1964 caddy wiring help needed

as i'm preparing to rewire my 64 cdv, i'm puzzled by a small switch that is located on the back side of the center armrest.
my service manual shows nothing in the wiring diagrams, what the heck is it for?

 

You say this is on coupe de ville? On the Fleetwood 60 it controls the rear courtesy lights.

 

yes coupe deville.
same no?

 

what color are the wires? Courtesy lights used white and orange wires

 

These guys will be able to give whatever info you need
http://6364cadillac.multiply.com/

 

1964 Cadillac wiring diagrams here: http://www.tocmp.com/tOCMP/wiring/5765wiring diagrams/cadillacindex.htm