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How to Fix a Key Fob That isn't Working
If your key fob isn't functioning There are a few simple steps that can fix it. The first step is to be sure it's not the backup remote.
If the backup can lock and unlock your car door, then there's a likely issue with the primary remote. The most common causes of key problems with your car remote are circuitry or battery issues.
Battery
The battery inside the key fob may be worn out over time. It is quite simple to replace a battery, although it is crucial to make sure that you use the right type; you can look in your owner's manual or contact the dealer for the manufacturer to find out what kind of battery you need. It is also important to check the battery compartment, as batteries that are not working properly can release caustic chemicals which can damage the remote. If changing the batteries doesn't solve the problem it could be that there are other issues that require attention from a professional. If the buttons are damaged or stuck, for example it could be necessary to remove the remote and rebuild each component. You can also try reprogramming your car to recognize the new key fob.
Buttons
Due to repeated use, key fobs could get dirty and worn. It is not unusual to have buttons stop functioning, or require a long press to make them work. This can be very frustrating particularly if you're away from home and need to start your vehicle. Fortunately, even worn-out or malfunctioning buttons can often be fixed with a little time and some of the materials you may already have around the home.
First, verify that the batteries are properly inserted and that the indentation at the back of the button is filled. Take the remote apart and look over the circuit board. Check for signs of corrosion or other indications that the buttons are worn or damaged, such as missing conductive paint. Use a Q-tip dipped in alcohol to gently clean any membrane contacts that have worn or have conductive paint missing. Be careful not to rub too hard, since this could cause damage to the conductive paint and stop the button from firing when it is pressed.
Examine the battery connector's terminals carefully for any loose solder connections. Soldering them back in place can restore the button's functionality if this is the situation. The same procedure can be used to restore functionality to any other loose connections in the fob.
If any of the rubber buttons at the front of the keyfob are not working or need to be pressed extremely hard the graphite disks on the back of the button may have worn out and will require replacement. You can do this by rubbing a pencil over the disks. This will bring the button back to life.
If none of these solutions work, or if you still cannot get the button to respond when pressed hard, it could be that the circuitry has failed. It is possible to fix this by a quick clean, and re-soldering, but it is best to have an extra fob available in the event this method fails for you.
Circuitry
If the key fob buttons function the circuit board that is inside the remote could be dirty. A very thorough inspection will usually resolve this issue. Broken cases and water are the most frequent causes of dirty boards. A broken case allows water and other debris to enter and short circuit the electronic components. Water can also get through pins and vias, which are the tiny connectors found on the board.
If electronic car key repair enough to open up your key fob and don't mind some mess, we can de-solder the buttons and put new ones in their place. Also, it's worth checking the connections between the battery terminals. If they're loose, the buttons could not work or even become stuck in their down position. Soldering the terminals back into place is usually enough to return a malfunctioning fob to a working condition.
Non-Remote Transponder Chips
The non-remote chips sealed in a sealed case are more durable than their remote fobs, however they are susceptible to breaking if a hole is drilled in them or when a door handle for a car or lawnmowers is pushed over them. Failures of the fuse are typically the cause of non-remote chip failures.
If central locking key repair to remove a key fob that is sealed and are willing to put up with the mess, you can take off the circuit board and examine the fuse using a multimeter for proper diode function. If you're not confident doing this, visit your local hardware store or the Oreilly's and they usually have a radio frequency tester that can let you know if the key fob is transmitting a signal.
Programming
Key fobs are subject to lots of abuse and aren't impervious to damage. They can break their connection with the receiver in your vehicle due to shocks or low battery, which calls for changing the program. A professional auto locksmith or a dealer in the main can reprogram your keyfob and get it working again. In the event that resetting and fixing your key fob doesn't work it may be time to replace it all over again.