Car Key Fob Repair - How to Get Back on the Road Even If Your Keyless Entry isn't Working
Key fobs can have issues over time, including a loss of functionality. While some issues might require professional attention, the majority are fixable at home.
The first step is generally to replace the battery. Most fobs use flat watch-style batteries that are readily available at hardware stores or auto parts stores.
Dead Battery
When a key fob battery fails, it can be a huge inconvenience particularly if you're away from home. However, there are options to get back on the road even if your car's keyless entry doesn't work.
One of the first things to be sure of is whether the key fob's buttons still function. If they aren't, the problem could be with the car's locks.
If your keys won't unlock, you may find a mechanical slot in the trim around the door handles or on your car (consult the owner's manual). Insert the mechanical key and try again. If this doesn't work there are some cars that have an app that lets you unlock the doors remotely. For example, the FordPass Connect app, myChevrolet mobile app, and myMazda app allow owners to unlock their doors with their smartphones. However, these apps are subject to an annual cost.
It is also important to ensure that your key fob isn't draining your vehicle's battery by resting on it. A dead key fob can drain your battery fast, especially if it is used to control the TV or phone while you are watching.
The key fob should be held right to the car's start button can sometimes start a key fob with a low battery. This simple fix could save you from a trip to your dealer or certain Interstate All Battery Centers.
If your key fob does not work try testing it in a vehicle that has an ignition button. If it doesn't work, you might need to replace the battery on your fob. It's a great idea to keep a spare key fob in your backpack or purse.
Damaged Buttons
It is possible that your key fob is damaged and has a button. Your key fob contains a circuit with "contact pads" which are covered by an electrically conductive film. This film wears off over time. This wear could cause your device to respond slow or not respond at all.
key repairs is that the contact pad on a car key fob is simple to replace and can be done so with the help of a simple flathead screwdriver. If, however, the key fob is badly damaged or broken in any way, it could be more difficult to open up the case, and you'll be required to take the fob into an auto repair shop to be repaired.
It's not uncommon for a key fob being dropped, trampled or even exposed to water. These incidents can cause physical damage, such as breaking and snapping keys.
This could also cause internal damage to the fob that could cause a malfunction. This is why it's a good idea to carry a spare key fob inside your purse or pocket in case you damage the one you own.
If your key fob's buttons aren't working to the extent they should, you should first verify that the battery is in good working condition. Key fobs don't require an electronic device. They are powered by the same battery for two dollars that is used in hearing aids and watches. These batteries are available at drug, hardware, and online stores.
If the battery is in good condition it is possible that the buttons are dirty or worn out. You can easily clean them with a damp cloth. If they're still not responding, you can try a different key fob to see whether the problem is with yours or with a specific type of car key fob. If the other fob is working then it's likely your key fob has to be reprogrammed or perhaps replaced entirely.
Reprogramming
The secret world of car keys fobs is more complex than many myths suggest. Basic fobs work with radio frequency signals that are specific to each car. The fobs must be properly programmed to unlock and begin the vehicle. Unfortunately it's not as easy as pressing a few buttons, and with a few exceptions, it has to be done by a dealer.
Refer to the owner's manual for specific instructions. Certain manufacturers, like Mercedes, use proprietary technologies that only the dealership is capable of creating a brand new key fob and then resync it to your vehicle. However certain independent shops offer this service as well so make sure to review reviews and prices prior to selecting the right shop.
Some car models will wipe out all other fobs when they're reprogrammed, which means you'll need any additional fobs professionally programmed as well. This can be expensive especially if the fob is no longer working. It's always recommended to have at minimum a spare mechanical key you can use to open the doors and trunk even if it's not able to start the car.
Be prepared for a gruelling experience if you choose to reprogram your fob by yourself. There are many guides on the internet that promise success, but you'll likely be disappointed. A lot of these guides were written by individuals with no experience and are based on unsubstantiated claims. Some of them even claim that you can program your own car key fob with just a few clicks, which can be very false.
Most key fobs are held by a clip made of plastic that is easy to remove however, the battery is within the circuit board, and you'll need to carefully pry it out with a tool. You should be able find the button battery. It's typically tiny batteries for watches that is available at most home improvement or pharmacies. It's typically simple to replace the battery. Before replacing the whole unit, you can try replacing the button cell first.
Replacement
If your car key fob is damaged or has stopped working, it's important to know there are several ways to address the issue. It's as simple as replacing the battery or programming the key fob however a more extensive repair may be needed. A spare fob is helpful in the event that one is stolen or lost.
Most modern key fobs include a small physical key in addition the electronic components, making them both pricier and more complex to replace than traditional keys. Some "smart fobs" even include a remote starter. As such, it's important to know that it can take up to an hour for a replacement key fob cut and programmed to your vehicle.
Fobs utilize a small radio transmitter that is mounted on a circuit board to communicate with the car's receiver. By pressing a button, the transmitter sends an RF signal that is unique to the car's receiver. The receiver detects and compares the signal to preprogrammed codes. This allows the driver to unlock the car and start it from a distance, without inserting the key into the ignition or turning a lock.
If the buttons on your key fob aren't working or responding intermittently, they could have been damaged by water. You may be able to repair the fob by removing it and inspecting for any broken or unresponsive buttons. If this doesn't solve the problem, try reprogramming it or purchasing a new fob.
Before buying a replacement key fob online, you should contact an expert locksmith or your local dealer to confirm that it is compatible with the security system of your vehicle. There are many aftermarket fobs cheaper, but it's essential to research the brands and read reviews before attempting to program them. Certain fobs can be modified by an experienced locksmith however, other models require programming equipment that only a mechanic or dealer can utilize.