Just a little heads up.
I recently had to repair a sprinter that would not start and was stuck in reverse.
It turned out to be a flooded control unit.
The silver can under the drivers seat.
Rather poor design in my opinion,
The box is unsealed and mounted upside down , and the board is not conformal coated.
The lid recess creates a small well, catching any un expected water ( note: do not randomly jet wash the inside of the vehicle !). Being unsealed the water soaks into the enclosure and stays there, until it overflows !
Recomended Prevention.
Remove control unit reinstall with label facing up.
Better still remove cover and board and confomal coat the board and refit as above.
Recomended Repair.
Remove all the mould and rusted board !
Trace out the busted tracks, repair, test, then refit as above.
I also noticed that one of the large inductors was fairly burnt, not sure if this is normal or perhaps a result of the excess percipitation, anyway it still worked but it was replaced while in bits so it look pretty again.
I hope this helps you out if you have just driven thru a lake or jetwashed the inside of your merc sprinter semi automatic workhorse.
Oh while you are there, clean out the rubber drain plugs in the wiring tunnel.(both sides)
Sorted,..
You gotta love technical design.
Happy days...
HiddenVision, May 2010