what brand bro? OEM Honda or aftermarket?
we need more info.
since u said card, it maybe aftermarket brands, since OEM honda radio codes were never stored in cards or whatsoever.
bein...there is a card given by Honda n in the card stated the pin number....u have to enter the pin in order to make the system operates...i had mine for my ol oem "prestigious" player...no longer serving due to display faded..