Ford doesn’t host old car radio manuals publicly anymore, but try these sources:
If you are looking for the manual to understand how to operate the radio, here are the core functions usually detailed in the factory guide: 1. Entering the Security Key (Radio Code)
If you cannot find the physical or digital manual, these universal operating steps will cover 90% of your daily interactions with the Ford CDR 4600. 1. Entering the Security Key Code