Volvo 2006 XC70 Owner's Manual page 193

Automatic Frequency update
(AF)
The AF function tunes to the strongest
transmitter for the current station, if that
station supports alternative frequencies. AF is
OFF by default.
To activate/deactivate AF:
To reactivate the function, follow the proce-
dure above and select AF ON in step 5.
Resetting RBDS functions
RBDS functions can be returned to their
factory settings as follows:
RBDS functions
ASC - speed compensated
volume
The audio system's volume is adjusted
automatically according to the speed of the
vehicle. There are three settings available: low,
medium, or high.
To activate ASC:
NOTE:
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