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I own a 2004 LS. You didn't get water into the PCM,because of rain or anything else. The PCM is behind the glove box,only the connectors are in the engine compartment and their under the housing for the cabin filter. They won't even get wet from rain.
The battery could fail any time,after say three years,for any reason.
Don't know about warranty,ordered mine from factory in 03.
I don't know if this is the same, but I used to have a 87 Chrysler LeBaron. It ran great until you washed it or it started raining. Then it would die and it wouldn't start until 2 or 3 days later after it dried out. I took it to the shop several times, they always said it was the fuel pump. It turned out to be the wiring that runs next to the battery, had the insulation eaten away from battery acid over the years. I wrapped the wiring next to the battery in a piece of plastic and I never had another problem with it. Sounds cheesy I know, but it was ironic that several shops looked at it and couldn't figure it out. As far as white smoke that might be a differant problem.
it sounds like the computer is getting wet; on a clear dry day, wash the car and check for any leaks up around the windshield before drying it off especially if the water coming in on the passenger side behind the glove box because that is where your computer is located