When The Downhill Assist Control System Is Operated Continuously; Sounds And Vibrations Caused By The Downhill Assist Control System; Downhill Assist Control System Malfunction; When Using Downhill Assist Control System - Caution - Lexus GX 460 User Manual

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4-5. Using the driving support systems
Operating tips
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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.
If the four-wheel drive control switch is in H4
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The system does not operate.

When the downhill assist control system is operated continuously

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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 downhill assist control system
indicator will start flashing, and the "TRAC OFF" will be shown on the multi-information
display. Refrain from using the system until the downhill assist control system indicator
stays on and the message goes off. (The vehicle can be driven normally during this time.)

Sounds and vibrations caused by the downhill assist control system

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A sound may be heard from the engine compartment when the engine is started or just
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after the vehicle begins to move. This sound does not indicate that a malfunction has
occurred in downhill assist control system.
Either of the following conditions may occur when the downhill assist control system is
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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.
System malfunction
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The downhill assist control system indicator does not come on when the engine switch
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is turned to IGNITION ON mode.
The downhill assist control system indicator does not come on when the "DAC" switch
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is pressed.
The slip indicator comes on.
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In the above cases, have your vehicle checked by your Lexus dealer.
CAUTION
When using downhill assist control system
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Do not rely overmuch on the downhill assist control system. This function does not
extend the vehicle' s performance limitations. Always thoroughly check the road condi-
tions, and drive safely.
The system may not operate on the following surfaces, which may lead to an accident
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causing death or serious injury
Slippery surfaces such as wet or muddy roads
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Icy surface
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Unpaved roads
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GX460_OM_OM60L72U_(U)
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