Hello! I got a problem with my car cd/radio when I changed my battery it asks for a 4-digit code. My car is Nissan Primera 2000 P11-144, radio/cd is Clarion CAA-355 with CL0340Y0123516 stamped on it's 6-disc slot. I'm not sure if it's the right serial number as I don't know how to remove the radio from the dashboard. Thank you very much.