Car Key Repair - How to Fix a Dead Remote
Car remotes are an excellent convenience for drivers. They can unlock doors, open trunks and even start the engine. But, these remotes sometimes stop working at odd times.
Before you go to the dealer, try some quick fixes when your key fob stops functioning. These suggestions could save you money.
Keyless Entry System
There's no need to search for keys in your pockets or purse. Just walk to your car, push the button on the keyfob, and the doors will be opened and the engine will get started. It's an easy feature that makes driving a car more comfortable and safe. But, like all devices, the keyless entry system may be damaged by repeated use or because of other reasons. If you have problems with yours, you may either go to the dealer or contact a locksmith.
The way a keyless entry system works is by sending radio signals and then looking for a corresponding response signal from the key fob. If the system is able to recognize the signal, the vehicle's doors are opened and the onboard computer activated. Some systems have an additional transmitter in the trunk of the car which opens when you move a foot under it.
Each key fob comes with an unique digital identity code that's issued by the manufacturer. A proprietary technical process called "programming" is used to configure the fob with a specific car's system. This requires turning the ignition of the vehicle repeatedly in a certain sequence, and may also require pulling buttons or levers, or removing fuse.
Once the key fob is programmed into the keyless system of your car, it transmits a digital identification code as well as a function-code to instruct the car to (lock or unlock the trunk). The car's receiver verifies the transmitter's identity through an authentication and encryption process. If it is authorized, the onboard computer unlocks the vehicle and starts the engine.
A savvy criminal could steal and use the code transmitted between the keyfob and vehicle. This will require a special device that records the transmission, and then retransmits it in the event that the system doesn't want it to. To help combat this issue, the majority of keyless entry systems rely on rolling code, which ensures that each new signal from the transmitter received by the vehicle has a different counter value than the previous one.
Batteries
The most frequent reason for the car remote key fob not working is the battery is dead. It's a simple and inexpensive fix if you have an extra key fob on in your possession to replace the previous one with. Most fobs are powered by watches-style batteries, which are available at big-box stores or hardware stores for less than $10. A quick search of the internet or your car's owner's manual will provide directions on how to take apart your key fob and swap out the battery.
Be cautious not to damage any of the circuits or antennas within the case after you've removed the battery. If you do this, the key fob will become unprogrammable and may not function. If you have to move the key fobs, be cautious. Certain key fobs might come with fasteners that are able to pop out and scatter key fob pieces all over your living space.
The case of a majority of key fobs has one screwdriver hole. To open it, you can make use of a pry tool. But, to start by putting car key fob repair around the outer edge of the case as you would do when peeling an orange or apple. Don't apply too much pressure, as the case of the key fob is generally composed of plastic and it is prone to break or crack when you apply too excessive force.
Make sure you match the size and type of battery to your key fob when replacing it. Some key fobs come with two batteries while others only need one. The wrong battery can make your remote key fob useless.
If the issue persists then you can try it again with your key fob after installing the new battery. If this doesn't work, you will have to determine if the fob is suffering from a more complex issue that requires a professional diagnosis. You may need to have your key fob reset at a dealer or buy another one.
Buttons
The tiny buttons on your key fob are pretty small, and are filled with delicate electronics. It's not surprising that they fail from time-to-time. The good news is, when your car's key button isn't working, there's usually something you can do to fix it yourself.
One of the main reasons why a car key remote stops working is due to dirt or dust that has lodged between the buttons. To fix this, remove the batteries with care and clean each button using the help of a cotton swab which is dipped in rubbing alcohol. Be sure to dry the batteries completely before reinstalling them.
It's possible that your key fob is damaged in some way, such as being dropped on concrete or accidentally scratched. If that's the case, using another key fob to check its functionality could reveal that the one you have been damaged and has to be replaced.
Another possibility is that the door lock sensor in your vehicle has stopped working. The sensor is a tiny metal piece that is connected to the key fob's door lock button. It's not common for it to fail due to weather conditions or prolonged use. To reactivate the sensor simply press your key button a few times without locking or unlocking your doors to reset it.
If all else fails, you can always test the function of a spare by unlocking and locking your doors using it. If the spare key does not work, it could be necessary to locate an emergency locksmith who can provide auto key repair to get your remote operating again.
You can reprogram your computer if the car key button works but cannot lock or unlock your vehicle. But keep in mind that if you've used the same key fob for a period of time, it will have to be programmed every couple of months to ensure it remains in sync with your vehicle. It's not an ideal situation however it's much better than having to replace your remote entirely.