Lexus RX450H Manual page 232


AI-SHIFT
AI-SHIFT automatically selects the suitable gear according to driver perfor-
mance 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.)

When driving with cruise control or radar cruise control activated
Even when performing the following actions with the intent of enabling
engine braking, engine braking will not activate because cruise control or
radar cruise control will not be canceled.

While driving in D or S mode, downshifting to 5 or 4. (P. 250, 254)

When switching the driving mode to sport mode while driving in D posi-
tion. (P. 214)

If the shift lever cannot be shifted from P
P. 605

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 any authorized Lexus dealer or repairer, or another
duly qualified and equipped professional immediately.
(In this situation, the hybrid transmission will operate in the same as manner
as when the shift lever is in D.)

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.)
CAUTION

When driving on slippery road surfaces
Do not accelerate or shift gears suddenly.
Sudden changes in engine braking may cause the vehicle to spin or skid,
resulting in an accident.
RX450h_EE
2-1. Driving procedures
2
217