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How to Fix a Key Fob That isn't Working
If your key fob isn't working There are a few simple steps that can be taken to fix it. The first step is to make sure that it's not your backup remote.
If the backup can lock and unlock your car doors, it is most likely an issue with the primary remote. The majority of car remote key malfunctions result from circuitry or battery problems.
Battery
It is not unusual for the battery inside a car key fob to get worn out. It is simple to replace the battery. However, it is important that you choose the right type. You can refer to the owner's manual or contact the manufacturer to find out the correct type. It is also essential to examine the battery compartment, as dead batteries can leak caustic chemicals that can harm the remote. If changing how to repair car key fob doesn't fix the problem there may be additional issues that require professional attention. If the buttons are damaged or stuck, for example it might be necessary to take the remote apart and rework each component. You can also try reprogramming the vehicle to recognize the new remote.
Buttons
Through repeated use, key fobs could wear out and become dirty. This is not atypical however, it can cause buttons to cease working or require a very difficult press to get them to work. This can be a huge hassle particularly if you're out of town and need to start your vehicle. Even broken or damaged buttons can be fixed with a little time and tools you already have at home.
First, check that the batteries are properly charged and that the indentation on the back of the button is filled. Open the remote carefully and inspect the circuit board. Examine for indications of rust or other indications that the buttons are worn or damaged. For example the paint that conducts electricity could be missing. Use a Q-tip dipped into rubbing alcohol to gently clean any membrane contact that has become worn-out or where conductive painting is missing. Don't rub too hard, as this could erode the conductive paint, and block the button from firing when you press it.
Examine the battery connector's terminals for loose solder connections. If this is the case, simply reconnecting them may restore function to the button. The same method can be used to restore function to any other loose connections within the fob.
In the end, if any of the buttons made of rubber that are on the front of the key fob stop working or require a difficult press to function it is likely that the graphite disks that are on the back of the button are deteriorating and require replacement. You can usually do this by rubbing a pencil over the disks. This should bring the button to life.
If none of this is useful or if the button still doesn't respond to a firm press It could be the case that the circuit board itself has become damaged. This can sometimes be repaired by a quick clean, and re-soldering, but it is best to have an extra fob on hand in the event that this method doesn't work for you.
Circuitry
Whether or not the key fob buttons are working the circuit board in your remote might be dirty. This issue can be fixed by a thorough inspection. The most frequent causes of dirty circuit boards are water and broken cases. A damaged case can let water and other debris into the circuit board, causing it to short out. Water can also get through pins and vias, which are tiny connectors that are found on the board.
If you're able to open your key fob and don't mind some mess, we can de-solder the buttons and solder new ones in their place. It's also worth looking at the battery terminal connections. If they are loose, the buttons could not work or even become stuck in their down position. Soldering terminals and buttons back to their original positions is often enough to bring a non-working fob to a working 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 damaged by a hole that is that is drilled into them or over by a lawnmowers or door handle for a car. The failure of the fuse is usually the cause of non-remote chip failures.
If you're not comfortable opening the key fob, you may remove the circuitboard and utilize a multimeter to determine if the diode is functioning properly. If you're not comfortable with this, visit your local Oreilly or hardware store and utilize their RF frequency tester. This will inform you whether the key fob is sending an RF signal.
Programming
Key fobs aren't indestructible and are susceptible to being damaged through a variety of causes. They may lose their connection to the car's receiver due to shock or low battery, which requires the reprogramming. A professional auto locksmith or main dealer, can reprogram your keyfob to get it up and running again. If resetting or repairing your keyfob does not work it may be necessary to replace it.