2009 Lexus LX 570 Owners Manual - Page 248

2-4. Using other driving systems n Propeller shaft noise If the vehicle height is adjusted on a slope, or with the selector 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. n Continued system operation Even if the engine is stopped while the vehicle height is being lowered, operation will continue for up to 30 seconds. n 4-Wheel AHC failure warning If a malfunction occurs in the 4-Wheel AHC or AVS system, 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 4Wheel 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 operating correctly. If the warning message continues to be displayed, have the vehicle checked at your Lexus dealer as soon as possible. 250