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How to Fix a mobile key fob Repair Fob That isn't Working

If your key fob doesn't work then you can fix it by following a few simple steps. The first step is to be sure that it's not your backup remote.

If your backup remote can unlock and lock the doors of your vehicle, it is likely that the primary remote isn't functioning. Most car remote repair key failures result from battery or circuitry problems.

Battery

It is not unusual for the battery inside a key fob for cars to degrade. It is easy to replace a battery. However it is essential that you choose the right type. You can refer to your owner's manual or call the manufacturer to find out the right type. It is also essential to inspect the battery compartment, since 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 the buttons appear stuck or broken It may be necessary to take the remote apart and rework its components. You can also try reprogramming your car to recognize the new key fob.

Buttons

Through frequent use, key fobs may become worn and dirty. This is not uncommon however it can cause buttons to cease functioning or require a difficult press to get them to function. This can be a huge hassle especially if you're away from home and need to start your vehicle. Even worn-out or malfunctioning buttons can be fixed with a little effort and materials you already have at home.

First, check that the batteries have been correctly inserted and that the indentation at the back of the button is filled. Then, carefully open up the remote and examine the circuit board. Examine for signs of rust or other indications that the buttons are worn or damaged, like missing paint that is conductive. Use a Q-tip dipped into rubbing alcohol to gently clean any membrane contact that has worn out or where conductive paint is missing. Avoid rubbing too hard, because this could damage the conductive painting and prevent the button from firing when it is it is pressed.

Also, carefully check the battery connector terminals for an unattached solder connection. If this is the case, soldering them back in place could restore functionality to the button. The same procedure can be used to restore function to any other loose connections within the fob.

In the end, if any of the buttons made of rubber that are on the front of the key fob aren't working or require a difficult press to function it is likely the graphite disks at the back of the button are deteriorating and require replacement. This can usually be done by rubbing a pencil across the disks, which will bring the button back to life.

If none of these solutions work, or if you still cannot get the button to respond when you press it hard, it is possible that the circuitry has failed. It is possible to fix this issue by cleaning and re-soldering the button, but you should have another spare in case it does not work.

Circuitry

The circuit board inside your remote control could be dirty regardless of whether the buttons on the key fob work or not. This issue can be fixed by a thorough inspection. Broken cases and water are the most common causes of dirty boards. A damaged case allows water and other debris to enter and short circuit the electronics. Water can also damage pins and vias, which are small connectors found on the board.

If you're able to open your key fob, and you're not afraid of making a mess, we can de-solder the buttons and solder new ones in their place. It's also worth examining the battery terminal connections. They can get very dirty and if they're loose the buttons might not work or even stick in their down position. Soldering the terminals and buttons to their original positions is often enough to restore a non-working fob back to working.

Non-Remote Transponder Chips

The non-remote chips sealed in a sealed case 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 lawnmowers is pushed over them. The failure of the fuse is usually to blame for non-remote chip failures.

If you are not comfortable opening the key fob, you can remove the circuitboard and utilize a multimeter to check that the diode is working properly. If you're not comfortable doing this, go to your local hardware store or Oreilly's and they will usually have an radio frequency tester that can determine if the key fob is sending signals.

Programming

Key fobs are subject to many abuses and aren't completely indestructible. They may lose their connection to the receiver in your car due to shock or a low battery, which calls for them to be reprogrammed. A professional auto locksmith, or a dealer in the main can reprogram the keyfob to get it functioning again. In the event that resetting or repairing your key fob doesn't work, it could be time to replace it entirely.