If 0000 does not work as Philip suggested,

1. disconnect the battery for 1 minute
2. reconnect the battery, alarm will be blasting for about 45 sec
3. turn key to the second position
4. a 15 minute count down should be activated in display
5. at the end of the 15 min. count down, you should be able to start the X

There may be more detailed instructions in the owners manual.

GL, Rob_