Car Key Fob Repair - How to Get Back on the Road Even If Your Keyless Entry isn't Working
Over time, key fobs can experience problems such as loss of functionality. Certain issues might require professional attention, but many are fixable at home.
Changing the battery is often the first step. Most fobs run on a flat watch-style battery, which is easily available in hardware or auto parts stores.
Dead Battery
It can be a real problem when the battery of a key fob goes out. This is particularly true when you're away from home. Fortunately, there are ways to get back on the road even when your vehicle's keyless entry system isn't working.
The first thing to test is if the buttons on the fob are still working. If they don't it could be a problem with the car's locks.
If car key repair will not unlock, there may be a mechanical slot within the trim around the door handles or in other places on your car (consult the owner's manual). Insert the mechanical key and try again. If this doesn't unlock the door, some vehicles 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 unlock their doors with their smartphones. However, these apps require a monthly cost.
You should also make sure that your key fob isn't draining your vehicle's battery by being plugged into it. A dead fob can drain your battery quickly particularly if it's used to control your phone or TV while you're watching.
Holding the key fob up to your car's start button may cause a key fob with low battery. It's a quick solution that could save you going to the dealer or even select Interstate All Battery Center locations.
If your key fob won't work You can test it in a car with a push-button starter. If it's not working, the fob battery probably needs replacement. It's a great idea to keep a spare key fob in your purse or backpack.
Damaged Buttons
It's possible that your key fob has a damaged button. Your key fob likely contains circuit boards with "contact pads" for each button, and these tiny pads are covered with an electricity conducting film which wears down over time. The wear may cause your fob to react less quickly, or not respond at all.
The contact pad on car keys can be easily replaced with the flat-head screwdriver. If the case is damaged or badly smashed, it will be difficult to open. You'll have to take it to an auto repair shop to have the fob repaired.
It's not uncommon for a key fob to be dropped on hard surfaces, walked on or exposed to water. All of these events can result in physical damage, like breaking the keys and snapping them.
This can also cause internal damage to the fob and cause an issue. It is a good idea, so, always keep an additional fob in your wallet or in your pocket in case the one you're using is damaged.
If your key fob's buttons aren't responding in the way they should, you should first check to make sure the battery is in good working condition. Key fobs don't need a special type of 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 fine it's possible that the buttons are worn down or dirty and can be cleaned using a moist cloth to clean them. If the buttons still don't work, try another car key fob. This will help you determine whether the issue is yours or an specific model. If the other key fob is working, then yours might need to be reprogrammed or replaced.
Reprogramming
The hidden world of car key fobs is more complex than some myths would suggest. The basic fobs work by using unique radio frequency signals that are assigned to specific vehicles. The fobs have to be programmed to unlock and start the vehicle. Unfortunately, reprogramming a fob isn't as simple as pressing a few buttons and with only a few exceptions it has to be done by the dealer.
The process of reprogramming a fob is based on the model and model year of your car, so it's important to refer to the owner's manual for step-by-step instructions. Some manufacturers, such as Mercedes utilize proprietary technology that ensures only the dealership can create an entirely new fob and then sync it to your vehicle. Some independent shops might offer this service, so check reviews and prices prior to selecting a shop.
Certain car models erase all other fobs after they've been changed, so you'll have to have any additional fobs professionally programmed. This can be expensive especially if the fob isn't working anymore. Even if the mechanical key won't work to start your vehicle, it's a good idea to have a backup option that can open the trunk and doors.
If you attempt to reprogram your fob yourself be prepared for a gruelling journey. You'll be disappointed with the countless online guides that promise success. Many of these guides are written by people with no experience in this area and are often founded on unsubstantiated claims. Some even claim that you can program your car key fob in only a few clicks, which is very misleading.
The battery is usually secured with a plastic clip, which can be easily removed. However, the circuit board contains the battery, and you will need to carefully remove the battery using the aid of a tool. Once you've got inside, you should be able to find the button cell battery, which is typically a tiny watch battery that is available at a variety of 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
There are many ways to fix a broken or non-functioning car key fob. An easy fix could be as simple as replacing the battery or programming the key fob however a more extensive repair may be required. It can also be helpful to have a spare key fob in case one is lost or stolen.
Modern key fobs are more expensive and more difficult to replace because they contain an actual key and electronic. Some "smart fobs" even come with a remote starter. Therefore, it's important to understand that it could take up to an hour for an alternative key fob cut and programmed for your vehicle.
Fobs make use of a tiny radio transmitter on a circuit board to communicate with the car's receiver. Pressing an appropriate button will activate the transmitter, and it transmits a unique RF signal to the car's receiver. The receiver is able to recognize and compare the signal with preprogrammed codes. This allows the driver to open the vehicle and start it from a distance without putting the key in the ignition or turning the lock.
If the buttons on the fob you have purchased fail to respond or operate intermittently it could indicate that they have been damaged by water or other causes. You can repair the fob if you take it apart and check for buttons that are not responsive or broken. If this doesn't resolve the problem, you can try reprogramming your fob or getting a new one.
It is best to check with a local auto dealer or a locksmith prior to purchasing a replacement keyfob to make sure it is compatible with the security system of your vehicle. There are many aftermarket fobs less expensive, but it's crucial to research the brands and read reviews before attempting to program them. Certain fobs can be modified by an accredited locksmith and other models require programming equipment that only a car technician or dealer is able to utilize.