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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, make sure that it's not the backup remote.
If your backup remote can lock and unlock the doors of your car, it is likely that the main remote isn't functioning. The most common causes of key malfunctions for car remotes are issues with the circuitry or battery.
Battery
The battery in the key fob could be worn out over time. It is simple to replace a battery. However it is essential that you use the correct kind. You can check your owner's guide or contact the manufacturer to determine the right kind. It is also essential to check the battery compartment, since batteries that are not working properly can release caustic chemicals which can damage the remote. If changing the batteries doesn't solve the issue it could be because there are other issues that require professional attention. For instance, if the buttons seem stuck or damaged it could be necessary to disassemble the remote and rework its parts. It is also possible to reprogramme the vehicle to recognize the new remote.
Highly recommended Webpage can get dirty and worn out from frequent use. This is not uncommon however, it can cause buttons to cease functioning or require a hard press for them to function. This can be a huge hassle, especially if you are away from home and you need to start your vehicle. Fortunately, even worn-out or damaged buttons can be fixed with a bit of time and some of the materials you may already have around the home.
First, check that the batteries are properly installed and that the indentation at the back of the button is filled. Take the remote apart and inspect the circuit board. Look for signs of corrosion or other indications that buttons are worn out or damaged, such as missing the conductive paint. Use the Q-tip, dipped in alcohol, gently clean any membrane contacts that have damaged or have conductive paint missing. Do not rub too vigorously, as this could erode the conductive paint, and block the button from firing when it is pressed.
Also, be sure to check the battery connector's terminals for a loose solder connection. If this is the case, reconnecting them could restore functionality to the button. The same method can be used to restore functionality to any other loose connections inside the fob.
If any of the rubber buttons located at the front of the keyfob aren't working or require being press very hard the graphite disks on the back of the button could have worn out and require replacement. It is usually done by rubbing a pen across the disks. This should bring the button to life.
If none of this is useful or if the button still does not respond to a hard press, then it may be that the circuit board itself has become damaged. It is possible to fix the issue by cleaning and re-soldering the fob however, you should have another spare in case it does not work.
Circuitry
The circuit board of the remote control could be dirty, regardless of whether the buttons on the key fob work or not. This issue can be fixed by a thorough inspection. The most frequent causes of dirty circuit boards is water and broken cases. A damaged case can allow water and other debris to enter and short out the electronics. Water can also damage pins and vias, which are the tiny connectors found on the board.
If you're able to open your key fob, and you're not afraid of a little mess, we can de-solder the buttons and solder new ones in their place. Also, it's worth checking the connections between battery terminals. They can get very dirty and if they're loose, the buttons might not function or may even remain in their down position. Soldering terminals and buttons back into place is usually enough to restore a non-working fob to working.
Non-Remote Transponder Chips
The non-remote chips that are sealed are more durable than remote fobs, however they are susceptible to breaking if a hole is drilled into them or if a car door handle or lawnmowers is pushed over them. The failure of the fuse is usually to blame for non-remote chip failures.
If you're handy enough to open up a sealed non-remote key fob and are willing to put up with the mess, you can remove the circuit board and examine the fuse with a multimeter for proper diode function. If you're not comfortable with this, you can go to your local Oreilly or hardware store and test their RF frequency tester. This will let you know whether the key fob is sending signals.
Programming
Key fobs endure many abuses and aren't completely indestructible. They can lose their pairing with the receiver in your vehicle because of shocks or a low battery, requiring reprogramming. A professional auto locksmith, or main dealer, can reprogram your keyfob to get it functioning again. In the rarer case that resetting and fixing your key fob doesn't work it may be time to replace it completely.