bypassing security code

I am not the first owner of a '98 S70 in which the battery was recently
unintentionally discharged. I was aware that a four digit code is required
to reactivate the radio, but I never received this code. Someone said that
if one simply leaves the radio on for a period of time (I've forgotten how
long) the radio will reset itself without the code. Is this true?

 

No. Drive to your nearest Volvo dealer. From the VIN, they can find
out the code for you. If the radio has been replaced, they will need
to find out the radio serial number. A good dealer will not charge
for this service.

 

IF YOU LEAVE A 9 VOLT BATTERY CONNECTED TO YOUR CIG LIGHTER THE SYSTEM HOLDS
THE RADIO SETTINGS AS WELL I THINK THE RADIO CODE .I HAVE LEFT MY CELL PHONE
ON AND IT DISCHARGES INTO THE CAR KEEPING THE ANTENNA UP TILL THE PHONE IS
REMOVED .