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:
Three-way catalytic converter
Keep your engine properly tuned. Certain engine malfunctions, particularly
involving the electrical, fuel or distributor ignition systems, may cause unusually
high threeway catalytic converter temperatures. Do not continue to operate your
vehicle if you detect engine misfire, noticeable loss of power or other unusual
operating conditions, such as engine over..
Activating and deactivating
An integrated compass1 in the upper right corner of the rearview
mirror shows the direction the vehicle is traveling.
The compass is automatically activated when the vehicle is started.
To deactivate/activate the compass manually:
Use a paper clip or similar object to press the button on the bottom of
the mirror.
If the compass is deactivated when the vehicle is ..