2009 Toyota Avalon Owners Manual - Page 163

2-1. Driving procedures n Down shifting restrictions warning buzzer (in the "S" mode) To help ensure safety and driving performance, downshifting operation may sometimes be restricted. In some circumstances, downshifting may not be possible even when the shift lever is operated. (The warning buzzer will sound twice.) n When driving with the cruise control system (or dynamic laser cruise control system) The engine brake will not operate in the "S" mode, even when downshifting to "5" or "4". (→P. 158, 161) n If the shift lever cannot be shifted from "P" →P. 408 n If the "S" indicator does not come on even after shifting the shift lever to "S" mode driving position This may indicate a malfunction in the automatic transmission system. Have the vehicle inspected by your Toyota dealer immediately. (In this situation, the vehicle will operate as if the shift lever is in "D".) n AI-SHIFT The 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. (Shifting the shift lever to the "S" mode driving position cancels the function.) 2 When driving 137