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Question edited to add some real sentences.
Question moved to model category.
Not sure what you mean you "got a key programmed already". The key and the vehicle need programming together at the same time using a professional grade scan tool computer.
You need to reset the immobilizer and security system. There are details here. Do you have a voltmeter? If the battery is below 11 volts, the security systems will fail. If the ideas here don't work, you need an auto electrician or an auto locksmith to diagnose and fix. Looking at the wires on the PCM won't help much. The PCM is the Powertrain Control Module, your antitheft and immobilizer is a joint effort between Body Control Module, Engine Control Module and Antitheft Security Module.
Check all the fuses, rippling out the wiring may have blown some. Was the battery disconnected. The security and immobilizer needs to be reset. In reality, you probably need and auto electrician that can bring up and read wiring diagrams. Their scan tool computer can also diagnose communication issues or damaged modules.
run scan for any trouble codes -----may be a key problem try your other key if persists possible immobilizer failure https://www.chryslerforum.com/forum/chrysler-pacifica-15/service-immobilizer-8748/
The anti theft system is working well for you. The key probably wasn't in the ignition when you connected the battery back up. Number one tip, always maintain power when changing batteries with a couple of pieces of wire.
it started for two seconds and shut off because the immobilizer is active. those fobs are notorious for having bad contacts to their batteries, if you look closely you will probably find that one of the contacts for the battery has come loose. unlock the car with the key itself and it will probably run because there is a switch on the driver's door lock which disables the immobilizer. your lights are flashing because your battery is dead or there is a poor connection to the battery somewhere. get a jump start.
OK, if the vehicle won't start and the service immobilizer light is on then I would definitely take it to the dealer in order to have the key programmed to the computer, again.
Did the battery go dead lately? Is there a code associated with it not starting, as in the immobilizer function lamp?
or the key is not programmed to the ecm?
P0633 Immobilizer Key Not Programmed ECM/PCM
This is just a possibility to look into.
There is a little black plug under the steering wheel near the center console. That little plug is the immobilizer I believe. If it is loose or missing, the car will not do anything, hopefully yours is laying in the floorboard somewhere!
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