I have an Acura Integra I recently bought and the radio
Won't work with out the code. I manage to get the serial
Number of the radio.
Serial # ML 27641
Model number# 39100-SK7-A020-M1
Ref number# (KEH-6261 zh) I believe
Take it to a dealership and they should be able to get the code for you. If they can't then you will probably have to contact Pioneer and see if they can get the code for you