Checking Trailer Lamps - Volvo XC90 2019 Owner's Manual

STARTING AND DRIVING
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eral movements. If snaking is detected, the
front wheels are individually braked. This
serves to stabilise 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 gradually 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
display.
Trailer stability assist may fail to intervene if
the driver uses severe steering wheel move-
ments to try to rectify the snaking because in
such a situation the system cannot determine
whether it is the trailer or the driver causing
the snaking.
516
When Trailer Stability Assist
(TSA) is operating, the ESC
symbol flashes in the driver
display.
Related information
Driving with a trailer (p. 514)
•
Electronic stability control (p. 305)
•

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 indica-
tors 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 direc-
tion indicators will also flash more quickly than
normal.
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