Check for blocked bulkhead / scuttle water drains . If blocked water can enter and play havoc with any electrics like fuse boxes or modules . Never done them on that vehicle but this is from another forum on the matter if you want to check .
Mitsubishi L200 leaks under dashboard
" Ok take off the windshield wiper arms, then remove the plastic piece under the wipers below the windshield, there is a tray under there and some drain holes, you may have to remove some more plastic pieces once you remove the one below the windshield (some models are slightly different) clear out all the tree leaves and pine needles and such from the tray there are drain holes in the enter, and on each end push a long flexible rod down carefully or compressed air really works the best this is you problem it needs to be done every few years or more often if you park under trees. "