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.
When an open circuit indication is displayed by the self-check function, check for DTCs and troubleshoot according to each inspection procedure.

General
Symptom	Suspected Area	See page
System does not operate at all	Proceed to "Clearance Warning ECU Power Source Circuit"	Click here
System does not operate at all	Proceed to "Clearance Sonar Main Switch Circuit"	Click here
System cannot be turned off	Proceed to "Clearance Sonar Main Switch Circuit"	Click here

Sonar Function
Symptom	Suspected Area	See page
Combination meter assembly (shift indicator) operates normally, but detection operates when park (P) has been selected, or detection does not operate when a shift state other than park (P) has been selected (front sensor)	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Combination meter assembly (shift indicator) operates normally, but detection operates when a shift state other than reverse (R) has been selected, or does not operate with reverse (R) selected (rear sensor)	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Combination meter assembly (speedometer) operates normally, but detection does not operate when vehicle speed meets operation condition, or detection operates when vehicle speed does not meet operation condition (front sonar)	CAN communication system	Click here
	Clearance warning ECU assembly	Click here

Buzzer Function
Symptom	Suspected Area	See page
Sonar detection operation is normal but buzzer operation is intermittent	Check that the temporary mute function is not in operation	-
	Proceed to "Clearance Warning Buzzer Circuit"	Click here
	Clearance warning ECU assembly	Click here

Display Function
Symptom	Suspected Area	See page
Detection operation is normal but clearance sonar indicator does not illuminate	CAN communication system	Click here
	Combination meter assembly (LED): Perform Active Test (Indicat. Clearance Sonar LCD)	Click here
	Combination meter assembly	Click here
	Clearance warning ECU assembly	Click here
Detection operation is normal but all sonar displays do not appear on multi-information display and multi-display	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Detection operation is normal but sonar displays do not appear on multi-information display	CAN communication system	Click here
	Combination meter assembly	Click here
	Clearance warning ECU assembly	Click here
Detection operation is normal but sonar displays do not appear on multi-display assembly*1	CAN communication system	Click here
	Multi-display	Click here
	Multi-media module receiver assembly	Click here
	Clearance warning ECU assembly	Click here