LEXUS PARKING ASSIST-SENSOR 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 open circuit indication is displayed during 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 (self-check function does not operate)	Proceed to "Clearance Warning ECU Power Source Circuit"*1	Click here
	Proceed to "ECU Power Source Circuit"*2	Click here
	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	Click here
System cannot be turned off	Replace clearance warning ECU*1	Click here
System cannot be turned off	Replace parking assist ECU*2	Click here

Table 2. Sonar Function
Symptom	Suspected Area	Link
Frozen indication is displayed in self-check function	Refer to Precaution	Click here
	Replace ultrasonic sensor in part where frozen indication is displayed	-
	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	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 except P (front ultrasonic sensor)	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	Click here
Combination meter assembly (shift indicator) operates normally, but detection operates when shift lever is in any position except R, or does not operate with the shift lever in R (rear ultrasonic sensor)	Proceed to "Reverse Signal Circuit"	Click here
	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	Click here
Detection operation operates even when vehicle speed exceeds operation condition speed	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	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
	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	Click here

Table 4. Display Function
Symptom	Suspected Area	Link
Detection operation is normal but clearance sonar indicator does not illuminate	Combination meter assembly (Active Test)	Click here
	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	Click here
Detection operation is normal but no sonar displays appear	Replace clearance warning ECU*1	Click here
Detection operation is normal but no sonar displays appear	Replace parking assist ECU*2	Click here
Detection operation is normal but sonar displays of multi-information display do not appear	Replace combination meter assembly	Click here
	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	Click here
Detection operation is normal but sonar displays of multi-display do not appear	Replace accessory meter assembly*3	Click here
	Replace display and navigation module display*4	Click here
	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	Click here

Table 5. Switch Function
Symptom	Suspected Area	Link
Clearance sonar main switch does not operate	Proceed to "B2660"	Click here
	Proceed to "Main Switch Circuit"	Click here
	Replace clearance warning ECU*1	Click here
	Replace parking assist ECU*2	Click here