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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. The first step is to make sure it's not the backup remote.
If the backup remote is able to lock and unlock your car doors, it is most likely an issue with the main remote. Most problems with car remote keys result from circuitry or battery problems.
Battery
It is not unusual for the battery in a key fob for cars to degrade. It is quite simple to replace a battery, although it is crucial to make sure that you choose the correct type and you can consult your owner's manual or contact the dealer for the manufacturer to find out what kind of battery you require. It is also crucial to inspect the battery compartment as dead batteries can leak caustic chemicals which can damage the remote. If replacing the batteries doesn't solve the problem, it may be that there are other issues that require attention from a professional. For instance, if buttons seem to be stuck or damaged, it may be necessary to disassemble the remote and rebuild its components. It is also possible to reprogramme the vehicle to recognize the new device.
Buttons
Key fobs may become filthy and worn out due to repeated use. This is not unusual, but it can cause buttons to cease working or require a long press to function. This can be frustrating especially when you're away from home and need to turn on your car. Fortunately, even worn out or damaged buttons can be fixed with a little time and a few items you may already have around the home.
First, make sure the batteries are charged correctly and that the indentation on the back of the button is filled. Then, open the remote with care and examine the circuit board. Examine for signs of rust or other signs that the buttons are worn or damaged, like missing the conductive paint. Utilizing a Q-tip that has been dipped in alcohol, gently clean any membrane contacts that have become worn or where conductive paint is missing. Avoid rubbing too hard since this could cause damage to the conductive paint and block the button firing when pressed.
Check the battery connector terminals for loose solder connections. Soldering them back to their original position can restore the button's functionality If this is the situation. The same method can be used to restore function to any loose connections within the fob.
If any of the rubber buttons at the front of the keyfob isn't working or need to be press extremely hard, the graphite disks at the back of the button may have worn out and will need to replaced. It is usually done by rubbing a pen across the disks. This should bring the button 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 this by cleaning and re-soldering the button but you should also have another spare in case it doesn't work.
Circuitry
If the key fob buttons function the circuit board in your remote may be dirty. The issue can be solved by a thorough inspection. Broken cases and water are the most frequent causes of dirty boards. A broken case allows water and other debris to enter and short circuit the electronics. Water can also get through pins and vias, which are small connectors that are found on the board.
If you're skilled enough to open your key fob and aren't afraid of making a mess, we can remove the buttons from their sockets and put in new ones. It's also worth examining the battery terminal connections. They can become very filthy and if they're not tight enough, the buttons might not function or may even remain in their down position. Soldering the terminals, and putting the button back in their place is generally all that's required to return keys that are not in functioning condition.
car key repair G28 Car Keys -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 into them or if a car door handle or lawnmower runs over them. Failures of the fuse are typically to blame for non-remote chips failures.
If you're able to remove the sealed key fob and can tolerate the mess, you can take off the circuit board and test the fuse using a multimeter for proper diode function. If you're unsure about doing this, visit your local hardware store or Oreilly's and they usually have an radio frequency tester that can determine if the key fob is sending a signal.
Programming
Key fobs are subject to many abuses and aren't impervious to damage. They may lose their connection with the receiver inside your vehicle due to shocks or a low battery, which calls for the reprogramming. A professional auto locksmith or dealer can reprogram your key fob and get it back up and running. In the rarer case that resetting and fixing your key fob isn't working it may be time to replace it all over again.