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 an inability to function. Certain issues may require professional attention, but many 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 in hardware or auto parts stores.
Dead Battery
It can be a real issue when a key fob's battery goes out. This is especially the case when you are far from home. Fortunately, there are ways to get back on the road if your car's keyless entry doesn't work.
One of the first things you should be sure of is whether the buttons on your key fob work. If they don't, the problem could be with the locks on your car.
If your keys don't work you need to look for a key slot with a mechanical lock concealed in the trim of your door handle or somewhere else on the vehicle (consult your owner's manual). Insert the mechanical key and try again. If this doesn't unlock the door, some cars come with an application that lets you unlock it remotely. For example, the FordPass Connect app, myChevrolet mobile app, and myMazda app permit owners to open their doors using their smartphones. These apps charge a monthly fee for subscription.
It is also important to ensure whether your key fob won't drain the batteries of your car by being plugged into them. A dead fob will drain your battery fast, especially if it is used to control your phone or TV while you're watching.
Holding the key fob right to the car's start button can sometimes start an ignition key fob with an empty battery. It's a simple solution that could save you a trip to the dealership or select Interstate All Battery Center locations.
You can also determine if your key fob is actually dead by trying it in another vehicle that has push-button ignition. If it's not working the battery of the fob 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 the key fob is damaged and has a button. Your key fob is equipped with an electronic circuit that has "contact pads" which are covered by an electrically conductive film. The film wears off over time. This wear can cause your device to respond less or not at all.
The good news is that the contact pad on the car key fob is simple to replace and can be done so by using a flathead screwdriver. If the key fob is badly damaged or broken in any way, it might be more difficult to open up the case, and you'll have to take the fob to an auto shop for repair.
It's not unusual for a key fob to be dropped, trampled on or even exposed to water. All of these can cause physical damage to keys, including bending or snapping them.
This can also cause internal damage to the fob that could result in an issue. It's a good idea so, always keep a spare fob in your wallet or in your pocket in case the one you're currently using is damaged.
If your key fob's buttons aren't working in the way they should, first verify that the battery is in good condition. Remember key fob repair fobs aren't a special kind of electronic device - the majority of them use the same batteries for two dollars that are used in hearing aids and watches, which are readily available at hardware stores, drug stores, and online.
If the battery is fine it's likely that the buttons are just worn down or dirty and can be cleaned using a damp cloth to wipe them clean. If they're still not responding, you can try a different key fob to see whether the issue is related to yours or a specific kind 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 keys fobs is more complex than the myths that surround it suggest. The basic fobs operate on unique radio frequency signals that are assigned to specific vehicles. The fobs must be properly programmed to unlock and start the vehicle. Unfortunately, reprogramming a fob isn't as simple as pressing a few buttons and with a few exceptions, it has to be done by a dealer.
The procedure of reprogramming a fob depends on the make and model year of your vehicle and it's essential to refer to the owner's manual to get step-by-step instructions. Some manufacturers, such as Mercedes, use proprietary technology that guarantees only dealers can create a new fob and re-sync it to your vehicle. Some independent shops may offer this service, so make sure to check reviews and prices prior to choosing a shop.
Certain models of cars erase all other fobs once they're reprogrammed. This means that you'll need to have any extra fobs programmed by an expert. This is an expensive proposition particularly if you're down to one functioning fob. It's always wise to have at minimum a backup mechanical key that you can use to unlock the trunk and doors, even if it won't start the car.
If you attempt to reprogram your fob yourself be prepared for a difficult journey. You'll be disappointed by the countless online guides that promise success. A lot of these guides were written by people who have no experience and are based on unsubstantiated statements. Some even claim that you can program your car key fob in only a few clicks, which can be very false.
The majority of key fobs are secured by a plastic clip that's easy to loosen, however, the battery is within the circuit board, so you'll have to carefully pry it out using a tool. Once you've gotten inside, you should be able to locate the button cell battery which is typically a tiny watch battery that can be found at most pharmacies or home improvement stores. Removing the battery is typically a straightforward procedure, and it's always worth trying this first before replacing the entire device.
Replacement
There are many methods to fix a broken or damaged car key fob. It is possible to fix the problem quickly by replacing the battery or reprogramming your key fob. However it is possible that a more extensive repair may be needed. It's also beneficial to keep a spare fob in the event that one is lost or stolen.
Most modern key fobs include a small physical key in addition the electronic components they use, which makes them both more expensive and more complex to replace than traditional keys. Some "smart fobs" include a remote starter. As such, it's important to understand that it can take up to an hour to get an alternative key fob cut and programmed to your vehicle.
Fobs communicate with the car receiver by using a small radio transmitter that is mounted on the circuit board. By pressing a button the transmitter transmits an RF signal that is unique to the car's receiver. The receiver detects the signal and verifies it against the preprogrammed codes. This allows the driver to unlock the car and begin it from a distance without placing the key in the ignition or turning a lock.
If the buttons on your key fob aren't responding or working intermittently, they may have been damaged by water. You may be able to fix the fob by removing it and inspecting for any broken or non-responsive buttons. If this does not solve the problem, try reprogramming or buying an entirely new fob.
Before you purchase a replacement fob online, you should contact an expert locksmith or your local auto dealer to ensure that it's compatible with the security system of your vehicle. Fobs purchased from a third party can be cheaper but you should research brands and read reviews prior to trying to program them yourself. While some fobs can be replaced by a reputable locksmith others require specialized programming equipment that can only be used by a car dealer or auto technician.