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How to Fix a Key Fob That isn't Working
If your key fob isn't functioning There are a few simple steps that can be taken to fix it. The first step is to make sure it's not the backup remote.
If your backup remote is unable to lock and unlock the doors of your car, it is likely that the main remote isn't functioning. The majority of car remote key malfunctions result from battery or circuitry problems.
Battery
It is not unusual for the battery inside a car key fob to get worn out. It is easy to replace a battery. However, it is important that you choose the right kind. You can refer to your owner's guide or contact the manufacturer to inquire about the correct type. It is also essential to check the battery compartment, as batteries that are not working properly can release caustic chemicals that can harm the remote. If changing the batteries doesn't solve the issue it could be because there are other issues that require professional attention. If buttons are damaged or stuck for instance, it may be necessary take the remote apart and rework each component. You could also try reprogramming your vehicle to recognize the new key fob.
Buttons
From repeated use, key fobs can wear out and become dirty. This is not uncommon, but it can cause buttons to cease functioning or require a hard press for them to work. This can be a huge hassle particularly if you're out of town and need to start your car. Even worn-out or malfunctioning buttons are often fixable with a bit of time and materials you already have at home.
First, verify that the batteries have been correctly inserted and that the indentation at the back of the button is filled. Take the remote apart and examine the circuit board. Check for signs of corrosion or other indications that buttons are worn out or damaged, like missing paint that is conductive. Use a Q-tip dipped into rubbing alcohol to gently clean any membrane contact that is worn out or has conductive paint missing. Avoid rubbing too hard because this could damage the conductive paint and block the button from firing when pressed.
Check the battery connector's terminals for loose solder connections. If this is the case, connecting them back can restore function to the button. The same procedure can be used to restore functionality to any other loose connections in the fob.
If any of the rubber buttons on the front of the keyfob are not functioning or require to be pressed extremely hard, the graphite disks at the back of the button might have worn out and require replacement. This is usually done by rubbing a pencil on the disks, which should bring the button back to its original state.
If none of these solutions work or you are unable to get the button to respond when you press it hard, it is possible that the circuitry has failed. This can sometimes be repaired with a quick clean and refitting, but it's recommended to have an additional fob in case this method does not work for you.
Circuitry
If the key fob buttons function the circuit board that is inside your remote might be dirty. A thorough examination will usually resolve this problem. Broken and damaged cases are the most common causes of dirty boards. A damaged case can let water and other debris into the circuit board, which can cause it to short. key car repair can also eat through pins and vias, which are the tiny connectors found on the board.
If key fob repairs are handy enough to open your key fob, and don't mind making some mess, we can take the buttons out of their sockets and put in new ones. It's also worth checking the connections between battery terminals. If they are loose, the buttons could not function properly or become stuck in their down position. Soldering the terminals back to their proper positions is usually enough to restore a non-working fob back to working.
Non-Remote Transponder Chips
Sealed non-remote transponder chips are more durable than the remote fobs that have them but they can still be broken by a hole being that is drilled into them or over by a lawnmower or car door handle. The failure of the fuse is usually to blame for non-remote chips failures.
If you're handy enough to open up a key fob that is sealed and can tolerate the mess, you can easily remove the circuit board and test the fuse using a multimeter for proper diode function. If you're not sure with this, you can visit your local Oreilly or hardware store and use their RF frequency tester. This will inform you whether the key fob sends an RF signal.
Programming
Key fobs take 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 changing the program. A professional auto locksmith or the main dealer can reprogram your keyfob and get it working again. If, in the unlikely event that resetting and repairing your key fob doesn't work it may be time to replace it all over again.