Lexus LX 570 2016 Service Manual page 302

302
4-5. Using the driving support systems
In the following cases the 4-Wheel AHC will not operate
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The brake pedal has been depressed for a few seconds or longer while the vehicle is
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stopped.
Vehicle height control has not been frequently used.
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The suspension fluid temperature is lower than -22°F (-30°C).
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There is ice on the suspension.
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Driving on bumpy roads which may cause the suspension to fully elongate.
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If the steering wheel is abruptly turned more than 3/4 of a revolution with the center
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differential lock system activated.
Cold weather operation
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It may take longer for the vehicle height to change if the suspension fluid temperature
drops below 5°F (-15°C).
The 4-Wheel AHC does not operate when the suspension fluid temperature drops
below -22°F (-30°C).
In this case, even if the height select switch is pressed, the vehicle height will not change.
●
Once the vehicle has been driven for a short time and the suspension fluid has been
warmed to within normal operating limits, the 4-Wheel AHC will begin operating and
the vehicle height will automatically change to the selected mode.
When the suspension fluid is around -22°F (-30°C), the vehicle height may not be able
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to be raised, even if the 4-Wheel AHC is operating. In this case, pull the height select
switch to "" then push to "" after driving for a short time longer to select the desired
vehicle height.
Parking and stopping tips
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If you immediately stop the engine after off-road driving, the vehicle height may gradu-
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ally lower. When parking, make sure there is nothing under the vehicle that may come
in contact with the underbody. The vehicle will return to the set height when the engine
is started.
The vehicle height may change as the temperature changes when the engine is
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stopped. The vehicle will return to the set height when the engine is started.
Propeller shaft noise
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If the vehicle height is adjusted on a slope, or with the shift lever in a position other than P
or N while the vehicle is stopped, you may hear a sound caused by the expansion and
contraction of the propeller shaft. This does not indicate a malfunction.
4-Wheel AHC failure warning
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If a malfunction occurs in the 4-Wheel AHC, normal mode is automatically selected.
However, the system may not switch to normal mode depending on the location of the
malfunction.
The warning message is displayed on the multi-information display, and the 4-Wheel
AHC cannot be activated until the malfunction is corrected.
Stop the engine and start it again. If the warning message turns off, the system is operat-
ing correctly. If the warning message continues to be displayed, have the vehicle checked
at your Lexus dealer as soon as possible.
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