AS I posted 2 years ago.....the most likely cause is NOT the window that isn't working! Most likely one of the rear door modules causing the front one(s) not to operate..

A good tech can do voltage checks at the CAN connector to find the culprit.

__________________
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