Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
Hi,If fuses are all OK and there are no unusual wiring issues etc, I would be most expecting a problem with the front ecu. The front ecu is the box that plugs into the top of the fuse panel in the engine bay. It controls all of your lighting and wipers.It does not control the cruise control, however the cruise control does rely on monitoring the tail lamp resistance, so there is still the possibility of it causing an issue that way... otherwise I would expect the cruise is a different unrelated issue as it doesn't otherwise share any components with the lighting at all beyond monitoring tail light operation (to detect braking).
Very possibly related. Usually when you get the lights and blower staying on it means the AC clutch has shorted out. It is somewhat common on this era of Mitsubishi and water entry would definitely make that happen. It is not strange to think that if water got in there it may have gotten into the front ecu as well.With regard to the cruise not even turning on.... double check fuses, if they are OK that usually means a switch failure.
The 4WD would be likely unrelated to any of this. The center diff light is like a engine management light for the 4WD transfer ecu; it flashes to indicate something is out of sorts electronically in the 4WD operation. Most common is a bad free wheel solenoid on the front frame rail (or its hoses messed up causing it to operate wrong), however you would want to get the code scanned while the light is flashing to really see whats up there.
Nothing that encompasses all of your issues really... unless you had a loose connection in the column somewhere maybe. The central locking is fully integrated into the ETACS which is partially involved in the wipers and running lights and is involved in the turn signals.
With the front ecu ruled out we would be suspecting either the light switch, ETACS or wiring to be at fault for the remaining issues.... an given that the ETACS was not properly seated and that resolved some of the issues, I would be most expecting that the ETACS became damaged.If you still have the like vehicle, I would try swapping the ETACS. It is located under the driver side dash, it is the large smooth plastic box.