How can I prevent the anti-theft system from engaging while vehicle car is off? on 2006 Chevrolet Malibu Maxx

Car is parked, engine & all accessories off for as long as 2 or 3 hours. Suddenly the horn will start blowing & the lights will begin flashing.

by in Germantown, WI on April 13, 2014
1 answer 2 comments
ANSWER by on April 13, 2014
The anti theft is part of the programming in the computer; There is something, probably due to weather conditions, causing the alarm to go off. A door ajar sensor could be faulty and showing open when it's not open. The only way to be sure is to unhook the battery until some diagnostics can be done. I have seen some under hood fuse boxes fail causing circuit issues, but without testing and duplicating the symptoms it would be hard to say what the cause is.
COMMENT by on April 13, 2014
Thank you. I have received a faulty "door ajar" message periodically.
COMMENT by on April 13, 2014
That could be the issue.