How to Fix a Key Fob That isn't Working

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

If your backup remote cannot unlock and lock the doors of your car, then it is likely that the main remote isn't working. Most car remote key failures result from circuitry or battery issues.

Battery

It is not unusual for the battery inside the repair car keys key fob to wear out. It is simple to replace the battery. However, it is important that you use the correct type. You can refer to your owner's manual or call the manufacturer to determine the correct type. It is also crucial to check the battery compartment, since batteries that are not working properly can release caustic chemicals that can harm the remote. If changing the battery doesn't fix the issue there could be other issues requiring professional attention. If buttons are damaged or stuck for instance it could be necessary to disassemble the remote and rework each component. You could also try reprogramming the vehicle to recognize the new remote.

Buttons

From frequent use, key fobs could wear out and become dirty. It is not unusual to have buttons stop working, or to require a hefty push to make them work. This can be extremely frustrating, especially if you are out of town and need to start your car key immobiliser repair. Fortunately, even worn out or broken buttons can usually be fixed with just a bit of time and some of the materials you might already have in the home.

First, verify that the batteries are properly installed and that the indentation at the back of the button has been filled. Then, open the remote with care and look over the circuit board. Examine for signs of rust or other indications that the buttons are worn or damaged. For example there could be conductive paint missing. Then, using the Q-tip, dipped in alcohol, vehicle gently clean any membrane contacts that are worn or where conductive paint is missing. Don't rub too hard in order to damage the conductive paint, and block the button from firing when it is pressed.

Examine the battery connector's terminals for loose solder connections. If this is the case, connecting them back can restore function to the button. You can apply the same procedure to restore functionality to any other loose connection inside the fob.

If any of the rubber buttons on the front of the keyfob are not working or require being pressed extremely hard the graphite disks on the back of the button may have worn out and will need to replaced. 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 useful, or if the button does not respond to a hard push, then it may be because the circuit board has gone bad. It is possible to fix this by a quick clean and refitting, but it's ideal to have a spare fob on hand in the event that this method doesn't work for you.

Circuitry

The circuit board inside your remote control may be dirty regardless of whether the buttons on the key fob work or not. This issue can be fixed through a thorough examination. The most common causes for dirty circuit boards is water and damaged cases. A damaged case can allow water and other debris into the circuit board, causing it to short. Water can also damage pins and vias, which are tiny connectors that are found on the board.

If you're able to open up your key fob and aren't afraid of making a mess, we can de-solder the buttons and then solder new ones in their place. Also, you should check the connections between the battery terminals. If they are loose, the buttons might not work or even become stuck in their down position. Soldering the terminals back into place is usually enough to bring a non-working fob back to working.

Non-Remote transponder chips

Sealed non-remote transponder chip are more durable than the remote fobs they are contained in, however they are still susceptible to being broken by a hole being drilled into them or run over by a lawnmower or car door key repair near me handle. The majority of non-remote transponder chip malfunctions could be attributed to a blown fuse.

If you're able to open the sealed key fob and are able to bear the mess, you can remove the circuit board and test the fuse using an instrument to verify diode function. If you're not sure with this, visit your local Oreilly or hardware store and test their RF frequency tester. This will inform you whether the key fob sends an RF signal.

Programming

Key fobs endure lots of abuse and aren't impervious to damage. They can lose their pairing with the receiver inside your vehicle due to shocks or low battery, which calls for changing the program. A professional auto locksmith or dealer will be able to reprogram your key fob to get it functioning again. If resetting or replacing your key fob fails it may be necessary to replace it.