2013 Lexus LX 570 Owners Manual - Page 332

2-4. Using other driving systems n Propeller shaft noise 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. n 4-Wheel AHC failure warning 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 operating correctly. If the warning message continues to be displayed, have the vehicle checked at your Lexus dealer as soon as possible. 326 LX570_U (OM60G53U)