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), Start by reading the AAM fault codes with a diagnostic car scanner. locks due work inside car and smart key is showing battery still good for key. Here are some common reasons for this issue: 2. A good first step is to change the keyless remote battery. 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. However, it’s still a good idea to verify the actual battery your remote uses and check to see whether or not it’s good. There are different levels of scanners from simple to complex. 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. When you press the button on your key, look at it carefully to see what happens. Why Your Car Won't Start Even Though the Lights Work, What to Do When Your Car Interior Lights Stop Working. The other option is to just buy a replacement remote, which you can obtain either new from your local dealer or used. Check the life of your battery to verify this. The door latch is an electronic part controlled by a Body Module. 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. !, we phoned a service centre ( in the uk , as we live in France) they say that the car has lost the key code. 3. It’s also possible that your vehicle may have forgotten your fob, in which case you will need to reprogram it. They may be soldered back in place as well if you find that they have come loose unless a button is physically snapped off. If your car key is stuck in the ignition as a result of a broken car key, then you need to assess the situation and determine whether or not you want to handle it yourself or call a professional locksmith. You should see a red LED light, and this should appear whenever the Lock, Unlock, Panic, or Trunk button is pressed. 3. (Usually, this synchronization happens as soon as the key goes into the ignition, but in some cases, you will need to program the fob to synchronize to your car.) If the procedure was successful, your key fob remote will work again. If you find a blown fuse replace it. If you don't have a spare remote, you may be able to buy a used one or get one from your local dealership. If your vehicle uses this method, you will notice the exterior and interior lights flash. Here's another one you can try if the first didn't work: Get in your car and lock the door manually. How to fix a car key button that won't lock and unlock the door. I took the battery out and charged it indoors, subsequently the car cannot be locked. Marco island, FL. Even if that doesn't fix the problem, you'll have a safe, fresh battery once you do get your locks working again. 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Naples, FL. This signal will be infrared, which you can’t see with your eyes, but can detect using a cell phone. The interior locks works perfectly for both locking and unlocking. Most car key remotes use category 4 button cell batteries that aren’t expensive. That means even if the remote unlck lock is somewhat defective it will start the car. Prying away a trim piece like this does carry some danger of damaging the paint on the car door or door handle, and you can also dent or bend the trim piece. The best way to check this out on your own is to just pull the remote apart again and do a thorough visual inspection. It may say in your manual, or you can contact a local dealer. 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. The other issue you may run into is that some car doors don't have any visible place to insert a key. If the key is not still functioning properly repeat steps 1 through 4 until the synchronization process is done correctly. If the lock and unlock buttons work, then the other key might just need a new battery. Car key remote fobs are a nice convenience to have, but they all stop working eventually. Her expertise includes social media, web development, and graphic design. Regarding your questions: 1. This isn't unusual in higher end vehicles, which frequently use more complex electronic ignition systems. Turn the key left and right alternately without using excessive force, until the lock opens. If playback doesn't begin shortly, try restarting your device. the alarm going off was due to new voltage. Turned key to "start", nothing happened (no cranking, no sound, no clicks, no smoke)! 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. Right after when I turn off the car, the key fob will work for less then 30 seconds. 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. It’s always frustrating when your Mercedes Benz key fob doesn’t work to open the car’s doors or trunk. Some owners report an error message, such as "key not detected," or limited range when the key batteries are dead or very low. Key fobs are exposed to more physical abuse than most electronics, and they aren’t indestructible. If your car door lock won’t turn, remove the key and check for damage or debris. Tried other key, no difference Yesterday the car did not misbehave. A key fob casing is mostly plastic, and it gets exposed to lots of abuse. Please my Car is a toyota highlander le 2015 model. So if you have a second remote, and you haven’t already done so, you’ll want to check whether or not it works. If your car key remote works after replacing the battery, then you’re done. However, there may be times when the electronic key doesn’t communicate with the car. I assume you have only one remote so you cant try the other, your dealer is overpriced they typically are about $250 or less Fortunately, changing the key battery is simple and can be accomplished by using the valet key that comes included with the fob. 3. )As we know, using the key in the ignition after the immobilizer is engaged (say from leaving the car sitting unlocked for 5 minutes) does not disengage it, you need to use the remote for that.The "unlocking and … If changing the battery doesn't do anything to remedy the problem, there are some other steps you can take. Your keyless remote or key fob won’t unlock doors. Broken Key Extraction. Your Mercedes key fob doesn’t work after changing the battery. No, I don't have a spare FOB I believe the FOB is not the problem since I can start the car without the auxiliary Key and I can open and close the trunk with the FOB button. However, there could still be an electrical problem. 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. Again, if you don’t see this light, your key fob is defective. The two most common points of failure are the battery terminal contacts and the buttons, although there are a lot of other ways they can break. 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. This prevents anyone with the same make and model from walking up and using their fob to unlock your car. 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. 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). Insert your key into the ignition and pull it back out six times within a maximum of just 10 seconds. So right after i turn of the engine I have to lock the car immediately otherwise it won’t lock via key fob. However, there could also be a mechanical or electrical problem with the door locks. 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. The key fob could have a battery that is going dead. If none of these approaches have worked for you, it’s possible that your key needs some extra work to synchronize to your car. There are other methods, and some require special equipment. If you are able to lock and unlock the doors with the physical key, then the locks are probably fine mechanically. 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. 3. 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. In other words, it will not allow you to use the fob as a keyless entry remote. Jeremy Laukkonen is tech writer and the creator of a popular blog and video game startup. On smart key systems like these, the driver needs only to walk up to the car and the doors unlock automatically. Use the metal key to lock and unlock your car, and you keep the fob inside your car. In that case, you'll typically need to obtain a new remote. There are a few ways to determine the type of battery you need. If the key fob appears to be working, see if the remote is transmitting a signal. Your problem is likely that the fob can start the car but will not allow you to unlock the vehicle’s doors or trunk. Follow the manual’s code reading procedure to interpret these, or look them up online. You've fixed the problem, and you can go back to using your key fob as normal. Different vehicles use different procedures. I was only able to unlock the car by climbing through the boot (not easy for a 6ft 3 male!) Bonita Springs, FL. (Unfortunately, if you haven’t resolved your car’s key fob issues by now, this step is a bit more involved and will cost some more money. If your key is still not working, consult a BMW mechanic or lock and unlock your car manually. If your backup remote doesn’t work either, it’s always possible that it is also bad. Using WD40, spray into the door lock and onto the blade of the key. 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. Hopefully, reading this article has left you better prepared to deal with this situation. Christine Baker is a marketing consultant with experience working for a variety of clients. So if you discovered in an earlier step that your vehicle uses a remote that can’t be easily reprogrammed at home, you’ll want to keep that in mind. If you don’t see this light, the problem is that your key fob is defective. Your local dealership may also have a universal remote they can use to check if your remote lock mechanism works. Open the fob and replace the battery. This is often accomplished by turning the key in the ignition several times with the doors shut. Top 5 Reasons to Consider Changing Your Locks, How to change proximity key / smart key batteries. Here’s how to synchronize the key yourself: 2. (These higher end models probably aren’t necessary for diagnosing AAM issues, but if you enjoy working on your car they can be a great investment.) Once you know what type of battery is in your remote, you can either check the voltage with a multimeter or just swap out a known good battery since they aren’t that expensive. replaced car battery. Re-locked and un-locked car using key-remote, no change 6. 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’ve already done this, keep reading.). Your Mercedes key fob has stopped working with no warning or explanation. Love our new to us Smart...but wondering if there is some way to open rear hatch without using the key remote. Here are the five things you'll want to check first when your remote stops locking or unlocking your car doors: This is extremely basic stuff, and it won’t apply to a lot of people, but the first step in figuring out what is wrong with a car key remote is to verify that the problem is actually the remote. Car was in garage all night. 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. 4. In that case, you’ll probably have to take your car to a professional. While holding the Lock button, press Unlock five times. Only turn it to the run position, not the start position. 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. You can then press one of the lock or unlock buttons on the remote, after which you should hear the chime a second time. 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. If the battery terminals don’t look broken, you may find an issue where the buttons are soldered and have come loose. 2. If you notice that one or more of the buttons look like they aren’t popping back out correctly, or they seem to have come apart inside, that can prevent a car key remote from working properly. Thank you for your help. Your keyless remote or key fob won’t unlock doors. The AAM is not receiving signal at all because of an antenna issue. You will have to purchase this (Foxwell, iCarsoft, and Bluedriver models are all recommended for Mercedes Benz), or you can ask a mechanic if you’re not comfortable doing this yourself. 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. 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