Toyota Yaris: Pre-collision System / Problem Symptoms Table

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

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 malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

Pre-Collision System

Symptom	Suspected Area	Link
"Pre-Collision System Radar In Self Calibration Unavailable See Owner's Manual" is displayed	Vehicle control history: X2024: Front Radar Sensor Temporary Unavailable (Vertical Direction Optical Axis Misalignment)	Check the vehicle control history of the front radar sensor system. Perform millimeter wave radar sensor assembly beam axis alignment. HINT: Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment. Triangle Target: Flat Surface Target: Driving Adjustment: Turn the ignition switch off. Turn the ignition switch to ON. Check that "Pre-Collision System Radar In Self Calibration Unavailable See Owner's Manual" is not displayed on the multi-information display. A determination was made that millimeter wave radar sensor assembly vertical axis was misaligned.
"Pre-Collision System Radar Sensor Blocked Unavailable Clean Radar Sensor" is displayed	Vehicle control history: X2026: Front Radar Sensor Dirt	Check the vehicle control history of the front radar sensor system. Check whether the millimeter wave radar sensor assembly and surrounding area is dirty or obstructed by foreign matter A non-genuine millimeter wave sensor cover is installed There is dirt on the radar, the radar sensor cover or the surrounding area An accessory, such as bull bars, a grille guard, etc., which interferes with millimeter radio waves is installed The sensor cover or its surrounding area has been painted or has a sticker attached There is foreign matter between the radar and radar sensor cover Clean away any dirt or foreign matter that is adhering to the area around the millimeter wave radar sensor assembly. Turn the ignition switch off. Start the engine and drive the vehicle for 5 minutes or more. Check whether "Pre-Collision System Radar Sensor Blocked Unavailable Clean Radar Sensor" is displayed on the multi-information display. If the message is still displayed, perform beam axis alignment of the millimeter wave radar sensor assembly. HINT: Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment. Triangle Target: Flat Surface Target: Driving Adjustment: The millimeter wave radar sensor assembly is dirty or obstructed by foreign matter.
"Pre-Collision System Out of Temperature Range Unavailable See Owner's Manual" is displayed	Vehicle control history: X2027: Front Radar Sensor Outside Guaranteed Operating Temperature	Check the vehicle control history of the front radar sensor system. Using the GTS, check "Millimeter-wave Circuit Temperature Protection" in the Data List for Front Radar Sensor. If the value of "Millimeter-wave Circuit Temperature Protection" is ON, warm or cool the area around the millimeter wave radar sensor assembly. The following millimeter wave radar sensor assembly conditions are met: After being subjected to an extremely cold environment, the area around the millimeter wave radar sensor assembly is -30°C (-22°F) or less. After being subjected to an extremely hot environment, the area around the millimeter wave radar sensor assembly is 70°C (158°F) or more.
"Pre-Collision System Unavailable See Owner's Manual" is displayed	Vehicle control history: X2028: Front Radar Sensor Outside Guaranteed Operating Voltage	Check the vehicle control history of the front radar sensor system. Using the GTS, check "IG Voltage Protection" in the Data List for Front Radar Sensor. If the value of "IG Voltage Protection" is ON, check if the voltage between terminals IGB and SGND of the millimeter wave radar sensor assembly is within the specified range. As power for the millimeter wave radar sensor assembly is supplied by the start and stop system, confirm that the start and stop system is not malfunctioning. The following millimeter wave radar sensor assembly conditions are met: The input voltage decreases to approximately 8 V or less directly after the engine is starts The input voltage increases to approximately 16 V or more directly after the engine is starts.
"Pre-Collision System Unavailable See Owner's Manual" is displayed	Vehicle control history: X202B: Front Radar Sensor Temporary Unavailable (Radio Wave Interference)	Check the vehicle control history of the front radar sensor system. Move the vehicle to a different location until "Pre-Collision System Unavailable See Owner's Manual" disappears from the multi-information display. Determination was made for temporary suspension of system operation due to millimeter wave radar sensor assembly detecting interference from other nearby radar emitters. HINT: If the system does not return to normal even after moving the vehicle to a different location, there may be a problem with the steering center position. Inspect the steering system components for incorrect installation, deformation, or damage, and perform calibration or replace components as necessary.
"VSC Turned Off Pre-Collision Brake System Unavailable" is displayed	Check whether VSC is off	-
	Vehicle stability control system
Pre-collision system cannot be canceled (PCS warning light does not illuminate)	Combination meter assembly (check if indicator illuminates using Active Test)
	Meter / gauge system
	Steering pad switch assembly
	Combination meter assembly

Utility

UTILITY NOTICE: If any of the following parts have been replaced, perform beam/optical axis learning. Otherwise all systems that use the parts may be affected...

Diagnosis System

DIAGNOSIS SYSTEM FUNCTION OF WARNING INDICATOR AND MESSAGE (a) If the pre-collision system is not functioning properly, the driver is warned by the PCS warning light and a warning message is displayed on the multi-information display...

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