Toyota Land Cruiser Prado Owner's Manual page 141

3-1. Using off-road driving systems
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System malfunction
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The DAC indicator does not come on when the "ENGINE START STOP"
switch is turned to IGNITION ON mode.
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The "DAC" indicator does not come on when the "DAC" switch is
pressed.
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The slip indicator comes on.
In the above cases, have your vehicle checked by your Toyota dealer.
CAUTION
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When using downhill assist control
Do not rely overmuch on the downhill assist control. This function does not
extend the vehicle's performance limitations. Always thoroughly check the
road conditions, and drive safely.
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The system may not operate on the following surfaces, which may lead
to an accident causing death or serious injury
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Slippery surfaces such as wet or muddy roads
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Icy surface
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Unpaved roads
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