I have a Jeep cherokee 2002 model and i do not remember the radio code, what is the factory code....

Hi,
There is no standard master code for these radios. Each code is individual to the radio and specific to its serial number. You will need to remove the radio from the dash and find the serial number on the label at the back or sometimes it is stamped into the metal case of the radio.
For Jeep codes I can recommend this site which is one of a very few that I can guarantee to do these Chrysler codes online direct from the serial number and it is certainly the cheapest around that I know of.
The alternative is to contact your local Chrysler dealer with the details of the serial but expect to pay a premium price at the dealer if you decide to do it this way.
Thanks for using FixYa.