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