||
STARTING AND DRIVING
* Option/accessory.
310
Push the protective cover until it snaps tight.
Related information
•Detachable towbar* - storage (p. 306)
•Detachable towbar* - specifications (p. 307)
•Driving with a trailer (p. 303)
Trailer Stability Assist - TSA15
The trailer stability assist TSA (Trailer Stability
Assist) function is designed to stabilise the car
and trailer combination if it begins to snake.
TSA- the function is included in the stability sys-
tem (p. 186) ESC16.
Function
The snaking phenomenon can occur with any
car/trailer combination. Snaking normally occurs
at high speeds. But, there is a risk of it occurring
at lower speeds if the trailer is overloaded or the
load is improperly distributed, e.g. too far back.
In order for snaking to occur, there must be a
triggering factor, e.g.:
•Car with trailer subjected to a sudden and
powerful side wind.
•Car with trailer drives on an uneven road sur-
face or in a pothole.
•Sweeping steering wheel movements.
Operation
If snaking has started, it could be difficult or even
impossible to suppress. This makes the car/
trailer combination difficult to control and there is
a risk that you could, for example, end up in the
wrong lane or leave the carriageway.
The trailer stability assist function continually
monitors car movements, particularly lateral
movements. If snaking is detected, the front
wheels are individually braked. This serves to sta-
bilise the car/trailer combination. This is often
enough to help the driver regain control of the
car.
If snaking is not eliminated the first time the TSA
system comes into action, the car/trailer combi-
nation is braked with all wheels and engine
power is reduced. Once snaking has been gradu-
ally suppressed and the car/trailer combination is
once again stable, the TSA system stops regulat-
ing and the driver once again has full control of
the car. For more information, see Electronic sta-
bility control (ESC) - general (p. 186).
Miscellaneous
Engagement of the TSA system may take place
at higher speeds.
NOTE
TSA function is switched off if the driver
selects Sport mode, see Electronic stability
control (ESC) - general (p. 186).
TSA may fail to engage if the driver uses severe
steering wheel movements to try to rectify the
snaking because in such a situation the TSA sys-
15 Included in the installation of Volvo genuine towbar.
16 (Electronic Stability Control) - Electronic stability control.
