Generally speaking, when Mercedes key fob is not working, it’s because either because the key is defective or the All Activity Module (AAM) is not recognizing the key signal, or it is not receiving signal due to an antenna issue. If you need a replacement battery note that Mercedes-Benz uses CR2025 battery type.
Also know, why won’t my Mercedes key unlock my car? Your Mercedes Benz receives the Lock or Unlock signal from antennas installed on the car, so a bad antenna module fuse can cause your key to be unable to unlock doors. … If you find a blown fuse, replace it (using the Ampere rating recommended by the manufacturer.
Also the question is, how do you reset a Mercedes key fob? You can reset the Mercedes-Benz key by placing the key in the ignition of your car when the engine is turned off. Don’t turn the engine on. Take the key out of the ignition when pressing down the “click” button. Using another finger to click the “unlock” button five times in a row.
Subsequently, how do you test a Mercedes key fob?
In this regard, how do you start a Mercedes with a dead key?Quickly remove key from ignition and within 10 seconds hold down the lock button. Continue holding the lock button, and at the same time press, the unlock button five times. Next release all buttons and press the gate/trunk button one time. Your Mercedes remote should be synchronized.
Can I program a Mercedes key?
The answer is: Yes. A used Mercedes-Benz key can be programmed, but it is not easy. … The answer you get from the dealer is: “A used Mercedes-Benz key can not be programmed once it is synchronized to a car.” In fact, a used Mercedes-Benz key can be programmed but not at a Mercedes-Benz dealership.
Do you have to reprogram a Mercedes key fob after changing the battery?
The key fob will need to be reprogrammed to the vehicle as when the battery was replaced in the key fob, the key was reset. This is why nothing is working with the key fob.
What causes key fob to stop working?
Bad Battery – The most common reason your key fob has stopped working is because of a dead battery. A simple swap with a fresh battery that you can find at most big box stores should do the trick to get things working again. … They can re-pair your key fob to your vehicle or help you replace your defective fob.
Can you start a Mercedes without the fob?
Insert your SmartKey® into the ignition. Then press the brake pedal, and make sure the transmission is in the Park position. Turn the key in the ignition to start the engine, making sure to release the key as soon as the engine turns over.
How do you unlock a Mercedes without the key?
Why will my Mercedes not start?
Battery. The most obvious reason is that the battery might already be too old. If you have a relatively new battery, though, but the engine won’t start, trickle charge your battery by using a 12-volt trickle charger. …
Can a locksmith make a key for a Mercedes?
A mobile locksmith is the best when it comes to both price and convenience. … For the most part, locksmiths should be able to help you replace or duplicate your Mercedes-Benz key at a better price than a dealership, in part because they should be up to date with the skills and equipment required.
Will a dead key fob cause car not to start?
Dead key fob A keyless entry system won’t start the engine unless it detects that your key fob is inside the car. If your key fob has a dead battery, the system likely won’t be able to recognize when the fob is inside the car and accordingly won’t start the engine.
Can I start my Mercedes with my phone?
Smartphone ready SmartKey Starter® is available with smartphone integration. Use an iPhone or Android smartphone to start your Mercedes-Benz, operate the door locks, or control a variety of aftermarket alarm systems remotely.
How long does it take to program a Mercedes key?
A: The process for a new Mercedes key or fob, can take up to two days to complete. That depends on how many keys are already programmed into the system. If you had one or two keys and they both lost, then the dealer should be able to program you a new key within an hour or two.