Volvo XC90: Audio, media and internet / HD Radio™ sub-channels
In many cases, a main HD Radio station (FM wavebands only) will also have sub-channels
offering additional types of programming or music.
Sub-channels

Example of an HD Radio station with sub-channels
If any sub-channels are available, they will listed below the main channel on
the screen. In this example, WILD-FM HD2 is a sub-channel.
Selecting sub-channels
To listen to a station's sub-channel(s), tap the station on the screen or press
the forward/ back arrow keys on the right-side steering wheel keypad or below the
screen.
Sub-channels can also be saved as radio favorites.
If you tap a sub-channel favorite, it may take up to 6 seconds before
the channel becomes audible. If you tap a station while you are out of digital range
of the transmitter, No reception will be displayed.
HD Radio is deactivated when the car leaves the factory.
When listening to an HD Radio station and driving through areas with weak HD
signals (fringe areas), you may experience that the radio repeatedly switches between
analog/digital and digital/analog reception...
Limitations
Main channel vs. sub-channels (FM only): The main channel is the
only channel that can receive in hybrid mode (both digital and analog)...
Other information:
(Option/accessory)
Clean Zone Interior Package (CZIP) is a series of modifications that filters
even more allergy and asthma-inducing substances and other pollutants from the passenger
compartment. CZIP includes the following:
An enhanced function that starts the blower when the vehicle is unlocked
using the remote key...
The time interval to the vehicle ahead can be set for the functions Adaptive
Cruise Control*, Pilot Assist* and Distance Alert*.
Different time intervals to the
vehicle ahead can be selected and are shown in the instrument panel as 1–5 horizontal
bars...