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How to Replace a Dead Mazda 5 Key Fob Your Mazda 5 key fob has several wonderful features Certain of them enhance the safety or performance of your vehicle while others help make driving around East Stroudsburg Brodheadsville and Saylorsville easier Remote start is one of the most convenient features If you have trouble starting your car it might be time to replace the battery in your keyfob What is a key fob A key fob can be used as an remote control to lock and start your car without having to insert a metallic ignition key It is a tiny light device that contains a microchip that stores information such as an ID number that is unique and an antenna to send and receive signals The microchip communicates through radio frequencies with the receiver inside your vehicle These signals are a kind of nearfield communication NFC that permits contactless payments and other features that require proximity Depending on your key fobs design the key fob will have various capabilities Certain systems for instance keep a record of who was in the building and when This can be very useful in preventing theft Security measures can also be added like encrypted keys which make it harder to copy Prox cards are extremely popular for fobs and are also referred to as 125khz or 26bit or proximity cards You should always have a spare car key fob in the event that the original one is lost or stolen Its convenient and costeffective to program a second keyfob for yourself It is important to understand that the procedure differs from manufacturer to manufacturer and may not be straightforward You may need to do some research to find the proper instructions and steps However its worth having an authentic key fob to ensure you get to your destination safely How do you open a key fob Its a pain to discover that your Mazda key fob wont unlock Whether mazda 2 replacement key fob getting ready for your workday or returning home from an exciting day at EAA Airventure a dead key fob battery could make a mess of your plans Its easy to change the batteries in your key fob at home with a few simple tools The service team at Holiday Mazda has put together this guide to help you to open the key fob and replace the battery To begin press the button for the auxiliary key on the back of your key fob in order to remove the auxiliary metal key Once the key has been removed there should be the slots on either side of the case Carefully pry the case open by using a tapewrapped screwdriver It should come apart easily without damaging the rubber ring beneath that the battery is resting on After the battery is removed take it off and put it in a place where you wont forget about it Then place the new battery in its place ensuring that the positive side of the battery is facing upwards Close the case once the new battery has been installed making sure that both sides snap in place Youre now ready to use your Mazda key fob once more Whats the battery for the key fob Most key fobs have small coinshaped batteries that are known as button cells These batteries can be found in many places including general stores home improvement centers and auto parts stores It is important to choose the correct size of battery for your keyfob Different battery sizes have different discharge characteristics that can affect how your keyfob functions Most of the time you can determine the battery of your fob is dead by pressing any buttons on it and observing the light source that is lit by the LED If the LED light doesnt start to blink it means that the battery is dead and needs to be replaced You can also use a voltmeter to the battery to measure its voltage A fully charged key fob should display about 3 Volts If the battery shows less than that it is low and should be replaced The first step in replacing the battery is to open your key fob and find the notch that splits it into two halves You can use a screwdriver a knife or your fingers to push into this hole and push the two halves apart Once the halves are separated look for an unfastened screw in the back of the key fob and take it off Store the screw in a safe place like a resealable cup or bag to prevent losing it How do you replace the battery on the key fob Key fobs are tiny device that can be attached to the ring of your keys with buttons that allow you to lock or unlock your car and even start it remotely one of many possible secret uses for these tiny devices The fob transmits wireless signals that allow the car to perform this However these signals are powered by battery power If the battery fails or is damaged your Mazda will not be able do anything at all and that could be a major bummer Fortunately its quite easy to replace the battery with a key fob The first step is to unlock the key fob by pushing the tip of a screwdriver into the seam where the two halves snap together This seam is often an notch that allows you to easily pry the halves apart After opening the case gently pull on the key blade to let go of the old battery Put the new CR2025 batteries into position making sure that the positive side is facing up After the new battery has been installed replace the black cover piece and slide the blade in place Its a quick and easy process which can be carried out at home in Springfield The steps will differ depending on the year of your vehicle and the key fob design If you have any questions we can help you Eich Mazda is always here to assist you