2004 PACIFICA WONT START SERVICE IMMOBILIZER LIGHT ON VEHICLE WILL NOT DO ANYTHING

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.

https://www.google.com/search?q=2007+Chrysler+Pacifica+reset+security

https://www.google.com/search?q=mobile+auto+electrician+near+me

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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/

maybe a ground wire somewhere came disconnected either under the hood or under the car,also check your battery cable connections and fuses

Clean your battery post use a battery maintenance kit has a green
and red filter ring also have your battery tested in cold conditions if a battery is weak that's when it's more noticeable.thats why you see CCA on battery's they are tested cold to determine cold cranking amps.

Bad battery connection for the last, the previous could be related but check air and fuel filters anyhow.

have the keys reset to the immobiliser in the car.

lost key programming

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!

The Green key Flashing indicates an issue with the immobilizer of the vehicle. This could be a problem with the key being not programmed, or having lost its program. Or this could be an issue with the immobilzer unit, or the part of the ignition switch which reads the key. If the vehicle is cranking with the green light flashing, you will ultimately need the honda dealer computer to program either the key or immobilizer unit.

It is for an oil change mainly and any other service your maintenance manual suggests at the mileage interval. It needs to be reset after each oil change to be accurate.