2005 Lexus LS 430 Owners Manual - Page 351

STARTING AND DRIVING (c) Using engine braking Vehicles with the cruise control - When the cruise control is being used, even if you downshift from "D" or "6" (sixth range) to "5" (fifth range), engine braking will not be enabled because the cruise control is not cancelled. For vehicle speed reduction, see page 329. Vehicles with the dynamic radar/laser cruise control - When the cruise control is being used in the conventional (fixed speed) cruise control mode or in the vehicle−to−vehicle distance control mode, even if you downshift from "D" or "6" (sixth range) to "5" (fifth range), engine braking will not be enabled because the cruise control is not cancelled. For vehicle speed reduction, see pages 360 and 345. D Shift into the "4" (fourth range) position. The transmission will downshift to fourth gear when the vehicle speed is or becomes lower than 197 km/h (122 mph) and more powerful engine braking will be enabled. If you drive in the "D" position: Shift the selector lever to the "S" position and shift the lever down to the "-" position once to select "4" (fourth range). However, when you move the lever to the "S" position while the AI shifting control is operating, the first shift range will be "5" (fifth range), "4" (fourth range) or "3" (third range) because the suitable shift range is selected depending on the driving condition. If you drive in the "S" position: Shift the selector lever down to the "-" position to select the "4" (fourth range). 31L327 " "S" mode position To use the braking power of the engine, downshift the range in the "S" mode position as follows: D Shift into the "5" (fifth range) position. The transmission will downshift to fifth gear and engine braking will be enabled. If you drive in the "D" position: Shift the selector lever to the "S" position and "5" (fifth range) will automatically be selected. If you drive in the "S" position: Shift the selector lever down to the "-" position by selecting the "5" (fifth range). 312