Q: Where are my check engine, abs, brake, and airbag light on? on 2001 Dodge Durango

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I changed my battery and when I hooked up the new one my check engine, brake, abs, and airbag lights came on. Also, my speedometer stop working as well as the rear windshield wiper, heated seat and the heat and a/c controls. I was told that the pcm is fried and the there is more than one computer. What do I have to do in order to fix all of this? Can it be something other than the pcm?
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