2000 Honda CR-V SE. Audio: radio, CD, Cassette. After Car Battery reconnected,

all honda/acura are designed do that anytime you disconnect the battery with the factory installed radio. this information is in your owners manual.see the youtube video below in Pushrods answer.Oh,and by the way,the CODE you need to enter is on a label inside your glove box,so no need to call the dealer.

You need to call the Honda dealer and get the 4 pin code to get the radio back on. Next time have a battery saver on the car before changing the battery there for you will not loose any save memory setting in the car. Most all new car will loose all the setting such as seat, radio, heat and Ac, wiper, and many more and these thing takes time to put all the setting back in the car Thank you Bills On Broadway

https://youtu.be/b0GNkf-BDXs .

UNLESS yours has NAVI , (which I doubt it does) , it is a five digit code. You will need the radio serial # in order for the dealer (or me) to look it up. REMOTE possibility , if you respond to either of your posts , that I can tell you a way to get the serial # if you have not found either that or the code yet.