When does BLIS function

When does BLIS function  - Blind Spot Information System - Starting and driving - Volvo XC90 Owners Manual - Volvo XC90

The system functions when your vehicle is moving at speeds above 6 mph (10 km/h).

When you pass another vehicle:

The system reacts when you pass another vehicle at a speed of up to 6 mph (10 km/h) faster than that vehicle.

When you are passed by another vehicle:

The system reacts if your vehicle is passed by another vehicle at a speed of up to 43 mph (70 km/h) faster than your vehicle.

WARNING
Х BLIS does not function in sharp curves.
Х BLIS does not function when your vehicle is backing up.
Х If you are towing a wide trailer, this may prevent the BLIS cameras from detecting other vehicles in adjacent lanes.

    See also:

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    On/Off button
    To activate the system: 1. Turn the ignition key to position I. NOTE If you switch off the ignition while the audio system is on, the system will be on when the ignition is switched on again. ...