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, such as a loss of functionality. Certain issues may require professional attention, but many are fixable at home.
The battery replacement is usually the first step. Most fobs are powered by flat watch-style battery, which is easily available in hardware or auto parts stores.
Dead Battery
If the battery for a key fob is dead, it could be a major inconvenience especially if you're far from home. There are ways to get back on the road the car's keyless entry isn't working.
The first thing you should check is to see if the buttons on the key fob are still working. If they don't it could be a problem in the car's locks.
If the keys aren't unlocking try looking for a key slot with a mechanical lock concealed in your door handle trim or on another part of the car (consult the owner's manual). Insert Look At This and try again. If this fails certain cars come with an app that can unlock the doors remotely. For example the FordPass Connect app, the myChevrolet mobile app and myMazda app allow owners to unlock their doors with their smartphones. These apps do charge a monthly subscription fee.
It is also important to ensure that your key fob isn't draining your car's battery by resting on it. A dead key fob can drain your battery, particularly if you use its remote feature while watching TV or talking on the phone.
Holding the key fob up to your car's start button may cause a key fob with an empty battery. This simple fix can save you from having to visit your dealer or Interstate All Battery Centers.
If your key fob won't work, you can test it in a vehicle with an ignition button. If it doesn't work, you might need to replace the battery on your fob. This is why it's a good idea to keep a spare key fob inside a purse or backpack.
Damaged Buttons
If your key fob isn't able to open doors or start your car remotely, it's possible that one or more of its buttons have been damaged. Your key fob contains a circuit with "contact pads" which are covered by an electrically conductory film. The film wears off over time. This wear can cause your fob to react less quickly, or not at all.
The good news is that the contact pad inside the car key fob is simple to replace and it can be done using a flathead screwdriver. If the case is damaged or badly smashed, it will be difficult to open. You'll have to take it to an auto shop to get the fob repaired.
It's not uncommon for a key fob to be dropped on hard surfaces, trodden on, or exposed to water. These events can cause physical damage to keys, which could result in them breaking or snapping them.
This could also alter the internals of the fob, which could lead to an issue. It's a good idea, therefore, to always carry an additional fob in your wallet or pocket in the event that the one you're currently using breaks.
Examine the battery first to determine if your key fob buttons aren't responding like they should. Key fobs do not require any special electronic device. They use the same battery for two dollars 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 it is possible that the buttons are worn or dirty. You can easily clean them with a damp cloth. If they're still not responding, try a different type of key fob to determine whether the problem is related to yours or with a specific type of car key fob. If the other fob is working, it's likely that your key fob has to be reprogrammed or even replaced completely.
Reprogramming
The hidden world of car keys fobs is more complicated than most myths suggest. Basic fobs function using radio frequency signals that are specific to each vehicle. The fobs need to be programmed correctly in order for them to be able to unlock and start the vehicle. Reprogramming a key fob not as easy as pressing a few keys. It's usually handled by the dealer.
The process of reprogramming a fob is based on the model and model year of your car It is therefore essential to consult the owner's manual to get step-by-step instructions. Some manufacturers, such as Mercedes have their own proprietary technology that makes sure only the dealership can create the new fob and sync it to your vehicle. However certain independent shops offer this service as well, so be sure to review reviews and prices prior to choosing the right shop.
Some car models will erase other fobs when they're reprogrammed, which means you'll need to get any additional fobs programmed professionally. This is a costly proposition particularly if you're just one functional fob. Even if the mechanical key won't work to start the vehicle, it's a great idea to have a backup option that can open the doors and trunk.
If you decide to try and reprogram your fob on your own, be prepared for a difficult journey. There are numerous guides available online that promise success but you're likely to be disappointed. Many of these guides are written by people with no knowledge of this field and often are based on unsubstantiated claims. Some even claim that you can program your own car key fob in only a few clicks, which can be very confusing.
The majority of key fobs are secured by a clip made of plastic which is easy to remove, however, the battery is within the circuit board, so you'll need to carefully pry it out using a tool. Once you've gotten inside, you'll be able to locate the button cell battery, which is typically a tiny watch battery that can be purchased in most pharmacies or at home improvement stores. It's typically easy to replace the battery. Before replacing the entire unit, it's worth trying first.
Replacement
If a car key fob has been damaged or has stopped working it is important to know there are several ways to remedy the problem. It's as easy as replacing the battery or changing the program on the key fob, but a more in-depth repair might be required. It is also helpful to have a spare key fob in the event that one is lost or stolen.
Modern key fobs are more expensive and difficult to replace since they have an actual key and electronic. Some "smart fobs" even include a remote starter. It's important to understand that it can take an hour or more to cut and program an alternative fob for your vehicle.
Fobs communicate with the car receiver using a tiny radio transmitter on the circuit board. Pressing a button activates the transmitter, and it transmits an RF signal unique to the car's receiver. The receiver recognizes the signal and checks it against preprogrammed codes. This allows the driver to unlock the vehicle 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 in a sporadic manner, they may have been damaged by water. You could be able to fix the fob by taking it apart and inspecting for any broken or unresponsive buttons. If this doesn't resolve the problem, you can try reprogramming the fob, or purchasing a new one.
It is best to check with a local auto dealer or a locksmith before buying a replacement keyfob on the internet to make sure it is compatible with the security system of your vehicle. There are many aftermarket fobs cheaper, but it's important to research the brands and read reviews before attempting to program them. Certain fobs can be programmed by a locksmith who is reputable however, other models require programming equipment that only a technician in the automotive industry or dealer is able to use.
