PRE-CRASH SAFETY 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.

Pre-crash Safety System
Symptom	Suspected Area	See page
"CHECK PCS SYSTEM" is displayed	Seat belt control ECU	Click here
"PCS TEMPORARILY NOT AVAILABLE" is displayed	System determines obstacles cannot be detected due to millimeter wave radar sensor assembly or radiator grille being dirty. If dirt is removed, normal control returns (dirt history can be checked using Data List).	Click here
	System determines millimeter wave radar sensor assembly cannot detect obstacles due to bad weather. If weather recovers, normal control returns (bad weather history can be checked using Data List).	Click here
	Overheating prevention function of seat belt control ECU or millimeter wave radar sensor assembly operates. If ECU temperature drops, normal control returns.	-
	Pre-crash brake cancel switch circuit	Click here
	Millimeter wave radar sensor assembly	Click here
	Seat belt control ECU	Click here
	Driving support ECU	Click here
Although there is possibility of collision, pre-crash control (all front collision controls) does not operate ("PCS TEMPORARILY NOT AVAILABLE" is not displayed)	Vehicle condition/environment does not match pre-crash control operation conditions (confirm control operation conditions)	Click here
	Check installation condition of millimeter wave radar sensor assembly	Click here
	Perform millimeter wave radar sensor assembly adjustment	Click here
	Millimeter wave radar sensor assembly	Click here
	Driving support ECU	Click here
Although there is no possibility of collision, pre-crash control (all front collision controls) operates	Vehicle condition/environment match pre-crash control operation conditions (confirm control operation conditions)	Click here
	Check millimeter wave radar sensor assembly	Click here
	Perform millimeter wave radar sensor assembly adjustment	Click here
	Millimeter wave radar sensor assembly	Click here
	Driving support ECU	Click here
Only pre-crash seat belt does not operate	Buckle switch error (malfunction in which DTC is not output)	-
Only pre-crash seat belt does not operate	Seat belt control ECU	Click here
Pre-crash brake cannot be canceled (pre-crash safety warning indicator does not illuminate)	Combination meter assembly (check if indicator blinks using Active Test)	Click here
	Pre-crash brake cancel switch circuit	Click here
	Driving support ECU	Click here