2011 Lexus RX 450h Owners Manual - Page 262

2-1. Driving procedures n Operation of the air conditioning system in Eco drive mode Eco drive mode controls the heating/cooling operations and fan speed of the air conditioning system to enhance fuel efficiency. (→P. 300) To improve air conditioning performance, adjust the fan speed or turn off Eco drive mode. n Automatic return to normal driving mode If snow mode or EV drive mode is selected, the driving mode will automatically return to normal mode when the hybrid system is turned off. n S mode l When the shift range is "5" or lower, holding the shift lever toward "+" sets the shift range to "6". l To prevent the engine from over-revving, upshifting may automatically occur. n AI-SHIFT AI-SHIFT automatically selects the optimal gear according to driver performance and driving conditions. AI-SHIFT automatically operates when the shift lever is in the D position. (Shifting the shift lever to the S position cancels the function.) n When driving with the cruise control or dynamic radar cruise control Engine braking will not occur in S mode, even when downshifting to "5" or "4". (→P. 223, 227) n If the shift lever cannot be shifted from P →P. 622 n If S does not come on even after shifting the shift lever to S This may indicate a malfunction in the hybrid transmission system. Have the vehicle inspected by your Lexus dealer immediately. (In this situation, the hybrid transmission will operate in the same as manner as when the shift lever is in D.) n Downshift restriction warning buzzer (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 buzzer will sound twice.) 178