Radio Code

I've seen reference to this code but no instruction on how to put it
in or get it out......
How do you determine the code?
can you change it?
how do you enter it.
I just bought a used car and the owner had no idea.
there's no owners manual
Chiltons gives no instruction....surprising.
thanks

 

If you have a radio that requires a security code, you can get that code
from the dealer. All you need is the radio serial number. Remove the
radio, get the serial number, take it (and proof of ownership) to the
dealer, and ask him to look up your code for you. Decent dealers will
do so for no charge.

Or, if you don't know how to remove the radio, the dealership will do
that for their regular rate.