TOYOTA 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
	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
System cannot be turned off	CAN communication system	Click here
System cannot be turned off	Clearance warning ECU assembly	Click here

Sonar Function
Symptom	Suspected Area	Link
Sensor frozen indication (dirty or frozen)	Proceed to "Sensor Frozen Indication (Dirty or Frozen)"	Click here
Meter circuit plate (shift position 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 sonar).	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Meter circuit plate (shift position 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 sonar)	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Meter circuit plate (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	Link
Sonar detection operation is normal but buzzer operation is intermittent	Check that the temporary mute function is not operating	-
	Proceed to "Clearance Warning Buzzer Circuit"	Click here
	Clearance warning ECU assembly	Click here

Display Function
Symptom	Suspected Area	Link
Detection operation is normal but clearance sonar indicator does not illuminate	CAN communication system	Click here
	Meter circuit plate (LED): Perform Active Test (Indicat. Clearance Sonar LCD)	Click here
	Meter circuit plate	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
	Meter circuit plate	Click here
	Clearance warning ECU assembly	Click here
When reverse (R) is selected, detection operation is normal but sonar display does not appear on multi-display*	CAN communication system	Click here
	Navigation receiver assembly*2	Click here
	Radio and display receiver assembly*3	Click here
	Rear Television Camera Assembly	Click here
	Clearance warning ECU assembly	Click here