Car Key Fob Repair - How to Get Back on the Road Even If Your Keyless Entry isn't Working
Key fobs can experience problems with time, like a loss of functionality. While some issues may require professional attention, many can be resolved at home.
Change key repair is often the first step. Most fobs run on a flat watches-style batteries that can be easily found at auto parts or hardware stores.
Dead Battery
It can be a real issue when a key fob's battery goes out. This is particularly true when you're away from home. However, there are options to get back on the road if your car's keyless entry isn't working.
One of the first things you should examine is whether the key fob's buttons still function. If they do, the issue may be in the locks of your car instead of the fob.
If your keys do not unlock, you may find an electronic slot in the trim around your door handles or elsewhere in your car (consult the owner's manual). Insert the mechanical key and try again. If this doesn't work certain cars come with an app that allows you to unlock the doors remotely. For instance the FordPass Connect app, myChevrolet mobile app and myMazda app allow owners to unlock their doors using their smartphones. These apps do charge monthly subscription fees.
It is also important to ensure that your key fob isn't draining your car's battery by being plugged into it. A dead fob will drain your battery fast especially if it's used to control your phone or TV while you are watching.
A key fob that's just low on battery can be activated by bringing it until you hit the start button. It's a quick fix that will save you going to the dealer or to select Interstate All Battery Center locations.
If your key fob doesn't work try testing it in a vehicle that has a push-button starter. If it doesn't work, you might need to replace the battery in your fob. It's a good idea to keep a spare key fob in your purse or backpack.
Damaged Buttons
If your key fob isn't able to open doors or start the car remotely, it's possible that one or more of its buttons is damaged. Your key fob contains an electronic circuit that has "contact pads" which are covered by an electrically conductor film. This film wears off over time. This wear could make your fob respond slower or not at all.
The contact pad on the car keyfob is easily replaced using the flathead screwdriver. If the case is damaged or badly damaged it may be difficult to open. It is necessary to take it to an auto shop to get the fob repaired.
It's not uncommon for a key fob being dropped, trampled, or exposed water. These incidents 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 a good idea to carry an extra key fob in your pocket or wallet in case you break the one you already have.
If the buttons on your key fob aren't responding to the extent they should, you should first verify that the battery is in good working condition. Be aware that key fobs aren't a special kind of electronic device - most of them run on the same two-dollar batteries that are used in hearing aids and watches, which are readily available at drug stores, hardware stores, and even online.
If the battery is fine, it's likely that the buttons are worn down or dirty and can be cleaned by using a damp cloth to wipe them down. If they're still not responding, try a different type of key fob to determine if the problem is related to yours or with a specific type of car key fob. If the other key fob is working it is possible that yours needs to be reset or replaced.
Reprogramming
The secret world of car key fobs is more complicated than the myths would suggest. The basic fobs operate on unique radio frequency signals that are assigned to specific cars. The fobs need to be programmed correctly to be able to unlock and start the vehicle. Unfortunately the process of reprogramming a fob isn't as simple as pressing a few buttons, and with a few exceptions, it has to be done by the dealer.
The procedure of reprogramming a fob is based on the model and model year of the car you own and it's essential to consult the owner's manual for step-by-step instructions. Some manufacturers, such as Mercedes have their own proprietary technology that guarantees only dealerships can design a new fob and re-sync it with your vehicle. However certain independent shops offer this service as well and you should check reviews and prices before choosing the shop.
Some car models will erase all other fobs when they're reprogrammed, which means you'll need to get any additional fobs professionally programmed. This is an expensive proposition, especially if you're down to just one working fob. It's always wise to have at least one backup mechanical key that you can use to open the doors and trunk even if it doesn't start the car.
If you decide to try and reprogram your fob on your own be prepared for a gruelling journey. There are numerous guides available on the internet that promise success but you're likely to be disappointed. A lot of these guides were created by people who have no prior experience in this field and often are based on unsubstantiated claims. Some of these guides claim that you can program your car key fob yourself with the click of a button. This is misleading.
The battery is usually held in place by an elastic clip that can be removed easily. However the circuit board is home to the battery, and you'll need to remove the battery using an instrument. Once you've gotten inside, you'll be able to locate the button cell battery which is typically a small watch battery that can be found in most pharmacies or home improvement stores. The replacement of the battery is generally an easy process, but it's always a good idea to test this first before replacing the entire device.
Replacement
There are several ways to fix a damaged or malfunctioning car key fob. It's as simple as replacing the battery or programming the key fob however a more extensive repair might be required. A spare fob could be useful in the event one is lost or taken.
Modern key fobs are more expensive and difficult to replace since they have an actual key as well as the electronics. Some "smart" fobs also come with a remote starter. As such, it's important to understand that it can take up to an hour to get a replacement key fob cut and programmed to your vehicle.
Fobs communicate with the car's receiver by using a small radio transmitter that is mounted on a circuitboard. Pressing an appropriate button will activate the transmitter, and it transmits a unique RF signal to the car's receiver. The receiver detects the signal and validates it against preprogrammed codes. This lets the driver unlock the car and begin it from a distance without inserting the key into the ignition or turning a lock.
If the buttons on your key fob do not respond or operate intermittently, it can indicate that they've been damaged by water or other factors. It is possible to fix the fob by removing it and examining it for broken or unresponsive buttons. If this doesn't resolve the problem, try reprogramming or buying an entirely new fob.
You should check with an auto dealer in your area or a locksmith before purchasing a replacement keyfob online to ensure that it is compatible with the security system of your vehicle. You can find aftermarket fobs cheaper, but it's important to look up the brands and read reviews prior to trying to program them. While certain fobs can be repaired by a reputable locksmith, others require specialized equipment to program them that can only be used by a car dealer or auto technician.