Car Key Fob Repair - How to Get Back on the Road Even If Your Keyless Entry isn't Working
Over time, key fobs could be affected by issues such as malfunction. Certain issues may require professional attention, however many can be fixed at home.
The first step is generally to replace the battery. Most fobs utilize flat watch-style batteries that are readily available at hardware stores or auto parts stores.
Dead Battery
When a key fob battery fails, it can be a major inconvenience especially if you're far from home. There are methods to get your vehicle back on the road in case your keyless entry system has stopped working.
The first thing to check is to see if the buttons on the key fob still work. If they don't then the issue could be with the locks on your car.
If your keys don't work try looking for a key slot with a mechanical lock concealed in the door handle trim or somewhere else on the car (consult your owner's manual). Insert the mechanical key, and try again. If this fails to unlock the door, some cars come with an application that lets you unlock the door remotely. For instance the FordPass Connect app, myChevrolet mobile app and myMazda app allow owners to open their doors with their smartphones. These apps do charge a monthly subscription fee.
Also, you should ensure that your key fob isn't draining the car's battery by resting on it. A dead fob can drain your battery fast particularly if it's used to control the TV or phone while you are watching.
A key fob that's just low on battery can be started by holding it right up to the start button. This simple fix can save you from having to visit your dealer or to certain Interstate All Battery Centers.
You can also find out whether your key fob is actually dead by testing it in another vehicle with push-button ignition. If key repair doesn't, it could be necessary to replace the battery in your fob. This is why it's a good idea keep a spare key fob in a purse or backpack.
Damaged Buttons
It is possible that your key fob is damaged and has a button. Your key fob contains a circuit with "contact pads" which are covered by an electrically conductor film. The film wears away over time. This wear can cause your device to respond more slowly, or even not respond at all.
The good news is that the pad inside a car key fob can be replaced easily, and can be done so with the help of an easy flathead screwdriver. If the case is damaged or badly damaged it will be difficult to open. You'll have to take it to an auto shop to repair the fob.
It's not unusual for keys to be dropped on hard surfaces, walked on or exposed to water. All of these can cause physical damage to the keys, including bending or snapping them.
This could also alter the internals of the fob which could result in malfunction. It is a good idea, therefore, to always carry an extra fob in your purse or pocket in the event that the one you're using is damaged.
If your key fob's buttons aren't responding as they should, you should first make sure the battery is in good working condition. Key fobs don't need any special electronic device. They use the same battery for two dollars that is used in hearing aids and watches. They are sold at drug, hardware, and online stores.
If the battery is good the buttons could be dirty or worn out. You can easily clean them using a damp cloth. If they're still not responding, you can test a different key fob to see whether the problem is with yours, or with a particular type of car key fob. If the other fob works then it's likely your key fob needs to be reprogrammed or perhaps replaced entirely.
Reprogramming
The world of fobs for car keys is more complex than many myths suggest. The basic fobs work on unique radio frequency signals that are assigned to specific cars. The fobs have to be programmed to unlock and start the vehicle. Reprogramming a key fob is not as easy as pressing several keys. It's usually 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 read the owner's manual for step-bystep instructions. Some manufacturers, such as Mercedes, use proprietary technology that makes sure only the dealership can create a new fob and re-sync it with your vehicle. Some independent shops may also offer this service, so be sure to read reviews and prices prior to selecting a shop.
Some car models will erase all other fobs after they've been reprogrammed, which means you'll have to have any additional fobs professionally programmed. This can be costly especially if the fob has stopped working. It's always wise to have a spare mechanical key that you can use to unlock the trunk and doors even if it's not able to start the car.
Be prepared for a difficult experience if you choose to reprogram your fob by yourself. You'll be disappointed by the numerous guides on the internet that claim to be successful. Many of these guides were written by people with no knowledge of this field and are often based on unsubstantiated claims. Some of them even claim that you can program your car key fob in only a few clicks, which can be very false.
The battery is usually secured with a plastic clip, which is easily removed. However, the circuit board contains the battery, and you will need to carefully pry the battery out using the aid of a tool. You should be able find the button cell battery. It's typically a small battery for watches that you can purchase at most pharmacies or at home improvement stores. It's generally easy to replace the battery. Before replacing the whole unit, it's worth trying first.
Replacement
There are many methods to fix a broken or non-functioning car key fob. It is possible to fix the problem quickly by replacing the battery or programming your key fob. However an extensive repair may be needed. A spare fob can be helpful in the event that one is stolen or lost.
Modern key fobs are more expensive and difficult to replace since they have a physical key and electronics. Some "smart" fobs include a remote starter built-in. It's important to be aware that it could take up to an hour to cut and program the replacement fob to your vehicle.
Fobs use a small radio transmitter that is mounted on a circuit board to communicate with the car's receiver. When you press a button, the transmitter sends an RF signal unique to the car receiver. The receiver recognizes and compares the signal to preprogrammed codes. This allows a driver to start the vehicle from a distance without the need to insert the key in the ignition.
If the buttons on the fob you have purchased fail to respond or function intermittently, it can indicate that they have been damaged by water or other causes. You could be able to repair the fob by disassembling it and inspecting for any broken or unresponsive buttons. If this doesn't fix the issue, try reprogramming the fob, or buying an entirely new one.
Before buying a replacement key fob online, consult a professional locksmith or your local auto dealer to make sure it's compatible with the security system of your vehicle. There are many aftermarket fobs cheaper, but it's important to study the brands and read reviews prior to trying to program them. Certain fobs can be modified by an accredited locksmith however, other models require programming equipment that only a mechanic or dealer is able to utilize.