Classic symptoms of a dirty or misaligned Face Plate on the Head Unit.
Remove the Face Plate and with a cotton swab and some alcohol, clean all the brass contacts on both the Face Plate and Head Unit. Then, carefully re-install the Face Plate so all the contacts are aligned properly.
All the control functions occur in the Face Plate. If the contacts are dirty or misaligned, these cannot be communicated to the Head Unit and/or CD Player.
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