LANE-KEEPING ASSIST SYSTEM PROBLEM SYMPTOMS TABLE

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.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Lane-keeping Assist System
Symptom	Suspected Area	See page
Lane-keeping assist system does not operate	Main switch circuit	Click here
	Electronically controlled brake system	Click here
	Power steering system	Click here
	Lane recognition camera sensor assembly	Click here
	Harness or connector	-
	Driving support ECU	Click here
LKA indicator light abnormal (Does not turn on)	Indicator light circuit	Click here
	Main switch circuit	Click here
	Combination meter assembly	Click here
	Driving support ECU	Click here
LKA indicator light abnormal (Remains on)	Indicator light circuit	Click here
	Main switch circuit	Click here
	Combination meter assembly	Click here
	Driving support ECU	Click here
Lane-keeping assist system is not canceled even when turn signal light switch is operated.	Headlight dimmer switch circuit	Click here
	Headlight dimmer switch assembly	Click here
	Harness or connector	-
	Driving support ECU	Click here
Lane-keeping assist system is not canceled even when windshield wiper switch is operated (Hi)	Wiper signal circuit	Click here
	Windshield wiper switch assembly	Click here
	Harness or connector	-
	Driving support ECU	Click here
Increase in cases that driver can see line marker but system cannot detect lane markers	Windshield glass is dirty	-
	Lane recognition camera is dirty	-
	Adjust lane recognition camera sensor assembly	Click here
	Driving support ECU	Click here
Lane-keeping assist system is operating, but no operation condition is displayed on multi-information display in combination meter	Combination meter assembly	Click here
	Driving support ECU	Click here
Buzzer does not sound even when lane markers are lost during lane departure warning function	Skid control buzzer assembly	Click here
	Skid control ECU assembly	Click here
	Driving support ECU	Click here