Volvo XC90 Twin Engine 2019, Owner'S Manual

Page: 499 / 700

STARTING AND DRIVING
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497
Trailer stability assist function
The trailer stability assist function continually
monitors the car's 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 that
trailer stability assist intervenes, the car/trailer
combination is braked with all wheels and engine
power is reduced. Once snaking has been gradu-
ally suppressed and the car/trailer combination is
stable once again, the system stops regulating
and the driver once again has full control of the
car.
NOTE
The stability function is deactivated if the
driver selects Sport mode by deactivating
ESC via the menu system in the centre dis-
play.
Trailer stability assist may fail to intervene if the
driver uses severe steering wheel movements to
try to rectify the snaking because in such a situa-
tion the system cannot determine whether it is
the trailer or the driver causing the snaking.
When Trailer Stability Assist
(TSA) is operating, the ESC
symbol flashes in the driver dis-
play.
Related information
•
Driving with a trailer (p. 495)
•
Electronic stability control (p. 291)
Checking trailer lamps
When connecting a trailer - check that all the
trailer lamps work before departure.
Direction indicators and brake lights on
the trailer
If one or more of the trailer's direction indicators
or brake light bulbs is broken, the driver display
shows a symbol and a message. Other lights on
the trailer must be checked manually by the
driver before setting off.
Symbol Message
•
Trailer turn indicator Right
turn indicator malfunction
•
Trailer turn indicator Left
turn indicator malfunction
•
Trailer brake light Malfunc-
tion
If any lamp for the trailer's direction indicators is
broken, the driver display symbol for direction
indicators will also flash more quickly than nor-
mal.
Rear fog lamp on trailer
When connecting the trailer, the rear fog lamp
may not light up on the car. In such cases, the
rear fog lamp function switches to the trailer.
Upon activation of the rear fog lamp, check