Car Key Fob Repair - How to Get Back on the Road Even If Your Keyless Entry isn't Working
Key fobs can experience problems over time, including an inability to function. Certain issues might require professional attention, but most can be fixed at home.
The first step is typically to replace the battery. Most fobs utilize batteries with a flat design that are readily available in hardware stores or auto parts stores.
Dead Battery
It can be an incredibly issue when a key fob's battery goes out. This is especially true if you are away from home. However, there are options to get back on the road even the 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 function. If they do, then the issue may be with the car's locks instead of the fob.
If your keys do not unlock, you may find a mechanical slot in the trim around your door handles or elsewhere on 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 open doors remotely. For example the FordPass Connect app, the myChevrolet mobile app, and myMazda app permit owners to open their doors using their smartphones. These apps charge a monthly fee for subscription.
You should also check that your key fob doesn't drain the batteries of your car by being plugged into them. A dead key fob can drain your battery quickly, especially if it is used to control the TV or phone while you are watching.
Holding the key fob towards the start button can sometimes start an ignition 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 try testing it in a vehicle that has a push-button starter. If it's not working it's likely that the battery needs replacement. It's a good idea to keep an extra key fob in your backpack or purse.
Damaged Buttons
If your key fob isn't able to open doors or start the car remotely, it's likely that one or more of its buttons are damaged. The key fob may contain a circuit board with "contact pads" for each button. These little pads are coated with an electricity conducting film which wears down over time. The wear may cause your device to respond less or not at all.
The good news is that the contact pad on the car key fob can be replaced easily, and is done using an easy flathead screwdriver. However, if the key fob is severely damaged or broken in any way, it may be more difficult to remove the case, and you'll need to take the fob to an auto repair shop for repairs.
It's not unusual for keys to be dropped on hard surfaces, tripped on, or exposed to water. All of these can cause physical damage to keys, such as bending or snapping them.
This could also cause internal damage to the fob that could result in a malfunction. It's a good idea therefore, to always carry a spare fob in your wallet or pocket in case the one you're using is damaged.
If your key fob's buttons aren't working as they should, you should first verify that the battery is in good condition. Keep in mind that key fobs don't come with a particular kind of electronic device; most of them run on the same batteries for two dollars that are used in watches and hearing aids and are available at drug stores, hardware stores, and on the internet.
If the battery is good, the buttons may be 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 if 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 has to be reset or perhaps replaced entirely.
Reprogramming
The world of car keys fobs is more complicated than most myths suggest. The basic fobs function by using unique radio frequency signals that are assigned to specific vehicles. The fobs must be programmed correctly in order for them to unlock and start the vehicle. Unfortunately it's not as simple as pressing a few buttons, and with only a few exceptions it has to be done by the dealer.
Consult your owner's guide for more detailed instructions. Certain manufacturers, like Mercedes have their own 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 check reviews and prices before choosing a shop.
Some car models will erase all other fobs once they are reprogrammed. This means you'll need to have any additional fobs programmed by an expert. car key repair cost is an expensive proposition especially if you're only down to just one working fob. Even in the event that the mechanical key will not start the vehicle, it's a great idea to have a backup that can open the doors and trunk.
If you do attempt to reprogram your fob on your own be prepared for a gruelling journey. There are numerous guides available on the internet that promise success however, you're likely to be disappointed. A lot of these guides were written by people with no experience and are based on unsubstantiated claims. Some of them even claim that you can program your car key fob with just a few clicks, which can be very confusing.
The majority of key fobs are secured by a plastic clip that's easy to loosen, however, the battery is located inside the circuit board, and you'll need to carefully pry it out using a tool. Once you get 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. It's generally easy to replace the battery. Before replacing the entire unit, it's worth trying first.
Replacement
There are a variety of methods to fix a broken or damaged car key fob. An easy fix could be as simple as replacing the battery or reprogramming the key fob, but a more in-depth repair may be required. A spare fob can be useful in the event that one is lost or stolen.
Most modern key fobs include an incredibly small physical key in addition to the electronic components which makes them more expensive and more complex to replace than traditional keys. Some "smart fobs" even include remote starters. It's important to understand that it can take up to an hour to cut and program a replacement fob for your vehicle.
Fobs communicate with the car receiver by using a small radio transmitter built into a circuitboard. By pressing a button the transmitter emits an RF signal that is unique to the car's receiver. The receiver detects and compares the signal with preprogrammed codes. This allows the driver to start the car from a distance, without the need to insert the key in the ignition.
If your key fob buttons aren't working or responding intermittently, they could have been damaged by water. It is possible to repair the fob by taking it apart and look for broken or non-responsive buttons. If this doesn't fix the issue, try reprogramming the fob, or purchasing a new one.
It is recommended to consult an auto dealer in your area or a locksmith prior purchasing a replacement keyfob to ensure that it's compatible with the security system of your vehicle. There are a variety of aftermarket key fobs available cheaper, but it's essential to research the brands and read reviews prior to attempting to program them. While some fobs are able to be replaced by a reputable locksmith other models require special equipment for programming that can only be used by a car dealer or auto technician.