ESP controls during understeer
The ESP system recognizes the directional angle with the steering wheel angle sensor and senses the
slipping route that occurs reversely against the vehicle cornering direction during understeer with the ya
w
rate sensor and lateral sensor. Then, the ESP system applies the braking force to the rear inner wheel to
compensate the yaw moment value. In this way, the vehicle does not lose its driving direction and the
driver can steer the vehicle as intended.
(2) Over steering
What is oversteering?
Oversteer is a term of a condition in which the steering wheel is steered to a certain angle during driving
and the rear tires slip outward losing traction.
Compared to understeering vehicles, it is hard to control the vehicle during cornering and the vehicle can
spin due to rear wheel moment when the rear tires lose traction and the vehicle speed increases.
ESP controls during oversteer
The ESP system recognizes the directional angle with the steering wheel angle sensor and senses the
slipping route that occurs towards the vehicle cornering direction during oversteer with the yaw rate
sensor and lateral sensor. Then the ESP system applies the braking force to the front outer wheel to
compensate the yaw moment value. In this way, the vehicle does not lose its driving direction and the
driver can steer the vehicle as intended.
3. CAUTIONS FOR AIR BAG SYSTEM
Cautions for air bag maintenance
Whenever installing or removing the devices related to the air bag system, disconnect the negative
battery cable and wait for at least 30 seconds.
Do not connect a tester probe to the inflator to measure the resistance of the component of the air
bag system. The detonator of the inflator may explode due to a sudden extra power supplied by the
tester.
Note that the used components related to the air bag system, especially the air bag unit, should be
packed in an air tight container and prevent it from any impact or damage.
When there is any deployed air bag (including curtain air bag and seat belt pretensioner), the entire
system including the air bag unit should be replaced. The deployed air bag unit should not be reused
since it has status data when it is deployed, and the data cannot be cleared with a diagnostic device.
The air bag and seat belt pretensioner systems contain explosive charges, so handle carefully when
disposing or replacing them. 1.
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Cautions for air bag maintenance
Do not modify, change or apply impact on any air bag component. The air bag may be deployed
abruptly, causing serious injuries.
Children and infants should ride in a rear seat. Seating in the passenger seat with carrying a
child or infant is strictly prohibited. An infant or a child could be severely injured by the air bag
deployment.
A child restraint system must not be installed on the front seat. An infant or a child could be severely
injured by the air bag deployment when it is fitted to the passenger seat.
Do not place any objects on the air bag inflation location. You may get injured by those objects during
deployment.
Never put your arms around the front seat from behind, lean on the front seatback, or put your arms
out of the window. You can severely injured when the side air bag deploys.
Never lean on the door since it becomes very dangerous when the side air bag deploys.
The side air bag deploys when there is a severe side collision.
Do not slam the front door to close it. The side air bag may deploy unexpectedly.
When an occupant fastens the seat belt in an unstable or inclined posture, the air bag system cannot
protect the occupant properly. Moreover, the occupant can be injured by the air bag.
Do not move your seat too close to the steering wheel or dashboard. Being too close to the
steering wheel or instrument panel during the air bag deployment could cause serious injury,
including death
Hold only the outer rim of the steering so that the air bag can inflate without any hindrance.
Do not incline toward the steering wheel. Never allow the passenger to put hands or feet on the dash
board. The air bag cannot work properly Do not hold and operate the steering wheel by crossing your
arms You could get seriously injured when the air bag deploys. 1.
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(3) Operating process
Driver seat
Passenger seat
For a vehicle with an active head restraint system, an active head restraint sensor is installed and its G
sensor is operated in the event of a rear-end collision. As the G sensor in the active head restraint
sensor is operated, the power is supplied to the driver's or passenger's active head restraint. Then, the
lock in the head restraint is disengaged and the front part of the head restraint is separated and moved
toward the neck of an occupant.
