code for car cassette/radio ford 5000 rds e-o-n?

Hi, I bought a second hand ford escort 1996, but i don't have the code to unlok the radio.
The serial No. is ( M156355 )
The part No. is ( 97AP-18K876-LA )
Is it pssible to have the code please?

I have also another problem:
I think that the radio wasn't istalled in this car and the connections are all mixed up.
Is it pssible also to have the eletric wiring diagram of the radio?
Thank for your atention

Lucio
February 2008