Lexus GS300 1998 Owner's Manual page 277

STARTING AND DRIVING
"The shift position is displayed on the instrument cluster.
GS300:
P: Parking, engine starting and key removal position
R: Reverse position
N: Neutral position
D: Normal driving position (Shifting into overdrive
possible)
4: Position for engine braking (Shifting into overdrive
not possible)
When the cruise control is being used, even if you
downshift from "D" to "4", engine braking will not be
applied because the cruise control is not cancelled. For
the operation to decrease the vehicle speed, see page
283.
3, 2: Position for more powerful engine braking
L: Position for maximum engine braking
264
GS400:
P: Parking, engine starting and key removal position
R: Reverse position
N: Neutral position
D: Normal driving position (Shifting into overdrive
possible)
M: Position for manual shifting up or downshifting
When the cruise control is being used, even if you
downshift from "D" to "4", engine braking will not be
applied because the cruise control is not cancelled. For
the operation to decrease the vehicle speed, see page
283.
3, 2: Position for more powerful engine braking
L: Position for maximum engine braking