Vehicle: 2004 Mercedes Benz S 430
(220.170), V8-4.3L (113.941), Automatic Transmission
Problem: The vehicle was towed in because
the key would not turn on the Electronic Ignition Switch (EIS).
Details: The technician attempted to
communicate with the EIS, it was not possible. At that point, he
The Tech-Assist consultant studied the wiring diagram and found a
possible problem. In the Power Distribution diagram, fuse #78 in
the Cockpit Fuse Box powers the EIS itself (see the wiring
The technician inspected fuse #78 and found that it was cracked.
Confirmed Repair: He replaced the fuse and
that repaired the problem.