The ignition switch on your Mercedes is coded to the vehicle, so you will have to reprogram the system for the computer to recognize it. The switch itself is easy to remove but you must first remove the steering wheel, steering column tube module and the trim around the gauge cluster. The mercedes c300 may experience electrical malfunctions, such as issues with the power windows, central locking system, or radio. Additionally, some owners have reported transmission problems, such as rough shifting or slipping gears. These problems can be frustrating and costly to repair. Credit: www.benzinsider.com. The driver releases his seat belt or opens the driver's door. Automatic starting takes place in order to prompt the driver to actively switch off the engine by turning the ignition key to position 0, prior to leaving the vehicle. This ensures that the ECO start/stop system is safely deactivated when the vehicle is parked. The fuse is in the passenger compartment fuse box. You need to search on the old posts for the location details. 2.-. The other is a connector in the driver's side rear wheel well, where if you diconnect the harness with the ignition off, and you wait a couple of seconds, then the fuel gauge mechanism will be reset. Mercedes EIS Service Reasons for Ignition Lock and Tumbler Failure. The most prevalent reason the ignition lock and/or tumbler will begin to fail in your Mercedes is due to daily use causing wear and tear. There is a possibility that debris could be obstructing the key from turning properly, but it is much less common than the tumbler simply beginning to be worn Failure Date: 07/23/2016. Electronic ignition switch (eis) has failed twice! in 6 weeks and now the electronic steering lock must also be replaced. There is a concern that the esl may malfunction and lock steering while driving. This issue appears to be wide spread in 2008 and 2009 mercedes C300 vehicles. After sitting for 20 or 30 minutes the car would start right up and run good. This symptom is common with electronic modules and ignition coils where something inside shorts out after the unit heats up either from being on or from heat absorbed from the engine. After a while my car failed to start even with the engine cold (no spark), then out 7pj8T.