Volvo XC90: Starting and driving / Trailer Stability Assist
(Option/accessory.)
Trailer Stability Assist (TSA1) is part of the ESC2 stability system and is a function designed to help stabilize a vehicle that is towing a trailer when the vehicle and trailer have begun to sway. The function is added when installing a towbar. Contact a Volvo retailer for more information.
Reasons for swaying
A vehicle towing a trailer may begin to sway for various reasons. Normally this only occurs at high speeds. However, if the trailer is overloaded or unevenly distributed, e.g. too far back, there is a risk of swaying even at low speeds.
Swaying may be caused by factors such as:
- The vehicle and trailer are hit by a sudden, strong crosswind.
- The vehicle and trailer are traveling on an uneven road or over a bump.
- Sudden movements of the steering wheel.
Once swaying has begun, it can be difficult or impossible to stop it. This makes the vehicle and trailer difficult to control and there is a risk of swerving into oncoming traffic or driving off the road.
Trailer Stability Assist function
Trailer Stability Assist continuously monitors the vehicle's movements, particularly lateral movements. If swaying is detected, the brakes are applied individually on the front wheels, which has a stabilizing effect on the vehicle and trailer. This is often enough to enable the driver to regain control of the vehicle.
If the Trailer Stability Assist function's first attempt is not adequate to stop the swaying motion, the brakes are applied on all wheels and engine power is temporarily reduced. As the swaying motion begins to decrease and the vehicle and trailer have once again become stable, TSA stops regulating the brakes/engine power and the driver regains control of the vehicle.
NOTE
Trailer Stability Assist is deactivated if the driver activates ESC Sport Mode in the center display's menu system.
Trailer Stability Assist may not intervene if the driver tries to compensate for the swaying motion by moving the steering wheel rapidly, because the system will then not be able to determine if it is the trailer or the driver causing the swaying.
When Trailer Stability Assist is
activated, the ESC symbol is displayed in the instrument panel.
NOTE
A vehicle software update is required when a towbar is retrofitted. Contact a Volvo retailer.
1 Trailer Stability Assist
2 Electronic Stability Control
Driving with a trailer
There are a number of things to consider when towing a trailer, such as the
towbar, the trailer and how the load is distributed in the trailer.
Load-carrying capacity is determined by the vehicle's curb weight...
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 instrument panel...
Other information:
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Volvo XC90 2015-2024 Owners Manual: Brake functions
The vehicle's brakes are used to reduce speed or prevent the vehicle from rolling. In addition to the wheel brakes and parking brakes, the vehicle is also equipped with a number of automatic brake assist functions. These systems provide assistance by e.g. the driver not needing to depress the brake pedal at a traffic light, when starting up a hill or when driving down a hill. Depending on how ..
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Connecting equipment to the vehicle's data link connector
Incorrectly connected or installed software or diagnostic tools may have an adverse effect on the vehicle's electronics.
We strongly recommend that Volvo owners use only genuine, Volvo-approved accessories, and that accessory installations be performed only by a trained and qualified Volvo service technician. Certain accessories only work when the associated software is installed in the vehicle's computer system.
On-board Diagnostic (OBDII) socket under the dashboard on the driver's side.
