I seem to have locked myself out of mine too, didn't read the instructions (or rather the misses didn't whilst poking things when I was driving).
Have just stuck the radio on and locked it up, will go and check it at lunch. Just out of curiosity, when I go back to it, should it have moved into 'code 1000' mode? or do I need to flick it off and on again?
Cheers,
Doug