LEXUS PARKING ASSIST-SENSOR 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.

General
Symptom	Suspected Area	See page
System does not operate at all (self-check function does not operate)	Clearance warning ECU power source circuit	Click here
	Clearance sonar main switch circuit	Click here
	CAN communication system (for LHD)	Click here
	CAN communication system (for RHD)	Click here
	Clearance warning ECU	Click here
	Outer mirror switch	Click here
ECU does not operate, when clearance sonar main switch is turned to ON or OFF	Read value using intelligent tester (EEPROM)	Click here
	Clearance warning ECU	Click here

Sonar function
Symptom	Suspected Area	See page
Freeze condition is displayed as a result of self-check	Remove ice, mud or snow from the ultrasonic sensor	-
Open circuit in front sensors is displayed as a result of self-check	Front left side sensor malfunction	Click here
	Front left sensor malfunction	Click here
	Front left center sensor malfunction	Click here
	Front right center sensor malfunction	Click here
	Front right sensor malfunction	Click here
	Front right side sensor malfunction	Click here
	Clearance warning ECU	Click here
Open circuit in rear sensors is displayed as a result of self-check	Rear right sensor malfunction	Click here
	Rear right center sensor malfunction	Click here
	Rear left center sensor malfunction	Click here
	Rear left sensor malfunction	Click here
	Clearance warning ECU	Click here
Detection operation operates even when vehicle speed is over 13 km/h (8 mph)	CAN communication system (for LHD)	Click here
	CAN communication system (for RHD)	Click here
	Clearance warning ECU	Click here

Display function
Symptom	Suspected Area	See page
Detection operation is normal but sonar displays do not appear on multi-information display	CAN communication system (for LHD)	Click here
	CAN communication system (for RHD)	Click here
	Clearance warning ECU	Click here
	No. 1 meter ECU	Click here
Detection operation is normal but sonar displays do not appear on multi-display	CAN communication system (for LHD)	Click here
	CAN communication system (for RHD)	Click here
	Clearance warning ECU	Click here
	Multi-media module receiver	Click here
	Accessory meter	Click here
Detection operation is normal but clearance sonar main switch indicator does not illuminate	CAN communication system (for LHD)	Click here
	CAN communication system (for RHD)	Click here
	Clearance warning ECU	Click here
	Outer mirror switch	Click here

Buzzer function
Symptom	Suspected Area	See page
Detection operation is normal but buzzer operation is intermittent	Front clearance warning buzzer circuit	Click here
	Rear clearance warning buzzer circuit	Click here
	Clearance warning ECU	Click here