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 System
Symptom	Suspected Area	See page
System does not operate normally even when DTCs are not output	Power source circuit	Click here
	Seat belt warning system	Click here
	Pre-crash Safety Brake Cancel Switch Circuit	Click here
	Front seat inner belt assembly RH	Click here
	Front seat inner belt assembly LH	Click here
	Seat belt control ECU	Click here
Only pre-crash brake operation is not performed	Pre-crash Safety Brake Cancel Switch Circuit	Click here
	Driving support ECU assembly	Click here
	Skid control ECU (for LHD)	Click here
	Skid control ECU (for RHD)	Click here
Although there is no possibility of crash, pre-crash controls (all front crash controls) operate	Proceed to "Cases of Unnecessary Pre-crash System Operation" (Although there is no possibility of crash, the millimeter wave radar sensor detects an object and activates the pre-crash system)	Click here
	Check installation condition of millimeter wave radar sensor	Click here
	Perform millimeter wave radar sensor adjustment	Click here
	Millimeter wave radar sensor	Click here
	Seat belt control ECU	Click here
	Driving support ECU assembly	Click here
Although there is possibility of crash, pre-crash controls (all front crash controls) do not operate	Pre-crash Safety Brake Cancel Switch Circuit	Click here
	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	Click here
	Perform millimeter wave radar sensor adjustment	Click here
	Millimeter wave radar sensor	Click here
	Seat belt control ECU	Click here
	Driving support ECU assembly	Click here
Pre-crash system OFF (pre-crash brake) does not operate	LED (perform Active test)	Click here
	Pre-crash Safety Brake Cancel Switch Circuit	Click here
	Meter circuit plate	Click here
	Skid control ECU (for LHD)	Click here
	Skid control ECU (for RHD)	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