2008 Lexus IS 250 Owners Manual - Page 124

2-1. Driving procedures n Gear position display when driving in S mode The current gear is displayed on the multi-information display. (→P. 142) n Downshifting 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 or shift paddle switch is operated. (The warning buzzer will sound twice.) n When driving with the cruise control system or dynamic radar cruise control sys- 2 tem The engine brake will not operate in the S mode, even when downshifting to 5 or 4. (→P. 152, 155) n Snow mode automatic deactivation When driving Snow mode is automatically deactivated if the "ENGINE START STOP" switch is turned off after driving in snow mode. n If the shift lever cannot be shifted from P →P. 392 n If 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.) n AI-SHIFT The AI-SHIFT automatically shifts the gear to the optimal position according to the driver performance and driving conditions. The AI-SHIFT automatically operates when the shift lever is in the D position. (Shifting the shift lever to the S position cancels the function.) 125