Car Key Fob Repair - How to Get Back on the Road Even If Your Keyless Entry isn't Working
Key fobs can experience problems over time, including the loss of functionality. Certain issues may require professional attention, but most can be resolved at home.
The first step is generally to change the battery. Most fobs are powered by flat watches-style batteries that are easily found at hardware stores or auto parts stores.
Dead Battery
It can be a major problem when the battery of a key fob goes out. This is especially the case if you are away from home. There are ways to get your vehicle back on the road in case your keyless entry system has stopped working.
The first thing you should check is if the buttons on the fob are working. If they do, the issue could be with your car's locks instead of the fob.
If the keys won't unlock you need to look for a mechanical key slot hidden in your door handle trim or on another part of the vehicle (consult the owner's manual). Insert the mechanical key and try again. If this doesn't unlock the door, some cars come with an app that allows you to unlock it remotely. For example the FordPass Connect app, myChevrolet mobile app and myMazda app allow owners to open their doors using their smartphones. These apps are charged a monthly fee for subscription.
It is also important to ensure that your key fob doesn't drain the batteries of your car by sitting on them. A dead fob can quickly drain your battery, especially if you use its remote functions while watching TV or talking on the phone.
Holding the key fob right to the car's start button could cause a key fob with an empty battery. It's a quick fix that will save you a trip to the dealer or select Interstate All Battery Center locations.
You can also determine whether your key fob actually dead by testing it in another vehicle that has the push-button ignition. If it fails, the fob battery probably needs replacement. This is why it's a good idea to keep an extra key fob in your bag or purse.
Damaged Buttons
It's possible that your key fob is damaged and has a button. The key fob has an electronic circuit that has "contact pads" which are covered by an electrically conductor film. The film wears away over time. The wear may make your fob respond slow or not respond at all.
The good news is that the pad in the key fob of a car is easy to replace, and it can be done by using a flathead screwdriver. If, however, the key fob is badly damaged or broken in any way, it might 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 common for a key fob be thrown around, trampled upon or even exposed to water. These incidents can result in physical damage, like breaking the keys and snapping them.
This could also cause internal damage to the fob and result in malfunction. This is why it's a good idea to carry an extra key fob in your purse or pocket in case you accidentally damage the one you own.
If the buttons on your key fob aren't working in the way they should, first make sure the battery is in good condition. Key fobs don't require any special electronic device. They are powered by the same two-dollar battery that is used in hearing aids and watches. These batteries are available in drug, hardware and online stores.
If the battery is in good condition, the buttons may be dirty or worn out. You can easily clean them with a damp cloth. If the buttons do not work, you could try a different car key fob. This will help you determine if the problem is yours or a particular model. If the other key fob works it is possible that yours needs to be reset or replaced.
Reprogramming
The hidden world of car keys fobs is much more complex than many myths suggest. The basic fobs operate using radio frequency signals that are assigned to specific cars. The fobs need to be programmed correctly in order for them to be able to unlock and start the car. Unfortunately it's not as simple as pressing a few buttons and with only a few exceptions it must be handled by a dealer.
The procedure of reprogramming a fob is based on the model and model year of the car you own and it's essential to consult the owner's manual for step-bystep instructions. Certain manufacturers, like Mercedes, use proprietary technology that guarantees only dealers can create the new fob and sync it to your vehicle. Some independent shops may also offer this service, so make sure to check reviews and prices before selecting a shop.
Some car models will wipe out all other fobs after they've been programmed, meaning you'll need any additional fobs professionally programmed as well. This is an expensive proposition particularly if you're down to one functioning fob. It's always recommended to have at least one spare mechanical key you can use to open the trunk and doors even if it's not able to start the car.
Be prepared for a frustrating experience if you choose to reprogram your fob yourself. You'll be disappointed with the countless online guides that claim to be successful. A lot of these guides were written by individuals with no experience and are based on unsubstantiated assertions. key fob repairs of these guides claim that you can easily program your car key fob with just a few clicks. This is misleading.
The majority of key fobs are secured by a plastic clip that is easy to remove but the battery is inside the circuit board, and you'll have to carefully pry it out with a tool. Once you've gotten inside, you should be able to locate the button cell battery which is typically a small watch battery that can be found at most pharmacies or home improvement stores. Removing the battery is typically simple, and it's always worthwhile to try this first before replacing the entire device.
Replacement
If your car key fob has been damaged or fails to function, it's important to know there are a few ways to fix the issue. A quick fix can be as easy as replacing the battery or reprogramming the key fob, however a more extensive repair might be required. A spare fob could be useful in the event one is lost or stolen.
Modern key fobs are more expensive and harder to replace due to the fact that they have an actual key as well as the electronics. Some "smart fobs" include remote starters. It's important to know that it could take an hour or more to cut and program an alternative fob for your vehicle.
Fobs make use of a tiny radio transmitter mounted on a circuit board to communicate with the car's receiver. Pressing the button triggers the transmitter, which sends an RF signal that is unique to the car's receiver. The receiver detects the signal and checks it against preprogrammed codes. This allows drivers to start the car from a distance without the need to insert the key in the ignition.
If your key fob buttons aren't responding or working intermittently, they could be damaged by water. You may be able to fix the fob by removing it and looking for any damaged or non-responsive buttons. If this doesn't resolve the problem, you can try reprogramming the fob or purchasing a new one.
You should check with a local auto dealer or a locksmith prior to purchasing a replacement keyfob online to ensure that it's compatible with the security system of your vehicle. There are a variety of aftermarket key fobs available cheaper, but it's essential to research the brands and read reviews prior to trying to program them. While certain fobs can be repaired by a trusted locksmith, others require specialized equipment to program them that can only be used by a car dealer or auto technician.