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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. First, ensure that it's not your backup remote. If your backup remote can unlock and lock the doors of your car, it is likely that the primary remote isn't working. Most car remote key failures result from battery or circuitry problems. Battery It is not uncommon for the battery in the key fob for cars to get worn out. It is simple to replace batteries. However, it is important to select the right kind. You can check the owner's manual or contact the manufacturer to determine the right type. It is also crucial to examine the battery compartment, as dead batteries can leak caustic chemicals which can damage the remote. If replacing the batteries doesn't solve the issue it could be because there are other issues that require attention from a professional. For example, if buttons seem stuck or damaged it could be necessary to disassemble the remote and rework its parts. You can also try reprogramming the vehicle to recognize the new fob. Buttons Through frequent use, key fobs could get dirty and worn. It is not uncommon for buttons to cease working, or to require a hefty press to make them work. This can be very frustrating especially if you're away from home and you need to start your car. Even worn-out or malfunctioning buttons are often fixable with a little time and materials you already have at home. First, check that the batteries have been correctly inserted and that the indentation on the back of the button is filled. Take the remote apart and examine the circuit board. Check for signs of rust or other signs the buttons are damaged or worn. For example there could be conductive paint missing. Use a Q-tip that has been dipped in rubbing alcohol to gently clean any membrane contact that has worn-out or where conductive painting is missing. Don't rub too hard, as this could erode the conductive paint and stop the button from firing when it is pressed. Check the battery connector terminals carefully for any loose solder connections. If this is the case, simply connecting them back could restore function to the button. Related Homepag can be used to restore function to any loose connections inside the fob. Finally, if any of the buttons made of rubber on the front of the key fob have stopped working or require a very hard press to work it is likely the graphite disks at the back of the button are deteriorating and need to be replaced. This can be done by rubbing a pencil across the disks, which will bring the button back to working. If none of these solutions work, or if you still are unable to get the button to respond when you press it hard, it is possible that the circuitry has failed. It is possible to fix this issue by cleaning and re-soldering the fob, but you should have an extra in case it doesn't work. Circuitry If the keys fob buttons are functioning the circuit board in your remote may be dirty. The issue can be solved through a thorough examination. The most frequent causes of dirty circuit boards is water and broken cases. A broken case can allow water and other debris to enter the circuit board, causing it to short out. Water can also damage pins and vias, which are the tiny connectors found on the board. If you're able to remove your key fob, and you're not afraid of some mess, we can remove the solder from the buttons and put new ones in their place. It's also worth examining the battery terminal connections. They can get very dirty and if they're loose the buttons may 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 order. Non-Remote Transponder Chips Sealed non-remote transponder chips are much more durable than the remote fobs they are contained in, but they can still be cracked by a hole made in them or pushed over by a lawnmower or door handle for a car. The majority of non-remote transponder chip failures can be attributed to blowing fuses. If you are not comfortable opening the key fob, you can take the circuit board off and use a multimeter to check that the diode is functioning correctly. If you're not sure with this, go to your local Oreilly or hardware store and use their RF frequency tester. This will inform you whether the key fob transmits a signal. Programming Key fobs aren't indestructible and are susceptible to damage through a variety of causes. They may lose their connection with the receiver inside your vehicle due to shocks or low battery, which calls for changing the program. A professional auto locksmith or a main dealer will be able to reprogram your key fob to get it back up and running. If, in the unlikely event that resetting and repairing your key fob isn't working it could be the time to replace it entirely.