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 fix it. First, ensure that it's not the backup remote.
If the backup is able to lock and unlock your car doors, then there is likely an issue with the main remote. The majority of car remote key malfunctions are caused by circuitry or battery problems.
Battery
The battery inside a key fob can get worn out over the course of time. It is quite simple to change out a battery, although it is important to ensure you use the right type that you can refer to the owner's manual or talk to the dealer for the manufacturer to find out what kind of battery you need. It's also a good idea to examine the battery compartment with care because dead batteries can release caustic chemicals that could harm the remote. If replacing the battery does not solve the issue there could be other issues requiring professional attention. For example, if buttons appear stuck or broken, it may be necessary to take the remote apart and rework its components. You could also try reprogramming the vehicle to recognize the new fob.
Buttons
Through frequent use, key fobs could wear out and become dirty. This is not uncommon, but it can cause buttons to cease working or require a hard press for them to work. This can be frustrating particularly when you're away from home and need to start your car. Fortunately, even worn out or damaged buttons can be fixed with a little time and a few materials you have in the home.
First, ensure that the batteries are charged correctly and that the indentation on the back of the button is filled. Open the remote carefully and look over the circuit board. Check for indications of rust or other indications that the buttons are worn or damaged. For example there could be conductive paint missing. Use a Q-tip that has been dipped in alcohol to gently clean any membrane contact that has become damaged or where conductive paint is missing. Avoid rubbing too hard since this could cause damage to the conductive paint and stop the button firing when it is pressed.
Also, carefully check the battery connector terminals for any loose solder connections. Soldering them back in place will allow the button to function again if this is the situation. g28carkeys.co.uk can use the same method to restore functionality to any other loose connection within the fob.
If any of the rubber buttons on the front of the keyfob aren't working or require being pressing very hard the graphite disks at the back of the button might have worn out and will require replacement. This is usually done by rubbing a pencil on the disks. This should bring the button back to its original state.
If all of this doesn't help or if the button doesn't respond to a hard push It could be because the circuit board has gone bad. It is possible to fix the issue by cleaning and re-soldering the fob but you should also have another spare in case it doesn't work.
Circuitry
The circuit board in the remote control could be dirty regardless of whether the buttons on the key fob function or not. This problem can be resolved 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 get in and short circuit the electronics. Water can also eat through pins and vias, which are tiny connectors that are found on the board.
If you're handy enough to open up your key fob and aren't afraid of a little mess, we can take off the buttons and put new ones in their place. It's also worth checking the battery terminal connections. If they are loose, the buttons may not function properly or become stuck in their down position. Soldering the terminals back to their original positions is often enough to return a malfunctioning fob back to working.
Non-Remote transponder chips
The non-remote chips that are sealed are more durable than their remote fobs. However, they are susceptible to breaking in the event of a hole being drilled in them, or when a door handle for a car or lawnmower runs over them. Most of the time, non-remote transponder chip malfunctions could be attributed to blowing fuses.
If you're not confident opening the key fob, take the circuit board off and use a multimeter to check that the diode is operating properly. If you don't feel comfortable with this, you can go to your local Oreilly or hardware store and utilize their RF frequency tester. This will tell you whether the key fob is sending signals.
Programming
Key fobs aren't impervious to destruction and are susceptible to being damaged by a lot of things. They can lose their pairing to the receiver in your car because of shock or a low battery, which calls for the reprogramming. A professional auto locksmith or main dealer can reprogram your key fob and get it functioning again. In the rarer case that resetting and fixing your key fob isn't working it could be the time to replace it completely.