When starting the 2004 Pacifica the evic system

Disconnect the Negative (Very important only the negative cable) battery cable for 5 minutes and see if the system resets.

check the headlights auto unit for a malfunction

first solve the key problem
than check if the gear box has enough oil

You have probably found that if you drive for a few miles it will reset itself. If not there is a battery inside each unit in the tire and they go out. You can get a complete unit at the parts store for about 24 dollars and take it to Walmart and they will install it for 10 dollars

you may have a bad switch which is located on the latch asm

on some of the vehicles, you turn the ignition key on, but do not start the engine, then press the accelerator to the floor 3 times within 10 seconds, do this pretty fast, then turn key off, then turn key back on again , but do not start, look and see if the maintenance / service light has went out.

disconnect the battery negative calbe for 3 minutes resets all modules

I found this online last year. It should be a recall item for Chrysler

On the left control arm (sticking out of the steering column, (turn signal lever)), there is a bulky switch. it should be on top +/-. As you turn it the lights will get brighter or dimmer depending on the direction you are turning. (Once it reaches the end of the rotation, the interior lights come on. Remember not to leave the interior lights on!). There is a similar swithc on the right lever that operates the rear window wiper.

If you don't have a users manual, you can download it and go to page 177, it explains it there.