- January 22, 2015
- By helocksmiths
- In ECU, Module Programming
- 1238
- 0
The EIS switch module is fitted to most modern Mercedes-Benz vehicles and is the name given to the Mercedes electronic ignition switch. When repairing our first EIS immobilizer key module fault, never did we think we would encounter so many Faulty Mercedes EIS ESL. We are seeing units sent in from all over the world