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 primary remote is not working. The majority of car key immobiliser repair remote key malfunctions are caused by circuitry or battery problems.
Battery
It is not unusual for the battery inside the car key fob to wear out. It is fairly easy to change out batteries, Keyless Entry repairs but it is essential to ensure you use the right type that you can refer to the owner's manual or talk to the manufacturer's dealer to find out the kind of battery you require. It's also a good idea to inspect the battery compartment carefully because dead batteries can release caustic chemicals that could cause damage to the remote. If replacing the battery does not fix the issue there may be additional issues requiring professional attention. If buttons are broken or stuck, for example it might be necessary to remove the remote and rebuild each component. You could also try reprogramming the vehicle to recognize the new remote.
Buttons
Key fobs can become dirty and worn-out from repeated use. It is not common to have buttons stop working, or to require a hard press to get them working. This can be very frustrating particularly if you're away from home and you need to start your car. Fortunately, even worn out or broken buttons can usually be fixed with a bit of time and some of the materials you may already have around the house.
First, verify that the batteries are properly placed and that the indentation at the back of the button is filled. Take the remote apart and inspect the circuit board. Examine for signs of rust or other signs that the buttons are worn out or damaged, such as missing the conductive paint. Then, using a Q-tip dipped in rubbing alcohol, gently clean any membrane contacts that have damaged or have conductive paint missing. Avoid rubbing too hard, since this could cause damage to the conductive paint and block the button firing when the button is pressed.
Also, make sure to inspect the battery connector's terminals to ensure any loose solder connections. If this is the case, simply connecting them back may restore function to the button. The same process can be used to restore function to any other loose connections within the fob.
In the end, if any of the buttons made of rubber that are on the front of the key repairs fob have stopped functioning or require a hard press to work it is likely the graphite disks on the back of the button are wearing down and require replacement. You can usually do this by rubbing a pencil over the disks. This should bring the button back to life.
If none of these solutions work or you are unable to get the button to respond when you press it hard, it could be that the circuitry is failing. This can be fixed by a quick clean, and re-soldering, but it is ideal to have a spare fob in case this method doesn't work for you.
Circuitry
The circuit board inside your remote key repair control may be dirty regardless of whether the buttons on the key repair service fob function or not. This issue can be fixed by a thorough inspection. The most common causes for dirty circuit boards is water and broken cases. A damaged case allows water and other debris to enter and short out the electronics. Water can also damage pins and connectors on the board, referred to as via's.
If you're able to open your key fob and aren't afraid of making a mess, we can de-solder the buttons and solder new ones in their place. It's also worth examining the battery terminal connections. They can become very dirty and if they're loose, the buttons may not work or may even remain in their down position. Soldering the terminals, and putting the button back in their place is generally all it takes to restore a non-working key fob to working condition.
Non-Remote Transponder Chips
Sealed non-remote transponder chips are much more durable than remote fobs they are contained in, however they are still susceptible to being damaged by a hole that is made in them or pushed over by a lawnmowers blade or door handle for a car. Most of the time non-remote transponder chips fail, and this could be attributed to blowing fuses.
If you're able to remove a key fob that is sealed and are willing to put up with the mess, you can remove the circuit board and check the fuse with a multimeter for proper diode function. If you're not comfortable with this, you can visit your local Oreilly or hardware store and utilize their RF frequency tester. This will inform you whether the key fob sends signals.
Programming
Key fobs are not indestructible and are susceptible to damage through a variety of causes. They may lose their connection to the receiver in your car remote key fob repair due to shock or a low battery, which calls for the reprogramming. A professional auto locksmith or the main dealer, can reprogram your keyfob and get it up and running again. If resetting or replacing your key fob fails, you may need to replace it.