How to Fix a Key Fob That isn't Working
If your key fob isn't working There are a few simple steps that can be taken to fix it. The first step is to make sure that it's not the backup remote.
If the backup can lock and unlock your car doors then there is likely an issue with the primary remote. Most car remote key failures result from circuitry or battery problems.
Battery
The battery in the key fob may wear out over time. It is relatively easy to replace batteries, but it is important to make sure that 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 the kind of battery you need. remote car key repairs is recommended to examine the battery compartment thoroughly because dead batteries can release caustic chemicals that could damage the remote. If changing the batteries does not solve the issue it could be because there are other issues that require professional attention. For instance, if the buttons seem stuck or broken, it may be necessary to take the remote apart and rebuild its components. You could also try reprogramming the vehicle to recognize the new remote.
Buttons
From frequent use, key fobs can become worn and dirty. This is not unusual, but it can cause buttons to cease working or require a very long press to work. This can be a hassle particularly when you're away from your home and have to turn on your car. Fortunately, even worn-out or malfunctioning buttons can often be fixed with a bit of time and a few items you might already have in the house.
First, check that the batteries are properly charged and that the indentation on the back of the button is filled. Open the remote carefully and inspect the circuit board. Examine for evidence of rust, or other indications that the buttons are damaged or worn out. For instance the paint that conducts electricity could be missing. Utilizing a Q-tip that has been dipped in rubbing alcohol, gently clean any membrane contacts that have damaged or where conductive paint is missing. Do not rub too vigorously as this can damage the conductive paint, and block the button from firing when you press it.
Also, make sure to inspect the battery connector's terminals to ensure a loose solder connection. Soldering them back to their original position will restore the button's functionality If this is the case. You can apply the same method to restore functionality to any other loose connection within the fob.
If any of the rubber buttons at the front of the keyfob isn't working or require being press very hard, the graphite disks at the back of the button might have worn out and will need to replaced. It is usually done by rubbing a pen across the disks. This should bring the button back to life.
If none of these solutions work, or if you still not be able to get the button respond when you press it hard, it is possible that the circuitry is failing. It is possible to fix the issue by cleaning and re-soldering your fob however, you should have a spare in case it doesn't work.
Circuitry
Whether or not the key fob buttons function the circuit board in your remote may be dirty. A thorough examination is often enough to resolve this problem. The most common causes of dirty circuit boards is water and damaged cases. A damaged case can let water and other debris to enter the circuit board, which can cause it to short. Water can also destroy pins and small connectors on the board called via's.
If you are handy enough to open your key fob, and don't mind making an mess, you can remove the buttons from their sockets and solder in new ones. It's also worth checking the connections between battery terminals. If they're loose, the buttons may not function properly or become stuck in their down position. Soldering terminals and buttons back to their proper positions is usually enough to bring a non-working fob to working.
Non-Remote Transponder Chips
Sealed non-remote transponder chips are much more durable than remote fobs that have them however they are still susceptible to being damaged by a hole that is that is drilled into them or over by a lawnmowers or door handle for a car. Fuse failures are usually to blame for non-remote chip failures.
If you are not comfortable opening the key fob, remove the circuitboard and utilize a multimeter to verify that the diode is functioning correctly. If you're not confident doing this, head to your local hardware store or Oreilly's and they'll usually have an radio frequency tester that can let you know whether the key fob is sending signals.
Programming
Key fobs are subject to lots of abuse and aren't completely indestructible. They may lose their connection with the receiver inside your vehicle because of shocks or a low battery, which calls for the reprogramming. A professional auto locksmith or main dealer can reprogram your key fob and get it back up and running. If, in the unlikely event that resetting and fixing your key fob isn't working it may be time to replace it completely.