Alright, I got it.
U used the 7 doigit code you included -- 4 378 793 -- in the realoem parts search engine. The resposnse was:
"The specified part 61354378793 was not found." which now gave me the 11 digit part number for your EWS module (I deduced that from your post, and the fact that the EWS module has been known to cause problems related to what you seem to be hunting down).
Then I went to Pelican Parts and searched for 61354378793. This part has been discontinued and replaced several times, but I am happy to tell you that what you need is:
EWS CODED C/U PART NUMBER 61358380369
You can special order the part from Pelican parts, or perhaps from your dealership. You can also very likely find a used one on the Internet somewhere.
Please take a minute to explain to deatil what is going on with your car. So far you have only asked where to find stuff and what stuff is, but if we know the big picture, we can be of more help.