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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3567
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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FOB is not working doors not opening & even with the manual

Customer Question

FOB is not working doors not opening & even with the manual key is not working
JA: Have you checked the fob's battery?
Customer: it's still flashing red & even used teh spare key
JA: What is the model/year of your Mercedes?
Customer: FOB is flashing red
JA: What year is your Mercedes?
Customer: ml 350 4matic
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: 2007
JA: Anything else you think the mechanic should know?
Customer: the latcha the back was not opening for a while, was taking time to replace actuator
Submitted: 12 months ago.
Category: Mercedes
Expert:  Hipo64 replied 12 months ago.

Hi and Welcome to Just Answer! My name is ***** ***** I will assist you with your question!

Do you have access to vehicle at moment? is vehicle Battery charged?

Customer: replied 12 months ago.
Infinitives event access at all
Customer: replied 12 months ago.
I mean don't have any access
Customer: replied 12 months ago.
I am not sure with battery
Expert:  Hipo64 replied 12 months ago.

Ok, Lust need to understand the situation. Car is locked and no access. if this is the case then most likely your car battery is dead and that is why key FOB not working? are you at home or on the road?

Customer: replied 12 months ago.
I'm presently at home
Expert:  Hipo64 replied 12 months ago.

Not sure what equipment you have, but the only way to boost the car is:- vehicle has to be jacked up on safety stands, then remove plastic covers underneath the engine. then if you look up on passenger side you will see alternator and a large cable attached to alternator is point where car can be booster with battery charger or additional battery. once power source is connected key should work.

I assume all was working fine at time when vehicle was parked

Customer: replied 12 months ago.
everything was working then
Expert:  Hipo64 replied 12 months ago.

ok, so once you power up the battery all will work and you can unlock the car

Expert:  Hipo64 replied 12 months ago.

next is to check battery and charge it check how old is the buttery. production month and year stamped on top of battery terminal. like 03/07 means march 2007

Expert:  Hipo64 replied 12 months ago.

if battery is more than 8 years old, then replace it and have vehicle inspected for parasitic battery drain

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