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How to Fix a Key Fob That isn't Working

If your key fob doesn't work, you can fix it by following some simple steps. First, make sure that it's not your backup remote.

If your backup remote cannot unlock and lock the doors of your vehicle, it is likely that the primary remote isn't functioning. Most problems with car remote keys are caused by circuitry or battery problems.

Battery

It is not uncommon for the battery inside the car key fob to get worn out. It is easy to replace batteries. However it is crucial that you choose the right kind. You can consult your owner's manual or call the manufacturer to determine the right type. It's also a good idea to examine the battery compartment carefully, as dead batteries sometimes leak caustic chemicals that can harm the remote. If changing the battery doesn't fix the problem there may be additional issues that require professional attention. For example, if buttons seem stuck or damaged, it may be necessary to disassemble the remote and rework its components. You can also try reprogramming the vehicle to recognize the new device.

Buttons

Due to frequent use, key fobs can get dirty and worn. It is not uncommon for buttons to cease working, or to require a hard press to make them work. This can be a hassle particularly when you're away from your home and have to turn on your car. Even malfunctioning or worn-out buttons are often fixable with a bit of time and tools you already have at home.

First, make sure that the batteries are properly installed and that the indentation on the back of the button has been filled. Take the remote apart and look over the circuit board. Examine for signs of rust or other signs that the buttons are worn out or damaged, like missing the conductive paint. Use a Q-tip, dipped in rubbing alcohol to gently clean any membrane contact that has become worn out or has conductive paint missing. Do not rub too vigorously as this can damage the conductive paint and stop the button from firing when pressed.

Check the battery connector terminals for loose solder connections. Soldering them back in place will allow the button to function again if this is the case. You can apply the same process to restore functionality to any other loose connection in the fob.

Finally, if any of the rubber buttons on the front of the key fob stop working or require a very difficult press to function it is likely that the graphite disks that are on the back of the button are deteriorating and need to be replaced. It is usually done by rubbing a pencil over the disks. car key repair near me should bring the button to life.

If none of this is useful or if the button doesn't respond to a hard press, then it may be the case that the circuit board has gone bad. It is possible to fix this with a quick clean and re-soldering, but it is ideal to have a spare fob available in the event this method does not work for you.

Circuitry

Whether or not the key fob buttons are working the circuit board in your remote may be dirty. The issue can be solved by a thorough inspection. The most common causes for dirty circuit boards are water and broken cases. A damaged case could allow water and other debris into the circuit board, which can cause it to short out. Water can also damage pins and vias, which are small connectors that are found on the board.

If you are handy enough to open your key fob, and don't mind making an mess, you can remove the buttons from their sockets and put in new ones. It's also worth examining the battery terminal connections. They can become extremely dirty and if they're loose, the buttons might not work or may even remain in their down position. Soldering the terminals and button's back into place is typically all it takes to restore the key fob that is not working to working condition.

Non-Remote Transponder Chips

Sealed non-remote transponder chips are more durable than remote fobs that have them but they can be damaged by a hole that is made in them or pushed over by a lawnmower or door handle for a car. The majority of non-remote transponder chips fail, and this can be blamed on a blown fuse.

If you're not confident opening the key fob, remove the circuitboard and utilize a multimeter to determine if the diode is operating properly. If you're unsure about doing this, head to your local hardware store or Oreilly's and they'll usually have a radio frequency tester that can tell you whether the key fob sending signals.

Programming

Key fobs endure lots of abuse and aren't completely indestructible. They may lose their connection with the receiver in your vehicle due to shocks or low-battery, which requires reprogramming. A professional auto locksmith or main dealer will be able to reprogram your key fob to get it functioning again. If resetting or repairing the keyfob is not working it may be necessary to replace it.