My Smart has a new issue: when I turn the wipers to interval the wipers do a half swipe and stop mid windshield rather than returning to rest position. On slow and fast the wipers wipe normally, but when I switch them off they stop right where they are at that moment, not back to the normal rest position. My car has always been garaged and I live in a pretty dry area.
I checked:
Wiper linkages: all intact and I lube them regularly
Wiper stems: get lubed regularly and move freely
Electrical contacts on motor: all clean, no sign of corrosion
Wiring: followed as far as I could, no issues seen
Wiper stalk: disassembled, checked for corroded contact, none seen. cleaned contacts anyway with 1000 grit sandpaper.
SAM unit: no sign of water ingress, all contacts clean, no bad solder joints or signs of overheating on the circuit boards.
I tried to find what determines where the wipers are supposed to stop, but have not found it yet. I have a feeling it is in the wiper motor itself, but since they are a pain to get out I thought I ask the expert here if there is anything else I overlooked.