Problem Symptoms Table [03/2019 - ]

WARNING: This page is about a different car, the 2024 Lexus RC F, 2023 Lexus RC F, 2022 Lexus RC F, 2021 Lexus RC F, and 2020 Lexus RC F. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

Refer to INITIALIZATION [03/2019 - ]

HINT:

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.

AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

Symptom	Suspected Area	Link
Automatic headlight beam level control system does not operate (Left Headlight)	Headlight beam level control actuator circuit	Refer to Headlight Beam Level Control Actuator Circuit [03/2019 - ]
	Headlight ECU sub-assembly LH	Refer to REMOVAL [03/2019 - ]
Automatic headlight beam level control system does not operate (Right Headlight)	Headlight beam level control actuator circuit	Refer to Headlight Beam Level Control Actuator Circuit [03/2019 - ]
	Headlight ECU sub-assembly RH	Refer to REMOVAL [03/2019 - ]
Initialization cannot be performed	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [03/2019 - 01/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [01/2023 - ]
Initialization cannot be performed	Headlight ECU sub-assembly LH	Refer to REMOVAL [03/2019 - ]