AUTOMATIC HIGH BEAM SYSTEM PROBLEM SYMPTOMS TABLE

Note

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.
When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning Click here.

Tech Tips

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Symptom	Suspected Area	See page
Automatic high beam indicator on the combination meter assembly does not illuminate	Check operating conditions	Click here
	Combination meter assembly	Click here
	Forward recognition camera	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Automatic high beam system does not operate	Check Data List (Auto H Beam STS)	Click here
	Automatic high beam switch circuit	Click here
	Headlight dimmer switch circuit	Click here
	Check automatic light control system operation	Click here
	Forward recognition camera power source circuit	Click here
	Forward recognition camera	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Tech Tips

Camera detection malfunctions can be detected using the GTS.
Aiming misalignment of the camera can be detected using the GTS. If the camera aiming is misaligned, check the following conditions:

Check if the vehicle is inclined.
Check if the windshield glass is installed correctly.
Check if the forward recognition camera is installed correctly.
Check if there is deformation of the forward recognition camera.