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. the smart key wont turn in the ignition at all, or lock/unlock the doors. Be careful not to use a higher rating as this can cause electrical problems.). If your car door lock won’t turn, remove the key and check for damage or debris. He also ghostwrites articles for numerous major trade publications. Next, try taking the emergency metal key out of the fob and using it to manually unlock the carâs doors. Because your MB receives the lock / unlock signal via the antennas installed on your car, a bad antenna module fuse can also cause Mercedes key fob to stop working. Quickly remove it within 10 seconds and hold down the Lock button. #KeysLockedInCar #SuperDavesHowTo Learn Locksmith Secrets: http://bit.ly/2UfwcQ3 Locked keys in car help. In the case that your vehicle uses is method of reprogramming, you will typically hear a chime after you have cycled the key several times. Does Having a Key Fob Mean You Have a Security System? These vehicles still usually have a physical key for locking and unlocking the doors, but it may be hidden. While holding the Lock button, press Unlock five times. If the car's battery is dead, you will often notice that the key won’t turn. Car was in garage all night. Joined: Dec 26, 2011 ... and use that fob when surfing. This process generally takes less than a minute to complete. Most of these batteries should show about 3 to 3.6 volts. Get the Latest Tech News Delivered Every Day, Broken Internal Contacts in Car Key Remotes, How to Fix It When Apple CarPlay is Not Working, What to Do When the Gauges in Your Car Aren't Working, How to Fix a Car Radio That Won't Turn Off. If the remote still doesn’t work, then there could be another problem with the remote, like broken battery contacts or a problem with the buttons. the alarm going off was due to new voltage. Even if that doesn't fix the problem, you'll have a safe, fresh battery once you do get your locks working again. Fortunately, changing the key battery is simple and can be accomplished by using the valet key that comes included with the fob. I was only able to unlock the car by climbing through the boot (not easy for a 6ft 3 male!) Replacing or Repairing Your Key Fob. Using WD40, spray into the door lock and onto the blade of the key. You should see a red LED light, and this should appear whenever the Lock, Unlock, Panic, or Trunk button is pressed. If your keyless entry remote and your car are no longer on speaking terms, you will have to reprogram your car’s keyless entry system to regain your car key remote functionality. On a car that is functioning normally, using the key in the rear lock will unlock the doors, although I have never tried it so I don't know if it disengages the immobilizer (can somebody test this? The key fob will often have a hidden key inside, so if you don't have a physical key for your vehicle, then check the fob for a release button or switch. 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In that case, you will want to look for a trim piece with a small slot in it, which you will have to pry away to access the keyhole. I replaced the key fob battery and the car battery have more then 12v reading. If you don't have a spare remote, you may be able to buy a used one or get one from your local dealership. In order for a car key remote to work in a secure manner, it has to be effectively paired with the receiver unit in your car. Then check the fuses for the central locking circuit (controls the vacuum operated door locking mechanism, which uses pressure to lock all the doors at the same time), antenna module, and AAM. How to fix a car key button that won't lock and unlock the door. Here's another one you can try if the first didn't work: Get in your car and lock the door manually. !, we phoned a service centre ( in the uk , as we live in France) they say that the car has lost the key code. Here are some common reasons for this issue: 2. Can't open rear hatch while Smart is running and key in ignition. Specifically, this article addresses issues with unlocking the Mercedes Benz CLK, E C CLS, A160, C-Class C220, C230, C300, CLS, and ML models. Then you will need to reprogram the key fob to the vehicle by putting it to the ignition switch and pressing the lock and unlock buttons for about 5 seconds. Turn the key left and right alternately without using excessive force, until the lock opens. In that case, you’ll probably have to take your car to a professional. 3. The other option is to just buy a replacement remote, which you can obtain either new from your local dealer or used. You can rule part of this out by locking and unlocking all of the doors via the physical primary control inside the vehicle, which would indicate that the electronics are fine. So where do you begin to figure out the cause of your specific problem? Jeff Buckley shows how many vehicles have the Door lock built into the door latch. If the AAM is defective, you will usually need to have it reprogrammed by your Mercedes Benz dealer, or buy a new one. If you are able to lock and unlock the doors with the physical key, then the locks are probably fine mechanically. This is often accomplished by turning the key in the ignition several times with the doors shut. Car key remote fobs are a nice convenience to have, but they all stop working eventually. When you press the button on your key, look at it carefully to see what happens. (These higher end models probably arenât necessary for diagnosing AAM issues, but if you enjoy working on your car they can be a great investment.) Your Mercedes key fob doesn’t work after changing the battery. If your car key remote works after replacing the battery, then you’re done. It may say in your manual, or you can contact a local dealer. If they are, then carefully soldering them back in place may return your broken key fob to useful service. Even if it's just a dead battery, you can pretty much guarantee that your car doors will fail to unlock with the remote at one time or another. Tried other key, no difference Yesterday the car did not misbehave. What Causes a Car's Electrical System to Suddenly Stop Working? Right after when I turn off the car, the key fob will work for less then 30 seconds. Depending on the type of Mercedes Benz you have, the fuse will be located in one of the fuse boxes in the engine bay, on the side of the dashboard, under the backseat, or in the trunk. However, there could still be an electrical problem. If your vehicle uses this method, you will notice the exterior and interior lights flash. If the battery is more than five years old, consider just replacing it. There are other methods, and some require special equipment. my wifes smart fortwo will not unlock the imobiliser, we thought at first it needed new battery in fob but this made no change, the key symbol is still in the gear change window on the dash, and no audible tones at all ! If the lock and unlock buttons work, then the other key might just need a new battery. Your Mercedes key fob has stopped working with no warning or explanation. So if you have a second remote, and you haven’t already done so, you’ll want to check whether or not it works. In that case, you may have to contact your local dealer or an independent shop that has experience with your particular make and model of vehicle. It's possible for an old battery to show a nominal voltage on a volt meter and still be unable to function under a load. If your vehicle uses this method, you will notice the exterior and interior lights flash. If the smart fob does not have any physical damage, the easiest solution to fix this issue is to... Change Broken Internal Contacts. You can check behind and under the dashboard for loose wires, but don't connect or plug anything in if you aren't able to verify that it's actually the wireless door lock receiver. If playback doesn't begin shortly, try restarting your device. You will have to purchase this (Foxwell, iCarsoft, and Bluedriver models are all recommended for Mercedes Benz), or you can ask a mechanic if youâre not comfortable doing this yourself. Did the key in and our pressed lock and unlock five times -WORKED IMMEDIATELY. Your problem is likely that the fob can start the car but will not allow you to unlock the vehicleâs doors or trunk. If the procedure is successful, the hazard lights will flash. Broken Key Extraction. In that case, try removing the buttons, cleaning them, flexing them in and out, and then reassembling the remote. Turned key to "start", nothing happened (no cranking, no sound, no clicks, no smoke)! According to the manual, the boot lock should unlock all of the doors, If the key fob is not working it will need to be re-programmed to the car using diagnostic equipment. If the car doors won’t lock or unlock using your smart key, but the lights flash or you can set the alarm off with the panic button, the problem is most likely with the central locking mechanisms on your car than your key … #16 usbseawolf2000, Mar 16, 2012. h00ktern Member. The number of times will vary depending on your made and model of vehicle. Locked out of your car in Naples FL and need help contact us at (239) 849-4979, My key wouldnât engage with ignition – couldnât start. Hereâs how to synchronize the key yourself: 2. DO NOT insert key into ignition while jump starting or even charging the battery. A good first step is to change the keyless remote battery. Reason 2 of 3: Issues with the key itself 3. A key fob casing is mostly plastic, and it gets exposed to lots of abuse. Different vehicles use different procedures. it does not have a smart key and the key remote is not working but am able to unlock and lock the car manually using the key. Insert your key into the ignition, and turn it to the accessory position. Yes, the FOB red light illuminates whenever I push the buttons 3. On smart key systems like these, the driver needs only to walk up to the car and the doors unlock automatically. Insert your key into the ignition and pull it back out six times within a maximum of just 10 seconds. If the key is unable to unlock the front doors, you will need to climb through to either charge the battery if that is the cause or plug in the diagnostic system to program the central locking then unlock using the fob. You can also just open up the remote and look at the battery, which will typically have a number printed or stamped into its surface. Follow the manualâs code reading procedure to interpret these, or look them up online. The interior locks works perfectly for both locking and unlocking. 2. If none of these approaches have worked for you, itâs possible that your key needs some extra work to synchronize to your car. The problem is with the key Fob. The most common problem with these car key fobs is that the batteries just go dead over time, in which case replacing the battery should fix the problem. Release these buttons and press the Trunk button once. Car key remotes typically use CR2025 or CR2032 batteries, although CR1620, CR1632, and others are also used in some applications. Check the life of your battery to verify this. you can push unlock/lock on remote or then insert into ignition to quiet alarm. I took the battery out and charged it indoors, subsequently the car cannot be locked. It’s also possible that your vehicle may have forgotten your fob, in which case you will need to reprogram it. Turned key back to "on", got blinking "key" indicator 5. Your local dealership may also have a universal remote they can use to check if your remote lock mechanism works. If the key fob appears to be working, see if the remote is transmitting a signal. Jeremy Laukkonen is tech writer and the creator of a popular blog and video game startup. Regarding your questions: 1. If the engine cranks or starts, you've turned the key too far. Use the metal key to lock and unlock your car, and you keep the fob inside your car. Depending on the MB class, this fuse can be found in one of the fuse boxes located in the engine bay, side of dashboard, under rear seat or trunk. Naples, FL. Again, if you donât see this light, your key fob is defective. replaced car battery. You'll be able to start your car by holding the fob against the Start button. Bonita Springs, FL. Here's another one you can try if the first didn't work: Get in your car and lock the door manually. You've fixed the problem, and you can go back to using your key fob as normal. 1. The best way to check this out on your own is to just pull the remote apart again and do a thorough visual inspection. Start the car and you should see some codes display on the scanner. Your Mercedes key fob has stopped working with no warning or explanation. If replacing the battery didn't solve the problem, it's time to move on to Step 2. Open the fob and replace the battery. While less likely, this is still something to keep in mind if after fixing your key or getting a new one your remote key still won't unlock car door. (Unfortunately, if you havenât resolved your carâs key fob issues by now, this step is a bit more involved and will cost some more money. I bought a 2nd hand 2003 City Cabrio Smart with only one working key. Most car key remotes use category 4 button cell batteries that aren’t expensive. The other issue you may run into is that some car doors don't have any visible place to insert a key. Car Safety Technology for Keeping Kids Safe, Verify that the remote is actually bad by using a. Here's the basic procedure for a common key fob programming sequence: Rather than start the vehicle, just turn the key to the run position and back to the locked position several times in a row. The panic button and/or trunk unlock features donât work. However, there may be times when the electronic key doesn’t communicate with the car. This article will explore some steps you can take to solve the problem of a Mercedes Benz key fob not working to unlock doors or a trunk. Christine Baker is a marketing consultant with experience working for a variety of clients. If you determine that the module is defective or programming is necessary, the scanner will not be able to help you unless it is a more advanced variety (such as Autel Maxidas or SnapOn Solus). If nothing else works, there is always a chance that the receiver inside your car is broken or disconnected. 4. The door latch is an electronic part controlled by a Body Module. Step outside of the car and test your key. This signal will be infrared, which you canât see with your eyes, but can detect using a cell phone. The All Activity Module (AAM) is not recognizing the key signal. Lights appear to all work 7. There are a few ways to determine the type of battery you need. locks due work inside car and smart key is showing battery still good for key. If changing the battery doesn't do anything to remedy the problem, there are some other steps you can take. If the backup remote is able to lock and unlock your doors, then you’ll know for sure that there’s actually some kind of problem with your main remote. Re-locked and un-locked car using key-remote, no change 6. You will be able to tell if it worked by pressing the Lock and Unlock buttons to see if they work. 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