major problem with rsx doorlocks

The #9 fuse is also part of the radio circuit .. when you were messing w/ the radio wires, you created a short (you now know exactly what this is.. ) and you caused a tremendous amount of current to be drawn through that 7.5A fuse - causing it to blow.  Now, why did your radio still work?  B/c, just like your doorlock system, the radio system draws power from several different power sources .. including that common 7.5A fuse.  The radio was probably still 90% functional ... enough for you not to see any differences.. until you discovered the doorlock issue.