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 or frozen indication is displayed by the self-check function, check for DTCs and troubleshoot according to each inspection procedure.

General
Symptom	Suspected Area	Link
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	Link
Combination meter assembly (shift position indicator) operates normally, but detection operates when shift lever is in P, or detection does not operate when shift lever is in any position other than P (front sonar)	CAN communication system	Click here
	Clearance warning ECU assembly*1	Click here
	Clearance warning ECU assembly*2	Click here
Combination meter assembly (shift position indicator) operates normally, but detection operates when shift lever is in any position other than R, or does not operate with shift lever in R (rear sonar)	CAN communication system	Click here
	Clearance warning ECU assembly*1	Click here
	Clearance warning ECU assembly*2	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*1	Click here
	Clearance warning ECU assembly*2	Click here

Buzzer Function
Symptom	Suspected Area	Link
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*1	Click here
	Clearance warning ECU assembly*2	Click here

Display Function
Symptom	Suspected Area	Link
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*1	Click here
	Clearance warning ECU assembly*2	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*1	Click here
	Clearance warning ECU assembly*2	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*1	Click here
	Clearance warning ECU assembly*2	Click here
Detection operation is normal but sonar displays do not appear on multi-display assembly	CAN communication system	Click here
	Multi-display assembly	Click here
	Radio receiver assembly*3	Click here
	Radio receiver assembly*4	Click here
	Clearance warning ECU assembly*1	Click here
	Clearance warning ECU assembly*2	Click here