DTC B124B: Automatic High Beam System [01/2019 - 09/2022]: Description

WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, and 2020 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

The main body ECU (multiplex network body ECU) determines the status of the automatic high beam system based on the automatic high beam system signal from the forward recognition camera.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
B124B	Automatic High Beam System	Malfunction in automatic high beam system	Front camera system Dynamic radar cruise control system Lane control system Road sign assist system* Pre-collision system Hybrid control system Electronically controlled brake system CAN communication system Forward recognition camera Main body ECU (multiplex network body ECU)	Main Body

*: w/ Road Sign Assist System