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 inspection the suspected area below.

TOYOTA Parking Assist-Sensor System
Symptom	Suspected Area	See page
Entirely inoperative (Initial check does not function)	Clearance Sonar Main Switch Circuit	Click here
Entirely inoperative (Initial check does not function)	Rear Clearance Warning ECU Assembly	Click here
No. 1 ultrasonic sonar does not function (Initial check functions normally)	Back Sonar Sensor Circuit	Click here
	Rear Clearance Warning ECU Assembly	Click here
Although detection is possible, sometimes buzzer does not sound	Clearance Warning Buzzer Circuit	Click here
	Rear Clearance Warning ECU Assembly	Click here
Malfunction is indicated during the initial check	Back Sonar Sensor Circuit	Click here
Malfunction is indicated during the initial check	Rear Clearance Warning ECU Assembly	Click here
The system operates with the shift lever in any position except R, or does not operate with the shift lever in R	Park / Neutral Position Switch Circuit*1	Click here
	Back-up Light Circuit*2	Click here
	Rear Clearance Warning ECU Assembly	Click here
Detection is possible although the vehicle speed is approximately 10 km/h (6 mph) or more	Speed Signal Circuit	Click here
	Rear Clearance Warning ECU Assembly	Click here
Buzzer volume is too low	Adjust Buzzer Volume	Click here