Volvo XC90: Starting and driving / Activating and deactivating Eco drive mode using the function button
There is a function button for Eco drive mode in the center display's Function
view if the vehicle is not equipped with a drive mode control in the tunnel console.
When the engine is switched off, Eco mode is deactivated and must therefore be
reactivated each time the engine is started. ECO will be displayed in the
instrument panel when the function is activated.
Selecting Eco drive mode in the center display's Function view
Tap the Driving Mode ECO button to activate or deactivate the function.

An indicator light in the button will illuminate when the function is activated.
Eco drive mode can help make driving more fuel-efficient and eco-friendly.
Use this mode to save fuel and promote ecofriendly driving.
When Eco mode is activated, the following characteristics are modified:
The automatic transmission's shifting points...
Start/Stop is a function that temporarily switches off the engine when the
vehicle has stopped, e.g. at a traffic light or in heavy traffic, and then starts
it again automatically when needed...
Other information:
The digital Owner's Manual can be accessed from the center display's Top view.
The contents are searchable and the sections are designed to be easy to navigate.
The Owner's Manual is accessed from Top view.
To open the Owner's Manual, pull down Top view in the center display and
tap Owner's manual...
The vehicle's ignition can be put in various modes (levels) to make different
functions available.
To enable the use of a limited number of functions when the engine is not running,
the ignition can be put in one of three different levels: 0, I and
II...