Lexus 2013 IS250 Owner's Manual page 200

198
4-2. Driving procedures
Selecting gears in the M position
To enter M mode, shift the shift lever to M. Gears can then be selected by
operating the shift lever or paddle shift switches, allowing you to drive in
the gear of your choice.
1
Upshifting
2
Downshifting
The gear changes once every time
the shift lever or paddle shift switch
is operated.
The selected gear, from M1 to M6,
will be fixed and displayed in the
meter.
When in the M position, the gear will not change unless the shift lever
or paddle shift switches are operated.
However, even when in the M position, the gears will be automatically
changed in the following situation:

When vehicle speed drops (downshift only).

When the automatic transmission fluid or engine coolant tempera-
ture is low.

When automatic transmission fluid temperature is high.

When the needle of the tachometer is in the red zone (the range
which exceeds the allowable revs of the engine).
In the following situations, the gear will not shift even if the shift lever
or paddle shift switches are operated.

"1st Gear not available due to slippery road surface" is displayed on
the multi information display.

The vehicle speed is low (upshift only).
IS250_EE(OM53B11E)