TOYOTA PARKING ASSIST-SENSOR SYSTEM(for Sedan with Simple Intelligent Parking Assist System) PROBLEM SYMPTOMS TABLE

Tip:

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.

Table 1. General
Symptom	Suspected Area	Link
System does not operate at all	Proceed to "Clearance Warning ECU Power Source Circuit"	Click here
	Proceed to "Clearance Sonar Main Switch Circuit"	Click here
	Clearance warning ECU assembly	Click here
System cannot be turned off	Proceed to "Clearance Sonar Main Switch Circuit"	Click here
System cannot be turned off	Clearance warning ECU assembly	Click here

Table 2. Sonar Function
Symptom	Suspected Area	Link
Combination meter assembly (brake warning) operates normally, but detection does not operate when parking brake is released, or detection operates when parking brake is applied (front sonar)*1	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Detection operates when shift lever is in any position other than R, or does not operate with shift lever in R (rear sonar)*1	Proceed to "Reverse Signal Circuit" (Simple Intelligent Parking Assist System)	Click here
	Clearance warning ECU assembly	Click here
Combination meter assembly (shift selection) 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)*2	CAN communication system	Click here
	Clearance warning ECU assembly	Click here
Combination meter assembly (shift selection) 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)*2	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 satisfies operation condition, or detection operates when vehicle speed does not satisfy operation condition (front sonar)	CAN communication system	Click here
	Clearance warning ECU assembly	Click here

Table 3. Buzzer Function
Symptom	Suspected Area	Link
Sonar detection operation is normal but buzzer operation is intermittent	Proceed to "Clearance Warning Buzzer Circuit"	Click here
	Clearance warning ECU assembly	Click here

Table 4. Display Function
Symptom	Suspected Area	Link
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