Car Key Fob Repair - How to Get Back on the Road Even If Your Keyless Entry isn't Working
Over time, key fobs could experience problems such as loss of functionality. While some issues may require professional attention, the majority can be fixed at home.
The first step is typically to change the battery. Most fobs run on a flat watches-style batteries that are easily found at auto parts or hardware stores.
Dead Battery
When a key fob battery dies, it can be a major inconvenience especially if you're far from home. There are ways to get your vehicle back on the road if your keyless entry system isn't working.
One of the first things you should be sure of is to determine if the buttons on the key fob work. If they aren't then the issue could be with the locks on your car.
If your keys will not unlock, there may be a mechanical slot in the trim around your door handles or in your car (consult the owner's manual). Insert the mechanical key, and try again. If this fails certain cars come with an app that allows you to open doors remotely. FordPass Connect MyChevrolet Mobile App, myMazda apps, for example, allow owners to unlock their doors using their smartphones. However, these apps require a monthly cost.
You should also make sure that your key fob isn't draining your car's battery by resting on it. A dead fob will drain your battery quickly especially if it's used to control the TV or phone while you are watching.
A key fob that's just low on battery may be started by holding it right up to the start button. It's a simple fix that can save you going to the dealer or even select Interstate All Battery Center locations.
If your key fob does not work, you can test it in a car with an electronic starter button. If it's not working the battery of the fob needs replacement. This is why it's a good idea keep an extra key fob in your bag or purse.
Damaged Buttons
It's possible that your key fob has a damaged button. The key fob has an electronic circuit that has "contact pads" which are covered by an electrically conductory film. The film wears away over time. This wear could cause your device to respond more slowly, or even 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 may be difficult to open. You'll have to take it to an auto repair shop to repair the fob.
It's not unusual for a key fob to be thrown around, trampled upon or even exposed to water. All of these events can cause physical damage, including breaking the keys and snapping them.
This could also cause internal damage to the fob, which could cause an issue. This is why it's recommended to keep an extra key fob in your purse or pocket in case you damage the one you own.
Examine the battery first to determine If your key fob's buttons aren't working like they should. Keep in mind that key fobs aren't a special type of electronic device - they're typically powered by the same batteries for two dollars that are used in hearing aids and watches that are readily accessible at drug stores, hardware stores, and even online.
If the battery is fine it's possible that the buttons are dirty or worn out and can be cleaned using a damp cloth to clean them. If they're still not responding, test a different key fob to determine whether the issue is related to yours or with a particular type of car key fob. If the other fob is working then it's likely your key fob needs to be reprogrammed, or even replaced completely.
Reprogramming
The hidden world of car key fobs is much more complicated than the myths would suggest. Basic fobs operate on radio frequency signals unique to each car. The fobs need to be correctly programmed to unlock and start the vehicle. Reprogramming a key fob not as easy as pressing several keys. It is usually handled by the dealer.
The procedure of reprogramming a fob depends on the make and model year of the car you own, so it's important to refer to the owner's manual for step-bystep instructions. Certain manufacturers, like Mercedes, use proprietary technology that ensures only the dealership can create a new fob and re-sync it with your vehicle. Some independent shops may also offer this service, so check reviews and prices before choosing a shop.
Certain models of cars will erase other fobs after they've been changed, so you'll need any additional fobs programmed professionally. This is a costly proposition especially if you're only down to one functioning fob. Even when the mechanical key doesn't work to start your car, it's a good idea to have a backup key that can open the doors and trunk.
If you do decide to try and reprogram your fob on your own be prepared for a gruelling journey. You'll be disappointed by the numerous online guides that claim to be successful. Many of these guides are written by people who have no experience in this area, and they're often based on unsubstantiated claims. Some of these guides claim that you can program your car's key fob yourself with only a few clicks. This is false.
Most key fobs are secured by a plastic clip that's easy to loosen, however, the battery is located inside the circuit board, which means you'll need to carefully pry it out using a device. Once you get inside, you should be able locate the button cell battery which is typically a small watch battery that can be found at a variety of pharmacies or at home improvement stores. Replacing the battery is usually simple, and it's always worthwhile to try first before replacing the entire device.
Replacement
If a car key fob is damaged or has stopped working it is crucial to know that there are a few ways to remedy the problem. It's as simple as replacing the battery or reprogramming the key fob, but a more thorough repair might be required. A spare fob can be useful in the event that one is lost or stolen.
Modern key fobs are more expensive and more difficult to replace due to the fact that they have a physical key as well as the electronics. Some "smart" fobs also have a built-in remote starter. It's therefore important to understand that it can take up to an hour to get a replacement key fob cut and programmed for your vehicle.
Fobs communicate with the car's receiver by using a small radio transmitter built into the circuit board. Pressing the button triggers the transmitter, and it transmits an RF signal that is unique to the car's receiver. The receiver detects and compares the signal with preprogrammed codes. This lets the driver unlock the car and begin it from a distance, without putting the key in the ignition or turning the lock.
If key fob repairs are not responding or working intermittently, they may be damaged by water. You may be able to repair the fob by taking it apart and inspecting for any broken or non-responsive buttons. If this does not solve the issue, try reprogramming the fob or purchasing an entirely new fob.
You should check with a local auto dealer or a locksmith before purchasing a replacement keyfob online to ensure it is compatible with the security system of your vehicle. Fobs purchased from a third party can be cheaper however, you must research reviews and brands before attempting to program them yourself. While certain fobs can be repaired by a reputable locksmith, others require special equipment to program them that can only be used by a vehicle dealer or auto technician.