How to Fix a Key Fob That isn't Working
If your key fob does not work then you can fix it by following a few simple steps. The first step is to make sure it's not the backup remote.
If the backup is able to lock and unlock your car doors, then there's a likely issue with the primary remote. The most frequent causes of key malfunctions for car remotes are issues with the circuitry or battery.
Battery
The battery inside the key fob may wear out over time. It is easy to replace the battery. However it is essential 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's also a good idea to inspect the battery compartment thoroughly since dead batteries may leak harmful chemicals that can cause damage to the remote. If changing the battery doesn't fix the issue there may be additional issues requiring professional attention. If buttons are broken or stuck, for example it could be necessary to remove the remote and rebuild each component. It is also possible to reprogramme the vehicle to recognize the new device.
Buttons
Key fobs may become dirty and worn out from frequent use. This is not uncommon however it can cause buttons to stop working or require a very difficult press to get them to work. This can be very frustrating, especially if you are away from home and need to start your car. Fortunately, even worn-out or broken buttons can usually be fixed with a little time and a few materials you may already have around the house.
First, check that the batteries are properly charged and that the indentation on the back of the button is filled. Then, carefully open up the remote and look at the circuit board. Examine for signs of rust or other indications that the buttons are worn or damaged, such as missing paint that is conductive. Use a Q-tip dipped into alcohol to gently clean any membrane contact that is worn out or where conductive paint is missing. Don't rub too hard in order to damage the conductive paint, and block the button from firing when pressed.
Also, make sure to inspect the battery connector's terminals to ensure an unattached solder connection. If this is the case, soldering them back in place may restore function to the button. You can follow the same method to restore functionality to any other loose connection within the fob.
If, for instance, any of the rubber buttons on the front of the key fob stop working or require a difficult press to function, it is likely that the graphite disks at the back of the button are deteriorating and need to be replaced. This can usually be done by rubbing a pencil on the disks, which will bring the button back to its original state.
If none of these solutions work, or if you still are unable to get the button to respond when you press it hard, it could be that the circuitry is failing. It is possible to fix this by cleaning and re-soldering your fob but you should also have an extra in case it does not work.
Circuitry
Whether or not the key fob buttons are working the circuit board in the remote could be dirty. This problem can be resolved through a thorough examination. Broken cases and water are the most common causes of boards that are dirty. A broken case can allow water and other debris to enter the circuit board, which can cause it to short. Water can also damage pins and connectors on the board called via's.
If you're able to open your key fob, and aren't afraid of making a mess, we can take the buttons out of their sockets and put in new ones. remote key fob repair 's also worth looking at the battery terminal connections. They can get very filthy and if they're not tight enough, the buttons may not work or even stick in their down position. Soldering the terminals and button's back in their place is generally all it takes to restore the key fob that is not working to working order.
Non-Remote Transponder Chips
The sealed non-remote chips are more durable than remote fobs. However, they can be cracked if a hole is drilled into them or if a car door handle or lawnmowers plows over them. Most of the time non-remote transponder chip failures can be blamed on blowing fuses.
If you're handy enough to remove a key fob that is sealed and can tolerate the mess, you can take off the circuit board and test the fuse with an instrument to verify diode function. If you're not confident doing this, visit your local hardware store or the Oreilly's and they will usually have an RFID frequency tester that can determine if the key fob is sending signals.
Programming
Key fobs endure lots of abuse and aren't indestructible. They can lose their pairing with the receiver inside your vehicle because of shocks or a low battery, requiring the reprogramming. A professional auto locksmith or a main dealer can reprogram your key fob and get it functioning again. If resetting or repairing your keyfob does not work it may be necessary to replace it.