Problem Symptoms Table [10/2018 - 07/2022]

NOTE:

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

HINT:

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.
Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022]

PRE-COLLISION SYSTEM

Symptom	Suspected Area	Link
"Pre-Collision System Unavailable" is displayed	Vehicle control history: X2024: Front Radar Sensor Temporary Unavailable (Vertical Direction Optical Axis Misalignment) X2025: Front Radar Sensor Temporary Unavailable (Horizontal Direction Optical Axis Misalignment)	Check the vehicle control history of the pre-collision system Refer to VEHICLE CONTROL HISTORY [10/2018 - 07/2022] If the vehicle control history of the pre-collision system is stored, check the installation condition of the millimeter wave radar sensor assembly Refer to INSTALLATION [10/2018 - 07/2022] Adjust the millimeter wave radar sensor assembly beam axis Refer to ADJUSTMENT [10/2018 - 07/2022] Cause: X2024: Stores the history when the millimeter wave radar sensor assembly judges that the millimeter wave radar sensor assembly vertical axis is misaligned X2025: Stores the history when the millimeter wave radar sensor assembly judges that the millimeter wave radar sensor assembly horizontal axis is misaligned
"Pre-Collision System Unavailable" is displayed	Vehicle control history: X2027: Front Radar Sensor Outside Guaranteed Operating Temperature	Check the vehicle control history of the front radar sensor system Refer to DATA LIST / ACTIVE TEST [10/2018 - 07/2022] Using the Techstream, check the "Millimeter-wave Circuit Temperature Protection" for the front radar sensor on the Data List Refer to DATA LIST / ACTIVE TEST [10/2018 - 07/2022] If the "Millimeter-wave Circuit Temperature Protection" is ON, cool or warm the area surrounding the millimeter wave radar sensor assembly Cause: The millimeter wave radar sensor assembly is in one of the following conditions When the ambient temperature of the millimeter wave radar sensor is -30°C (-22°F) or less, such as when the vehicle is left alone in an extremely cold environment When the ambient temperature of the millimeter wave radar sensor is 70°C (158°F) or higher, such as when the vehicle is left alone in an extremely hot environment
"Pre-Collision System Unavailable" is displayed	Vehicle control history: X2028: Front Radar Sensor Outside Guaranteed Operating Voltage	Check the vehicle control history of the front radar sensor system Refer to VEHICLE CONTROL HISTORY [10/2018 - 07/2022] After clearing the vehicle control history, drive at a vehicle speed of 5 km/h (3 mph) or more and check whether the vehicle control history is output If the vehicle control history is output, check if the voltage of the millimeter wave radar sensor assembly ECU terminal layout (IGB to SGND) is within the specified range Refer to TERMINALS OF ECU [10/2018 - ] Cause: The millimeter wave radar sensor assembly is in one of the following conditions When the input voltage is approximately 8 V or less, immediately after starting the hybrid control system When the input voltage is approximately 16 V or higher, immediately after starting the hybrid control system
"Pre-Collision System Unavailable Clean Sensor" is displayed	Vehicle control history: X2026: Front Radar Sensor Dirt	Check the vehicle control history of the front radar sensor system Refer to VEHICLE CONTROL HISTORY [10/2018 - 07/2022] Check for the following Whether a cover other than the dedicated millimeter wave radar cover is being used Whether the area surrounding the radar and emblem is dirty Whether accessories that may interfere with the radar waves such as a bull bar is installed Whether any paint, coating or stickers are applied to the dedicated cover Whether any foreign matter is stuck between the radar and emblem Cause: When foreign matter or dirt is attached to the millimeter wave radar sensor assembly
"VSC Turned OFF Pre-Collision Brake System Unavailable" is displayed	Check whether VSC is off	-
	Electronically controlled brake system*1	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022]
	Electronically controlled brake system*2	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ]
Pre-collision system cannot be canceled (PCS warning light does not illuminate)	Pre-collision system cannot be canceled (PCS warning light does not illuminate)	Refer to DATA LIST / ACTIVE TEST [10/2018 - 07/2022]
	Meter / gauge system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022]
	Steering pad switch assembly	Refer to INSPECTION [10/2018 - ]
	Combination meter assembly	Refer to REMOVAL [10/2018 - 07/2022]

*1: for Gasoline Model
*2: for HV Model