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How to Fix a Key Fob That isn't Working

If your key fob isn't functioning A few easy steps can be taken to fix it. First, ensure that it's not the backup remote.

If the backup remote is able to lock and unlock your car doors then there's a likely issue with the main remote. The most common causes for key problems with your Mobile car key repair remote are issues with the circuitry or battery.

Battery

It is not unusual to find a battery on a car key fob to wear out. It is fairly easy to replace batteries, but it is important to ensure you choose the correct type and you can consult your owner's manual, or contact the manufacturer's dealer to determine the type of battery you require. It is also important to inspect the battery compartment, as batteries that are not working properly can release toxic chemicals that could damage the remote. If replacing the battery does not solve the issue there could be other issues requiring professional attention. If the buttons are broken or stuck for instance, it may be necessary disassemble the remote and rework each component. You can also try reprogramming the vehicle to recognize the new fob.

Buttons

Key fobs can become dirty and worn-out from frequent use. This is not unusual however, it can cause buttons to cease functioning or require a difficult press to get them to function. This can be extremely frustrating especially if you're away from home and need to start your vehicle. Even worn-out or malfunctioning buttons can be fixed with a bit of time and materials you already have at home.

First, check that the batteries are charged correctly and that the indentation on the back of the button is filled. Then, carefully open up the remote and look at the circuit board. Look for signs of corrosion or other indications that the buttons are worn out or damaged, such as missing conductive paint. Use a Q-tip that has been dipped in alcohol, gently clean any membrane contacts that have become damaged or where conductive paint is missing. Be careful not to rub too hard, because this could damage the conductive painting and prevent the button firing when pressed.

Check the battery connector's terminals for loose solder connections. Soldering them back to their original position can restore the button's functionality in the event that this is the case. You can follow the same procedure 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 pressed extremely hard the graphite disks at the back of the button might have worn out and will require replacement. You can usually do this by rubbing a pen over the disks. This should bring the button back to life.

If none of this is helpful, or if the button doesn't respond to a firm press, then it may be that the circuit board has become damaged. It is possible to fix this by a quick clean, and re-soldering, but it is best to have an extra fob on hand in the event that this method doesn't work for you.

Circuitry

The circuit board of your remote control could be dirty, regardless of whether the buttons on the key fob function or not. A thorough examination will usually resolve this issue. Broken and damaged cases are the most frequent causes of dirty boards. A broken case can allow water and other debris to enter the circuit board, causing it to short out. Water can also get through pins and vias, which are small connectors found on the board.

If you're able to open up your key fob repair fob, and you're not afraid of some mess, we can remove the solder from the buttons and solder new ones in their place. Also, you should check the connections between battery terminals. If they're loose, the buttons could not function properly or become stuck in their down position. Soldering the terminals and button's back in their place is generally all it takes to restore a non-working key fob to functioning condition.

Non-Remote transponder chips

Sealed non-remote transponder chips are more durable than remote fobs they are contained in, but they can be damaged by a hole that is drilled into them or run over by a lawnmowers blade or car key repair cost door handle. The majority of non-remote transponder chip failures could be attributed to a blown fuse.

If you're able to remove the sealed key fob and can tolerate the mess, you can take off the circuit board and examine the fuse with an instrument to verify diode function. If you're not comfortable with this, visit your local Oreilly or hardware store and utilize their RF frequency tester. This will inform you whether the key fob sends a signal.

Programming

Key fobs endure many abuses and aren't impervious to damage. They can lose their pairing with the receiver inside your vehicle because of shocks or a low-battery, which requires the reprogramming. A professional auto locksmith, or the main dealer can reprogram your keyfob to get it working again. In the rarer case that resetting or repairing your repair key fob isn't working, it could be time to replace it all over again.