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 by following just a few steps. First, make sure that it's not your backup remote.
If the backup remote is able to lock and unlock your car door, then there's a likely issue with the main remote. Most problems with car remote keys result from circuitry or battery problems.
Battery
The battery inside a key fob can be worn out over time. It is fairly easy to replace a battery, although it is crucial to ensure that you select the correct one that you can refer to your owner's manual, or contact the manufacturer's dealer to find out what kind of battery you need. It is also a good idea to examine the battery compartment with care, as dead batteries sometimes release caustic chemicals that could harm the remote. If changing the batteries doesn't solve the problem it could be because there are other issues that require attention from a professional. If buttons are stuck or broken, for example it could be necessary to take the remote apart and rework each component. You can also try reprogramming the vehicle to recognize the new device.
Buttons
Key fobs can become filthy and worn out due to repeated use. This is not unusual however, it can cause buttons to stop functioning or require a difficult press to get them to function. This can be extremely frustrating particularly if you're away from home and you need to start your car. Fortunately, even worn-out or malfunctioning buttons can often be fixed with just a bit of time and some of the materials you might already have in the house.
First, check that the batteries are up correctly and that the indentation on the back of the button is filled. Open the remote carefully and inspect the circuit board. Examine for signs of rust or other indications that the buttons are worn or damaged, like missing conductive paint. Use a Q-tip, dipped in rubbing alcohol to gently clean any membrane contact that has become worn out or where conductive painting is missing. Be careful not to rub too hard, because this could damage the conductive painting and prevent the button from firing when it is pressed.
Check the battery connector terminals for loose solder connections. If this is the case, reconnecting them may restore function to the button. You can use the same process to restore functionality to any other loose connection in the fob.
If, for instance, any of the buttons made of rubber that are on the front of the key fob have stopped working or require a very hard press to work it is likely that the graphite disks on the back of the button are deteriorating and require replacement. 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 is possible that the circuitry is failing. It is possible to fix this 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 in your remote control could be dirty, regardless of whether the buttons on the key fob are working or not. The issue can be solved through a thorough examination. Broken and damaged cases are the most frequent causes of boards that are dirty. A damaged case can allow water and other debris to enter and short out the electronic components. Water can also damage pins and connectors that are small on the board, which are known as via's.
If you're handy enough to open up your key fob and aren't afraid of making a mess, we can take off the buttons and then solder new ones in their place. It's also worth examining the battery terminal connections. If key fob repairs , the buttons might not function properly or become stuck in their down position. Soldering the terminals and buttons back in their place is generally all that's required to return the key fob that is not working to working condition.
Non-Remote transponder chips
The sealed non-remote chips are more durable than their remote fobs, but they are susceptible to breaking if a hole is drilled into them or when a door handle for a car or lawnmowers is pushed over them. Failures of the fuse are typically to blame for non-remote chip failures.
If you're able to open a sealed non-remote key fob and are able to bear the mess, you can take off the circuit board and check the fuse with a multimeter to ensure that it is functioning as intended. function. If you're unsure about doing this, head to your local hardware store or the Oreilly's and they usually have a radio frequency tester that can let you know if the key fob is sending signals.
Programming
Key fobs aren't impervious to destruction and are susceptible to damage by a lot of things. They may lose their connection with the receiver inside your vehicle because of shocks or a low battery, which calls for reprogramming. A professional auto locksmith or dealer can reprogram your key fob to get it back up and running. If resetting or fixing your key fob fails, you may need to replace it.