Volvo VR100 Operating Instructions Manual page 14

4 General Information
To unlock the radio, enter the four-digit
security code found on the removable label,
follow these instructions:
Turn SELECT to scroll to first number.
Press SELECT to select number.
Turn SELECT to scroll to second number.
Press SELECT to select number.
Turn SELECT to scroll to third number.
Press SELECT to select number.
Turn SELECT to scroll to fourth number.
Press SELECT to select number.
If the code is entered correctly, the radio will
switch to the last active mode (i.e. FM, CD,
etc.) and is ready to use.
If the code is entered incorrectly, you can try
2 more times. After 3 incorrect entries, the
radio will display "LOCK".
Note: The radio can NOT be manually
turned off, it remains ON with a lock code
message.
Note: To unlock code: Leave the battery and
ignition ON and uninterrupted for one hour.
Note: If your security code is lost, contact
your local Volvo dealer.