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Your problem is your BCM or known as body control module is looping into theft mode and in return not getting power to the starter so I'd check with ford on a BCM flash to factory default settings hope this helps you
did it start before you changed the battery?when you say the alarm goes off do you mean the factory alarm or did you have it installed aftermarket? is there a theft or security light flashing inside?let me know maybe i can help
Sounds like your battery has a dead cell. The cranking amps required to start a vehicle is considerably more than to power accessories. The alarm may have a safety feature that will make it go off if the battery voltage is too low (or if someone disconnects your battery). Have your battery tested (with and without a load) and repost if this isn't the problem.
the jetta has a faulty alarm system from the factory i have been working on one in my shop. the alarm moddule is inside the dash behind the light switch and has a 10 pin connector and a 6 pin connector. this can be bypassed if you disconnect both connectors and jump the two large wire on the 6 pin connectors, these wires operate your starter. the car will start and run but your alarm will no longer be active. the door locks and everthing else will still work. the only issue i am having is the factory radio isn't working because it is controlled by the alarm. but worse case scenario i can use an aftermarket radio if need be.
you need to check battery supply most important. if the battery low voltage, cause no start. if the battery ok & strong energy. maybe the drive away protection control if this is the problem you need to bring to BMW dealer to replace control & ENCODE the control unit using SSS.