My 2006 E320 CDI is experiencing wiper failure, whereby they stop in low, high, & intermittent settings (as well as fail to start) after having run for 15 minutes. Whichever scenario, shutting off & restarting the engine always corrects the problem, but only for a few minutes before they fail again. I can't find a relay. Legend has it there isn't one. Anyone have experience/insight with such nonsense?

Very strange. Do you have access to Xentry? Might be good to see if there are any fault codes.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

seems like the front SAM is recieving a corrupted signal from the stalk.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)