Mercedes Benz Electronic Ignition Switch (EIS) Renew EIS module, make 2nd hand EIS to new one. The Mercedes (EIS) Electronic Ignition Switch. bad module, a failed Electronic Ignition Switch (EIS) also known as the EIS-EZS Electronic starter switch (EZS). This problem can affect various Mercedes-Benz models including E-Class, S-Class, C-Class, CLK-Class, ML-Class, SL-Class, etc. We can renew a 2nd hand EIS and transfer all the information from the Original in order for you to be able to replace the damage one on your car