The codes you pasted seem extremely short. The result of those is that you are sending out a signal at (erm, not sure how to translate 5c into Hz, anyone?) that is simply 0001 2403 once, and 0003 0004 over and over again. It is possible that the Pace uses something like this, but quite unlikely. Other remotes send between 10 and 20 times as much as that.

My only suggestion is to try some of the techniques that Daniel mentions in one of his documents to try and get a clear signal.

If you can get pace to give you details on exactly what the pace is expecting (lead in/lead out, frequency, bit patterns, 0 representation, 0 representation etc..), you might be able to get somewhere.. This can be rather difficult to get however, I know Kenwood were of no help at all when I asked them.