Volvo XC90 2021 Owner's Manual page 462

STARTING AND DRIVING
Checking trailer lights
When connecting a trailer, make sure that all
of the lights on the trailer are functioning
before starting to drive.
Trailer turn signals and brake lights
If one or more of the turn signals or brake
lights on the trailer is not working, a symbol
and message will be displayed in the instru-
ment panel. The other lights on the trailer
must be checked manually by the driver before
the vehicle is driven.
Symbol Message
Trailer turn indicator Right
•
turn indicator malfunction
Trailer turn indicator Left
•
turn indicator malfunction
Trailer brake light Malfunc-
•
tion
If any of the trailer's turn signal lights is not
working, the turn signal symbol in the instru-
ment panel will also flash more quickly than
normal.
Trailer rear fog light
When a trailer is connected, the vehicle's rear
fog light may not illuminate and rear fog light
functionality is instead transferred to the
460
trailer. If this is the case, check to see if the
trailer is equipped with a rear fog light before
activating the vehicle's fog lights when driving
with a trailer to help ensure safe operation.
Checking trailer lights*
Automatic check
When the trailer has been connected to the
vehicle's electrical system, its lights can be
checked by automatically activating them.
This function helps the driver check that the
trailer's lights are functioning correctly before
starting to drive.
In order to perform this check, the vehicle
must be switched off.
1. When a trailer is connected to the towbar,
the message Automatic Trailer Lamp
Check
will appear in the instrument panel.
2. Acknowledge the message by pressing
the O button on the right-side steering
wheel keypad.
> The light check will begin.
3. Get out of the vehicle to perform the
check.
> All of the lights on the trailer will begin
flashing, and then illuminate separately
one at a time.
4. Visually check that all of the trailer's lights
are functioning correctly.
5. After a short time, all of the trailer's lights
will start flashing again.
> The light check is completed.
Disabling the automatic check
The automatic light check can be disabled in
the center display.
1. Tap Settings in the Top view.
2. Tap My Car Lights and
3. Deselect Automatic Trailer Lamp
Check
.
Manual check
If the automatic check has been disabled, the
check can be started manually.
1. Tap Settings in the Top view.
2. Tap My Car Lights and
3. Select Manual Trailer Lamp Check
> The light check will begin. Get out of
the vehicle to perform the check.
Related information
Driving with a trailer (p. 457)
•
* Option/accessory.
Lighting.
Lighting.
.