If your security light is blinking.Turn key to on position(2 clicks) wait for 10 minutes security light should stop blinking.Turn key to off position. Turn key forward 2 clicks wait for 5 seconds and try to restart the car.
SOURCE: security light stays on car wont start...
Looks like the TDM in the security system (VATS/PassKey) is having problems, it's typical on those cars. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.
SOURCE: drove car, the next morning car dont turn over but
you may still need to try a boost from another car.it may still not have enough of a charge to turn starter. any clicking at all when you attempt to start? if this does'nt work,look under hood in black main fuse box,lift cover off box.under the cover you should see locations of certain fuses and relays. check for bad starter relay or fuse,also check for a main ecm fuse bad and a bad main engine fuse bad. the only other alternative is bad starter. don't know how mechanically inclined you are but if a starter going bad,sometimes you can get one last start out of a bad starter by tapping on it while someone holds key in start position. do not attempt if you're not mechanically inclined as there are very high voltage wires going to the starter that you don't want to accidently hit and short out! hope this helps and thank you for choosing fixya.com
SOURCE: Security light blinking
You can beat this yourself. This link explains why the problem exists, and how to fix it yourself.
http://vatspasslockpasskeysecurityhelp.yolasite.com/
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