TOYOTA 2012 Tacoma - Manual (Page 173)

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2-4. Using other driving systems
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Operating tips
The system will operate when the shift lever is in a position other than P.
However, to make effective use of the system it is recommended that the
shift lever be shifted to 2 or L.
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The system will not operate when
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The front-wheel drive control switch is in the H2 or H4 position.
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The rear differential is locked.
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The downhill assist control system indicator light flashes when
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The shift lever is in the N position.
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The front-wheel drive control switch is in the H2 or H4 position.
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The rear differential is locked.
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If the brake system overheats
The system will cease operation and a buzzer will sound to alert the driver.
Stop the vehicle in a safe place. (There is no problem with continuing normal
driving.)
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System malfunction
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The downhill assist control system indicator does not come on when the
engine switch is turned to the ON position.
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The downhill assist control system indicator does not come on when the
DAC switch is pressed.
In the above cases have your vehicle checked by your Toyota dealer.
CAUTION
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Do not rely excessively on the downhill assist control system
It may not be able to maintain a low speed over road surfaces on which slid-
ing can easily occur, such as extremely steep slopes or icy or muddy roads.