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 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.	Clearance warning ECU assembly power source circuit	Click here
	Clearance sonar main switch circuit	Click here
	Clearance warning ECU assembly	Click here
System can not be turned off.	Clearance sonar main switch circuit	Click here
System can not be turned off.	Clearance warning ECU assembly	Click here

Sonar Function
Symptom	Suspected Area	See page
Frozen indication is displayed in self-check function.	Precaution	Click here
	Replace ultrasonic sensor in part where frozen indication is displayed	-
	Clearance warning ECU assembly	Click here
Combination meter assembly (shift 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 ultrasonic sensor).	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Combination meter assembly (shift indicator) operates normally, but detection operates when shift lever is in any position other than R, or detection does not operate when shift lever is in R (rear ultrasonic sensor).	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Detection operation operates even when vehicle speed exceeds the operation condition speed.	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.	Clearance warning buzzer circuit	Click here
	Clearance warning ECU assembly	Click here

Display Function
Symptom	Suspected Area	See page
Detection operation is normal but all sonar displays do not appear.	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Detection operation is normal but sonar displays of multi-information display do not appear.	CAN communication system	Click here
	Combination meter assembly	Click here
	Clearance warning ECU assembly	Click here