Keyless Entry for 2002 Passport?

I just picked up a 2002 Honda Passport. The previous owner decided not to spring for the keyless entry option at the time she purchased it. :screwy: My question is, do isuzu rodeos and honda passports come with keyless entry systems pre-installed from the factory? Should the only piece of equipment I need to purchase be a fob or do I need to purchase additional equipment?

Thanks for the help.