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Kevin, Master tech
Category: Mercedes
Satisfied Customers: 2171
Experience:  Diagnostic technician
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I have a 2012 ML 350 the keys wont lock the car or open the

Customer Question

I have a 2012 ML 350 the keys wont lock the car or open the hatch. I tried changing the batteries and it still will not work
JA: Have you changed a battery before?
Customer: no its both keys
JA: What is the model of your '12 Mercedes?
Customer: ml 350
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: yes, so far i only changed the battery
JA: Anything else you want the mechanic to know before I connect you?
Customer: yes I hand some mechanic work about a month ago, tires, oil change route stuff, could they have turned something off?
Submitted: 12 months ago.
Category: Mercedes
Expert:  Kevin replied 12 months ago.

Hi im kevin can you lock doors from button on drivers door ? Do you have a spare key ?

Customer: replied 12 months ago.
Hi Kevin, Yes the locks work manually. However the key wont lock or unlock the car nor will it open the hatch. It is both keys
Customer: replied 12 months ago.
Expert:  Kevin replied 12 months ago.

Ok its likely the antenna for the key pickup has fauled if both keys arent working .the only way to confirm this is with a mercedes scan tool

Customer: replied 12 months ago.
OK do I have to go to a dealer for this?
Expert:  Kevin replied 12 months ago.

Most likely or a mercedes specialist as they will be the only people that can repair this is antenna is the cause