Check the harness plugs, make sure you did not knock one apart when you did the pressure washing. On my CRD, I knocked apart one of the AC harness connector plugs near the TCM and had no AC, pushed it back together after wasting hours of diagnostic time and the AC worked.
Check your fuses; the control modules like the BCM need power to operate, you might get lucky and the fix will be simple and stupid. Also check the relays that switch on the power, one bad relay can drive you nuts. There are basically two kinds of ISO relays used on the CRD, you may be able to swap them and find the bad one.
Water getting to relays can also cause problems. Water dripping out is a dead give away.
If you go to a Dealer, they have to go through the Diagnostic Flow Chart and test every thing that may be remotely related to keep the Chrysler Bean Counters Happy, even if they have a hunch it is a fuse, relay, or disconnected plug. You will pay a stiff price most of the time for them to go through the drill.
If you go to an Independent you are betting on his/her's past experience and luck in finding the problem. Some track the problem down and verify, others keep slapping on parts until it is fixed.
If you find a loose plug, bad fuse, or bad relay and the problem does not go away. Use the OBDII scanner after replacing the bad parts, to see if it brings part of the system out of a coma, this may let the OBDII scanner help you find the rest of the problem.
Good Luck and let us know what you find out.
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Although the connector is pretty well sealed it could be possible to get water in that area. I would suggest you disconnect the battery, unplug the ECM connectors and dry out the connectors with a hairdryer.
