How to Fix a Key Fob That isn't Working
If your key fob doesn't work then you can fix it by following just a few steps. The first step is to make sure it's not the backup remote.
If your backup remote can unlock and lock the doors of your car, it is likely that the primary remote isn't functioning. Most problems with car remote keys are caused by battery or circuitry problems.
Battery
It is not uncommon for the battery in a car key fob to wear out. It is quite simple to change out the battery, however it is crucial to ensure you select the correct one; you can look in your owner's manual, or contact the dealer of the manufacturer to find out what kind of battery you require. It is also essential to inspect the battery compartment as dead batteries can leak toxic chemicals that could damage the remote. If replacing the batteries doesn't solve the problem it could be because there are other issues that require attention by a professional. For instance, if buttons seem to be stuck or broken It may be necessary to disassemble the remote and rework its parts. You could also try reprogramming your car to recognize the new key fob.
Buttons
Through repeated use, key fobs can wear out and become dirty. This is not unusual however it can cause buttons to cease working or require a very long press to work. This can be extremely frustrating especially if you're away from home and need to start your car. Fortunately, even worn-out or malfunctioning buttons can often be fixed with just a bit of time and a few materials you have in the house.
First, check that the batteries have been correctly placed and that the indentation on the back of the button has been filled. Take the remote apart and inspect the circuit board. Look for signs of rust or other indications that the buttons have been damaged or worn out. For instance, conductive paint may be missing. Then, using a Q-tip that has been dipped in alcohol, gently clean any membrane contacts that are damaged 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.
Examine the battery connector's terminals for loose solder connections. Soldering them back into place can restore the button's functionality in the event that this is the case. The same procedure can be used to restore functionality to any other loose connections inside the fob.
If, for instance, any of the rubber buttons on the front of the key fob have stopped working or require a very difficult press to function it is likely that the graphite disks on the back of the button are deteriorating and need to be replaced. You can usually do this by rubbing a pen across the disks. This should bring the button back to life.
If all of this doesn't help, or if the button doesn't respond to a firm press It could be the case that the circuit board has gone bad. It is possible to fix this by cleaning and re-soldering the button however, you should have an extra in case it does not work.
key fob repairs of your remote control could be dirty regardless of whether the buttons on the key fob work or not. This problem can be resolved by a thorough inspection. Broken cases and water are the most common causes of boards that are dirty. A damaged case can allow water and other debris into the circuit board, causing it to short. Water can also destroy pins and small connectors on the board, referred to as via's.
If you're handy enough to open your key fob and don't mind a little mess, we can remove the solder from the buttons and put new ones in their place. Also, you should check the connections between the battery terminals. If they are loose, the buttons may not function properly or become stuck in their down position. Soldering the terminals, and putting the button back in place is usually all that's required to return keys that are not in functioning condition.
Non-Remote Transponder Chips
The non-remote chips sealed in a sealed case are more durable than their remote fobs, but they are susceptible to breaking when a hole is made in them, or in the event that a door handle of a car or lawnmower runs over them. The failure of the fuse is usually the cause of non-remote chip failures.
If you are not comfortable opening the key fob, you may remove the circuitboard and use a multimeter to check that the diode is working properly. If you don't feel comfortable with this, visit your local Oreilly or hardware store and utilize their RF frequency tester. This will tell you whether the key fob transmits signals.
Programming
Key fobs endure lots of abuse and aren't impervious to damage. They may lose their connection with the receiver inside your vehicle due to shocks or low battery, which calls for the reprogramming. A professional auto locksmith, or a dealer in the main, can reprogram your key fob and get it back working again. If resetting or repairing the keyfob is not working it is possible to replace it.