I just compared the 123 and 124 wiper circuits, they appear to be arranged the same. Unfortunately the interval wiper relay is rolled into a common package with the turn signal flasher and rear defrost timer relay (device N10). Next time I am at the JY I will grab an N10 and a VW relay and see if the guts will swap over inside the N10 package.

Unfortunately no such luck in the 210, the wiper is run from the front SAM and the wiper switch in the stalk just puts different resistances on a control line to the SAM depending on the switch position. Although I may try to retrofit an IR rain sensor if I happen to come across a JY car that has it. The ML has the rain sensor and it is amazing.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech