If you have a radio which had a face plate, you must have the removal tools
for the head unit.  Kenwood and others have small blades which slide in the
front on both sides and release the head unit from the metal box.

Once the head unit is released, disconnect the antenna and harness plug ,
slide the unit out and unbend the tabs for the metal box and remove.

Or better yet, get a new face plate if the unit is working and save yourself
the hassle.

Malibu Tony 85' Westy ....Kenwood cd/cassette w/ magazine changer under
drivers seat space.