Start by checking the K40 power supply relay in the COMPUTER box. There are between 4 & 6 fuses in the power supply relay.

It is located at the right rear of the engine compartment..you have to un-screw the cover..good luck.

__________________
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