Lexus ES 250 Owner's Manual page 292

System overview
If the Parking Support Brake determines that a collision with a detected object or
pedestrian is possible, the engine output will be restricted to restrain any increase
in the vehicle speed. (Engine output restriction control: See figure 2 below.)
Additionally, if the accelerator pedal continues to be depressed, the brakes will be
applied automatically to reduce the vehicle speed. (Brake control: See figure 3
below.)
 Figure 1 When the PKSB (Parking Support Brake) is disabled
Engine output
A
Braking force
B
Time
C
 Figure 2 When engine output restriction control operates
4-5. Using the driving support systems
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