How to Fix a Key Fob That isn't Working
If your key fob doesn't work and you're not sure why, you can fix it with a few simple steps. The first step is to make sure that it's not the backup remote.
If your backup remote can lock and unlock the doors of your car, then it is most likely that the primary remote isn't working. The majority of car remote key malfunctions are caused by circuitry or battery problems.
Battery
It is not unusual for the battery in a key fob for cars to get worn out. It is simple to replace batteries. However, it is important that you use the correct kind. You can check your owner's manual or call the manufacturer to inquire about the right type. It is also crucial to check the battery compartment, as dead batteries can leak caustic chemicals that can harm the remote. If changing the batteries doesn't solve the issue, it may be that there are other issues that require attention from a professional. For instance, if buttons seem stuck or broken it could be necessary to take the remote apart and rebuild its components. You could also try reprogramming the vehicle to recognize the new key fob.
Buttons
Key fobs can become dirty and worn out from frequent use. It is not uncommon for buttons to cease functioning, or require a hefty push to make them work. repair car key can be frustrating, especially when you are away from home and have to start your car. Even malfunctioning or worn-out buttons can be fixed with a little effort and tools you already have at home.
First, check that the batteries have been correctly placed and that the indentation at the back of the button is filled. Then, carefully remove the remote and inspect 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 a Q-tip that has been dipped in alcohol, gently clean any membrane contacts that are worn or have conductive paint missing. Be careful not to rub too hard, because this could damage the conductive paint and block the button firing when the button is pressed.
Also, make sure to inspect the battery connector terminals for an unattached solder connection. If this is the case, connecting them back could restore function to the button. You can use the same method to restore functionality to any other loose connection within the fob.
If any of the rubber buttons on the front of the keyfob isn't working or require being pressing very hard the graphite disks at the back of the button may have worn out and need to replaced. This can usually be done by rubbing a pencil across the disks, which should bring the button back to its original state.
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. This can be fixed with a quick clean and refitting, but it's recommended to have an additional fob available in the event this method does not work for you.
Circuitry
The circuit board of your remote control may be dirty, regardless of whether the buttons on the key fob work or not. The issue can be solved by a thorough inspection. The most common causes of dirty circuit boards is water and damaged cases. A damaged case can allow water and other debris to get in and short out the electronic components. Water can also damage 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 making some mess, we can remove the buttons from their sockets and solder in new ones. Also, it's worth checking the connections between battery terminals. They can get very dirty and if they're loose the buttons might not work or may even remain in their down position. Soldering the terminals and buttons back into place is typically all it takes to restore a non-working key fob to working condition.
Non-Remote Transponder Chips
Sealed non-remote transponder chip are more durable than remote fobs that contain them but they can be broken by a hole being drilled into them or run over by a lawnmower or door handle for a car. The failure of the fuse is usually the cause of non-remote chip failures.
If you are not comfortable opening the key fob, you may remove the circuitboard and utilize a multimeter to check that the diode is working properly. If you're not comfortable doing this, visit your local hardware store or the Oreilly's and they'll usually have an RF frequency tester that will let you know if the key fob is sending signals.
Programming
Key fobs aren't indestructible and are susceptible to damage by a variety of factors. They can lose their pairing to the car's receiver due to shock or a low battery, which calls for the reprogramming. A professional auto locksmith or main dealer can reprogram your key fob and get it working again. In the event that resetting and fixing your key fob fails, it could be time to replace it entirely.