Thanks, that's really helpful. I will run out there in a few minutes and try what you have suggested. In doing a search, I did read about the module located behind the headlight. I looked back there, but there is only bare sheetmetal between the R/D and the headlight. Also, in looking at the eBay part, it says it's only for 99 to 02 cars (this is a 97) so it's possible I don't have one.

Where exactly is the newer module located in the fuse box?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280