The wiper speeds are built into the motor. sounds like the wiper switch isn't sending that signal to the motor.

The seat belt handler has a torque limiter in the mechanism..most likely bad.
To repair you must replace the completer handler.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator