Toyota Land Cruiser Prado Owner's Manual page 140

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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 1 range of S mode.
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If the four-wheel drive control switch is in H4
The system does not operate.
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When the downhill assist control system is operated continuously
This may cause the brake actuator to overheat. In this case, the downhill
assist control system will stop operating, a buzzer will sound and the DAC
indicator will start flashing, and the "TRC OFF" indicator light will come on
(non-optitron type meters) or the TRC OFF will be shown on the multi-infor-
mation display (optitron type meters). Refrain from using the system until the
DAC indicator stays on and "TRC OFF" indicator light turns off (non-optitron
type meters) or the message goes off (optitron type meters). (The vehicle
can be driven normally during this time.)
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Sounds and vibrations caused by the DAC
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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 indi-
cate that a malfunction has occurred in DAC.
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Either of the following conditions may occur when the DAC is operating.
None of these are indicators that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
3-1. Using off-road driving systems
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