Toyota Tacoma 2018 Owner's Manual page 309

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When the rear differential is locked (vehicles with the rear differential
lock system)
The active traction control system is activated only when the vehicle speed is
less than 3 mph (6 km/h).
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Sounds and vibrations caused by the active traction control system
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A sound may be heard from the engine compartment when the engine is
started or just after the vehicle begins to move. This sound does not indicate
that a malfunction has occurred in the system.
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Vibrations may be felt through the vehicle body and steering. It may occur
when the system is operating.
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If the brake system overheats
The system will cease operation, a buzzer will sound to alert the driver. Stop
the vehicle in a safe place. (There is no problem with continuing normal driv-
ing.)
The system will be automatically restored after a short time.
WARNING
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The active traction control system may not operate effectively when
Directional control and power may not be achievable while driving on slip-
pery road surfaces, even if the active traction control system is operating.
Do not drive the vehicle in conditions where stability and power may be lost.
4-5. Using the driving support systems
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