Toyota Yaris: Pre-collision System / Diagnosis System

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / 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.

Warning Message	Detail	DTC/RoB	PCS warning light
"Pre-Collision System Malfunction Visit Your Dealer"	Pre-collision system malfunctioning	Stored	Illuminates
"Pre-Collision System Radar In Self Calibration Unavailable See Owner's Manual"	Millimeter wave radar sensor assembly misaligned	Stored	Illuminates
"Pre-Collision System Out of Temperature Range Unavailable See Owner's Manual"	Millimeter wave radar sensor assembly temperature malfunction	Stored	Illuminates
"Pre-Collision System Unavailable See Owner's Manual"	Millimeter wave radar sensor assembly voltage malfunction Determination was made for temporary suspension of system operation due to millimeter wave radar sensor assembly detecting interference from other nearby radar emitters	Stored	Illuminates
"Pre-Collision System Radar Sensor Blocked Unavailable Clean Radar Sensor"	Foreign matter attached to millimeter wave radar sensor assembly	Stored	Illuminates
"Front Camera Unavailable See Owner's Manual"	Abnormal forward recognition camera voltage	Stored	Illuminates
"Front Camera Out of Temperature Range Unavailable Wait until Normal Temperature"	Forward recognition camera temperature outside of operational range	Stored	Illuminates
"Front Camera Low Visibility Unavailable See Owner's Manual"	Foreign matter attached to forward recognition camera or area of windshield in front of forward recognition camera Forward recognition camera or area of windshield in front of forward recognition camera is fogged up	Stored	Illuminates
"VSC Turned Off Pre-Collision Brake System Unavailable"	VSC system is disabled	Not stored	Illuminates

PCS Warning Light Illumination Status

PCS Warning Light	Condition
Illuminates	Pre-collision system malfunctioning
	Pre-collision system temporarily disabled
	During pre-collision system radar alignment
	Pre-collision system disabled
	VSC system disabled
Not illuminated	Other

INITIAL CHECK

(a) An initial check is performed when the ignition switch is off for more than 2 seconds and then turned ON. The initial check consists of a pre-collision system diagnostic check with a duration of approximately 3 seconds.

(b) If a malfunction is discovered during initial check, then after the initial check (after 3 seconds have elapsed), the PCS warning light in the combination meter assembly will illuminate and a message indicating a pre-collision system malfunction or that the pre-collision system is temporarily unusable will be displayed in the multi-information display.

CONSTANT CHECK

(a) The millimeter wave radar sensor assembly constantly monitors the pre-collision system for malfunctions after the ignition switch is turned ON and the initial check (approximately 3 seconds) has completed.

(b) If a malfunction is detected during the constant check, the PCS warning light in the combination meter assembly will illuminate and a warning message indicating the pre-collision system is malfunctioning or disabled will be displayed on the multi-information display.

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...

Terminals Of Ecu

TERMINALS OF ECU NOTICE: Turning the ignition switch to ON with connectors disconnected may cause DTCs to be stored. Make sure to clear the DTCs after inspection has been performed...

Other information:

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Removal

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Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Data List / Active Test

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