Changing the Battery in Your Mini Key Fob

The key fob allows you to lock and unlock your vehicle from some distance. It also allows you to activate the panic button on your vehicle, which can deter break-ins.

If your fob stops working, it can be fixed with a few easy steps. Make sure that the battery is new. Then, try taking it from the ignition by pressing the lock button three times quickly.

Battery

The easiest way to fix your key fob's battery is to replace it. The fob has a tiny coin-shaped 3V battery (CR2032 or CR2025) which is typically easily found in general stores and home improvement stores, as well as some auto parts stores. Make sure to use a brand new battery -- old batteries are often not useful anymore and could cause damage to the circuit board.

You'll need to start by prying the fob open. It may be necessary to employ a flat screwdriver in order to break the two halves. Fit the screwdriver in the seams on both sides of the fob, and lift the clips that secure it. These are easily broken, so take your time and work slowly.

After replacing the battery replace the fob, then test it to see if everything is functioning just as it should. If it doesn't function after pressing the button multiple times, make sure the contacts are clean. You can also try it using a spare key fob in order to determine whether the issue is confined to a particular key. If not, there may be a different reason for the key fob to not function. It could be due to a worn-out button, for instance. This could cause the button to work a few times and not all the time.

Interference

The key fob is powered by a tiny transmitter that transmits an extremely short-range signal to a receiver located in your car. Its goal is to enable your car to recognize the fob and then open its doors when you are near it and start when you push the ignition button within.

The problem is, interference can sometimes interfere with the communication. If you charge your second-generation Apple Pencil while holding the fob (via iGeneration) it could block you from unlocking your vehicle.

Other electronic devices that use the same frequency as the fob could interfere with the signal. This can include garage door openers and tire-pressure monitoring systems. Even a transmitter in your home could be interfering, but this is difficult for an expert to test.

The key fob might require reprogramming. This process requires the transmitter on your fob to become recognized by the receiver in your Mini Replacement Key Fob and a specific code is used for each pairing. Fobs need to be reprogrammed after being disconnected or replaced, after you buy a new one and in some cases when the battery is replaced. To reprogram a fob follow the directions in your owner's manual or ask a dealer for assistance.

Faulty chip

Modern electronic key fobs offer convenience and functionality over traditional manual keys, but they can also be more susceptible to damage. A faulty chip is one of the most frequent issues that can prevent your key fob from functioning correctly. This is usually a straightforward fix.

If your car key fob isn't able to start up, it could be an indication of a malfunctioning chip. The issue is usually resolved by replacing the battery, which is inexpensive and easy to find at a hardware store or big-box retailer. To avoid further problems, make sure you purchase an appropriate battery for the car model you have.

It is also crucial to make sure that the fob isn't exposed to soapy or water residue. Water will often cause corrosion, which can cause problems with the circuit board. If this is the situation you'll have to clean the board with isopropyl or an electronic cleaner prior to installing an entirely new battery.

It is a good idea to test the functionality of the fob prior driving the vehicle. Check the voltage of the new battery with a voltmeter to ensure it's secure. If not, you may have to replace the entire remote chip. A trained technician from a dealership will help you determine the best solution for your vehicle.

Reprogramming

We have a new replacement mini key fob slim key fob available to replace your old one. It works exactly the same way as the original key fob. full fitting instructions are included with every order. We also offer a help line for all customers.

Often, your mini-key fob will start to malfunction or cease to function completely. This can happen due to many reasons and it can be very stressful as the car won't start and you're forced to wait until you can drive again. Reprogramming the keyfob is an easy solution.

First, make sure the battery inside your key fob is still good and hasn't been replaced. After a new key fob battery has been installed, it is not able to be changed. It will have to be replaced.

Once the key fob is programmed, it will be able to communicate with the vehicle and manage all its functions such as the radio, the air conditioning system and even the sunroof and windows. It can also activate comfort access, which implies that the doors of the driver's compartment will automatically open and close when you enter the vehicle or the seats will be moved to assist you in getting into and out. The key fob can then adjust the radio, mirrors and temperature control settings according to your preference.