When the key is on, do you have power (12V) at fuse #26 in the front fuse box?
That allows the power seat relay to power up the seat fuses.

Possibly the seat relay is bad. Both the power seat relay & the power window relays are in the trunk. Next to each other.

__________________
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