You can reset your ECM any one of three ways:
1) pull the 7.5a "Back up" fuse in the engine bay

2) disconnect the negative battery lead

3) disconnect the plugs at the ECM for 10 seconds

I usually do #3 because I'm lazy and don't like redoing the settings on my deck(even though I don't have an antenna, so there are no presets to re-enter)