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We have had issues with water leaking onto the dash fuse box and the GEM module mounted on the back of the fuse box causing all kinds of electrical problems. You can remove the fuse box and GEM module and check for green corrosion in the bulk wire connectors for the fuse box. Also check for water staining on the fuse box and GEM module. The leak is from a body seam under the drivers side of the wiper cowl panel where the left front fender meets the body.
Sorry. Though it was a 2000.
The 2003 does have the fuse box behind the passenger side kick panel. Before replacing any parts, have all the modules checked for trouble codes. Including the instrument cluster.
The 2003 Expedition does not have a GEM module. The dash fuse box controls those functions now.