECU power source and signal malfunction

Malfunction Time:

10 seconds or more

Headlight unit assembly RH
No. 1 integration relay
Main body ECU (multiplex network body ECU)
Harness or connector

Main body ECU (multiplex network body ECU)