Toyota TUNDRA Manual page 243

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If the PCS warning light flashes or illuminates, and a warning message is
displayed on the multi-information display
The pre-collision system may be temporarily unavailable or there may be a
malfunction in the system.
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In the following situations, the warning light will turn off, the message will
disappear and the system will become operational when normal operating
conditions return:
• When the radar sensor or camera sensor or the area around either sen-
sor is hot, such as in the sun
• When the radar sensor or camera sensor or the area around either sen-
sor is cold, such as in an extremely cold environment
• When the radar sensor or front grille emblem is dirty or covered with
snow, etc.
• When the part of the windshield in front of the camera sensor is fogged
up or covered with condensation or ice
(Defogging the windshield: →P. 414, 421)
• If the camera sensor is obstructed, such as when the hood is open or a
sticker is attached to the windshield near the camera sensor
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If the PCS warning light continues to flash or illuminate, or the warning mes-
sage does not disappear, the system may be malfunctioning. Have the vehi-
cle inspected by your Toyota dealer immediately.
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If VSC is disabled
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If VSC is disabled (→P. 304), the pre-collision brake assist and pre-collision
braking functions are also disabled.
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The PCS warning light will turn on and "VSC Turned Off Pre-Collision Brake
System Unavailable" will be displayed on the multi-information display.
4-5. Using the driving support systems
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