It is different for every car. It is a 5-number code that may be found in any of several places. If you have the owner's manual, check to see if there is a card tucked in there. You can open the glove compartment and check the side for a sticker. Some have found it under the coin box. I am having trouble finding mine. If you can't find it you can call Acura but you'll need to remove the radio to get the unit's serial number.
Jake G., March 2007