Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi Pat, my name is***** first thing we always want to try is a second key. If you don't have a known good spare key you will probably need to order one from the Mercedes dealer before going any further. One thing you can try is putting a small heater inside the car to heat up the entire interior. If the steering lock or EIS is malfunctioning the heater may help get it working. The battery in the key does not affect the starting it is only used for the remote locking.
Let me know if you have any questions.