PRE-COLLISION 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.
The pre-collision system uses the CAN communication system. First, confirm that there are no malfunction in the CAN communication system. Refer to How to Proceed with Troubleshooting.

Pre-Collision System
Symptom	Suspected Area	Link
"Pre-Collision System Unavailable" is displayed	Perform millimeter wave radar sensor assembly adjustment	Click here
	Millimeter wave radar sensor assembly temperature malfunction	Click here
	Millimeter wave radar sensor assembly low voltage malfunction	Click here
	Millimeter wave radar sensor assembly	Click here
	Combination meter assembly	Click here
	Driving support ECU assembly	Click here
"Pre-Collision System Unavailable Clean Sensor" is displayed	Foreign matter attached to millimeter wave radar sensor assembly	-
	Millimeter wave radar sensor assembly	Click here
	Combination meter assembly	Click here
	Driving support ECU assembly	Click here
"Front Camera Unavailable" is displayed	Check current condition of forward recognition camera based on related Data List items. Abnormal forward recognition camera voltage Forward recognition camera temperature outside of operational range Other forward recognition camera malfunction	Click here
	Forward recognition camera	Click here
	Combination meter assembly	Click here
	Driving support ECU assembly	Click here
"Front Camera Vision Blocked Clean and Demist Windshield" is displayed	Foreign matter attached to forward recognition camera or area of windshield in front of forward recognition camera	-
	Forward recognition camera	Click here
	Combination meter assembly	Click here
	Driving support ECU assembly	Click here
Although there is possibility of collision, pre-collision controls (all controls) do not operate ("Pre-collision System Unavailable" is not displayed)	Check if pre-collision system is canceled	-
	Vehicle condition/environment does not match the pre-collision system 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
	Check installation condition of forward recognition camera	Click here
	Perform forward recognition camera adjustment	Click here
	Forward recognition camera	Click here
	Driving support ECU assembly	Click here
Although there is no possibility of collision, pre-collision controls (all controls) operate	Vehicle condition/environment does not match the pre-collision system 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
	Check installation condition of forward recognition camera	Click here
	Perform forward recognition camera adjustment	Click here
	Forward recognition camera	Click here
	Driving support ECU assembly	Click here
Pre-collision system does not operate	Check if pre-collision system is canceled	-
	ECU power source circuit	Click here
	Driving support ECU assembly	Click here
Pre-collision system cannot be canceled (PCS warning light does not illuminate)	Combination meter assembly (check if indicator illuminates using Active Test)	Click here
	Driving support ECU assembly	Click here
	Combination meter assembly	Click here