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Check the ground G201 located under the plastic trim piece that runs along the carpet below the front passenger door, G201 is a connector with a bunch of ground wires plugged into it that bolts to the door frame, this plastic trim piece hides it from view, if you pull the trim off it is pretty obvious behind there. This provides a solid ground for the IPM and a number of other devices, IPM being the instrument panel module. Water intrusion past the door gaskets could cause it to corrode, if it looks bad then it probably is, try and clean it up, especially check those terminals inside the connector where the wires clip in. By the way, all of the grounding points throughout the car will look like this one, this is a typical ground post, the terminals that are used to crimp onto the wires and push into the connector are female metripack terminals and are sometimes available at a local parts store, I had to try a few different places, none of the major chains had them. Make sure there is no rot or corrosion on the bolt or lug that actually contacts the body of the car.
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