A few days ago i went to start the wife's Yukon and got the start-run-quit sequence with the flashing security message. now it runs bit the security light stays on and kills the battery. replaced ignition cylinder, did relearn, checked for parasitic drain, all were either inconclusive or not the issue. Trich runs but both the daytime running lights and dome lights no longer work. also when i replaced the lock cylinder its started w/o the relearn like nothing was changed. any ideas? this is her dayly driver and we need it for a trip this weekend. any info or help is appreciated.