Didn't know Mondeo's had a spanner diagram.
This might help.
http://www.ilexa.co.uk/forum/index.php?board=11;action=display;threadid=352
" Re:Service Light on Mondeo
pull out the glove box and behind there is a button with a spanner on it hold it in and turn the ignition on keep finger on button till light goes out about 20 sec does it this should work i did it last week on a 1996 td". Eugene Walsh.