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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53945
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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C320: My smart key will not open door or lock doors to Mercedes,

Customer Question

My smart key will not open door or lock doors to Mercedes, also will not start car ignition will not turn light on smart key flashes when I press open and unlock button down what could be the issue also I can not open trunk of the car to remove battery
Submitted: 2 years ago.
Category: Mercedes
Customer: replied 2 years ago.
Also I can not figure out how to open the trunk to charge battery of the car
Customer: replied 2 years ago.
I replaced the key less than a year ago could it be the key again?
Expert:  Marty replied 2 years ago.
Hi, welcome to Just Answer. My name is***** this could be a faulty key but it is unlikely that your new key is bad already. If your car battery is weak it will also cause the problem. A faulty electronic ignition switch is also a possibility. The first thing you need to do is get the trunk open so you can check the battery. Remove the blade key from the key fob and insert it into the trunk lock cylinder then rotate the key counterclockwise to the 10 o'clock position and hold it in that position while pushing in on the trunk button. If the battery tests good the most likely problem is a faulty ignition switch.
Let me know if you need further assistance.
Expert:  Marty replied 2 years ago.
Hi, I'm just following up with you on the Mercedes. Was my answer helpful?