Driving Assist Systems - Lexus IS250 2009 Service Manual

2-4. Using other driving systems

Driving assist systems

To help enhance driving safety and performance, the following systems
operate automatically in response to various driving situations. Be aware,
however, that these systems are supplementary and should not be relied
upon too heavily when operating the vehicle.
ABS (Anti-lock Brake System)
n
Helps to prevent wheel lock when the brakes are applied suddenly, or if
the brakes are applied while driving on a slippery road surface.
Brake assist
n
Generates an increased level of braking force after the brake pedal is
depressed, when the system detects a panic stop situation.
VSC (Vehicle Stability Control)
n
Helps the driver to control skidding when swerving suddenly or turning on
slippery road surfaces.
TRAC (Traction Control)
n
Maintains drive power and prevents the rear wheels (2WD models) or all
wheels (AWD models) from spinning when starting the vehicle or acceler-
ating on slippery roads.
Hill-start assist control (vehicles with an automatic transmission)
n
Prevents the vehicle from rolling backwards when starting on an incline or
slippery slope.
EPS (Electric Power Steering)
n
Employs an electric motor to reduce the amount of effort needed to turn
the steering wheel.
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