Sounds like a short in the wiring going into any one of the computers connected to a
crimp connector Z51/5.

At dealer I would go to that connector and install in-line fuse holders to each of the consumers connected to that connector & then see what is causing the problem.

__________________
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