Vehicle: 2004 Mercedes Benz S 430 (220.170), V8-4.3L (113.941), Automatic Transmission
Mileage: 199,776
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 called Tech-Assist.
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.
The technician inspected fuse #78 and found that it was cracked.
Confirmed Repair: He replaced the fuse and that repaired the problem.
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