1032-1. Driving procedures2When drivingnDownshifting restrictions in "S" modeThe shift lever cannot be downshifted if the following speeds are exceeded. (The warning buzzer will sound twice in this situation.)The maximum speeds can get lower when the engine is not warm such as in cold climates or before warm-up.nWhen driving with the cruise control system (or dynamic radar cruise control sys -tem)The engine brake will not operate in the "S" mode, even when downshifting to "5" or "4". ( →P. 124 , 127)nSnow mode automatic deactivationSnow mode is automatically deactivated if the engine switch is turned to "ACC" or "IG-ON" mode after driving in snow mode. nIf the shift lever cannot be shifted from "P"→ P. 484nIf the indicator does not come on even after shifting the shift lever to "S"This may indicate a malfunction in the automatic transmission system. Have the vehicle inspected by your Lexus dealer immediately. (In this situation, the vehicle will operate as if the shift lever is in "D".)nAI-SHIFTThe AI-SHIFT automatically shifts the gear to the optimal position according to the driver's input and driving conditions. The AI-SHIFT automatically operates when the shift lever is in the D position. (Shift -ing the shift lever to the S position cancels the function.)DownshiftingMaximum speed mph (km/h)GS430 GS3505 → 4 120 (194) 124 (200)4 → 3 88 (142) 87 (141)3 → 2 59 (95) 56 (91)2 → 1 24 (38) 28 (45)
