Lexus GS 450h 2008 Owner's Manual page 147

Downshifting restrictions warning buzzer (in the "S" mode)
■
To help ensure safety and driving performance, downshifting operation may some-
times be restricted. In some circumstances, downshifting may not be possible even
when the shift lever is operated. (The warning buzzer will sound twice.)
When 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. 169)
Snow mode automatic deactivation
■
Snow mode is automatically deactivated if the "POWER" switch is turned to
ACCESSORY or ON mode after driving in snow mode.
If the shift lever cannot be shifted from "P"
■
→P. 529
If the indicator does not come on even after shifting the shift lever to "S"
■
This may indicate a malfunction in the transmission. Have the vehicle inspected by
your Lexus dealer immediately.
(In this situation, the vehicle will operate as if the shift lever is in "D".)
When in heavy traffic
■
To avoid running the hybrid battery (traction battery) down, leave the shift lever in
"D" or "S".
2-1. Driving procedures
2
145