Originally Posted by 
Graeme
				 
			The transfer case module is not sealed, with the circuit board and connectors exposed to any sprayed water.  The transfer case module is also a link between 2 sections of the high speed canbus (in 1 side and out the other) so if its processor fails then the canbus will be interrupted, preventing communication between the modules on either side.
I suggest that the transfer case module be removed, then remove the circuit board from its enclosure, washed in clean water and allowed to dry before being refitted.  That was standard practice many years ago for mainframe computer circuit boards if subjected to water from a fire sprinkler system.