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How to Fix a Key Fob That isn't Working
If your key fob isn't working, a few easy steps can be taken to fix it. The first step is to make sure that it's not the backup remote.
If your backup remote is unable to lock and unlock the doors of your car, it is likely that the main remote isn't functioning. The most common causes for key malfunctions for car remotes are issues with the circuitry or battery.
Battery
It is not unusual to find a battery on a car key fob to wear out. It is fairly easy to replace batteries, but it is crucial to make sure that you choose the correct type; you can look in your owner's manual or contact the dealer of the manufacturer to determine the type of battery you need. repair car key fob is also essential to inspect the battery compartment, as batteries that are not working properly can release toxic chemicals that could damage the remote. If replacing the battery does not fix the problem there may be additional issues that require attention from a professional. For instance, if buttons seem stuck or damaged it could be necessary to take the remote apart and rework its parts. You can also try reprogramming the vehicle to recognize the new key fob.
Buttons
Key fobs can become filthy and worn out due to frequent use. This is not atypical however, it can cause buttons to stop working or require a very long press to function. This can be very frustrating especially when you're away from home and need to switch on your car. Even malfunctioning or worn-out buttons are often fixable with a little effort and materials you already have at home.
First, make sure that the batteries have been correctly inserted and that the indentation on the back of the button is filled. Then, carefully remove the remote and examine the circuit board. Examine for signs of rust or other indications that the buttons are worn out or damaged, such as missing paint that is conductive. Use the Q-tip, dipped in rubbing alcohol, gently clean any membrane contacts that are worn or where conductive paint is missing. Do not rub too vigorously in order to damage the conductive paint, and block the button from firing when it is pressed.
Also, make sure to inspect the battery connector's terminals to ensure an unattached solder connection. If this is the case, simply connecting them back may bring back function to the button. You can use the same process to restore functionality to any other loose connection inside the fob.
If any of the rubber buttons located at the front of the keyfob are not working or need to be pressed very hard, the graphite disks at the back of the button could have worn out and need to replaced. This can be done by rubbing a pencil on the disks. This should bring the button back to working.
If all of this doesn't help or if the button still doesn't respond to a firm press It could be the case that the circuit board itself is damaged. It is possible to fix the issue by cleaning and re-soldering the button, but you should have another spare in case it does not work.
Circuitry
Whether or not the key fob buttons function the circuit board in the remote could be dirty. A thorough examination is often enough to resolve this problem. The most common causes for dirty circuit boards are water and broken cases. A broken case allows water and other debris to enter and short circuit the electronic components. Water can also damage pins and vias, which are the tiny connectors found on the board.
If you're skilled enough to open your key fob and you don't mind making a mess, we can remove the buttons from their sockets and put in new ones. It's also worth checking the connections between battery terminals. If they are loose, the buttons might not function or get stuck in their down position. Soldering the terminals and buttons back in their place is generally all that's needed to return a non-working key fob to functioning condition.
Non-Remote transponder chips
Sealed non-remote transponder chips are more durable than the remote fobs they are contained in, but they can still be broken by a hole being that is drilled into them or over by a lawnmowers or car door handle. The failure of the fuse is usually to blame for non-remote chip failures.
If you're handy enough to open a sealed non-remote key fob and are able to bear the mess, you can remove the circuit board and examine the fuse using a multimeter for proper diode function. If you're unsure about doing this, go to your local hardware store or Oreilly's, and they'll usually have an radio frequency tester that can determine whether the key fob is transmitting a signal.
Programming
Key fobs take lots of abuse and aren't impervious to damage. They may lose their connection to the car's receiver due to shock or low battery, which requires them to be reprogrammed. A professional auto locksmith or dealer will be able to reprogram your key fob to get it back up and running. If resetting or repairing your keyfob does not work it is possible to replace it.