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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder which transmits a signal from the fob to the car that allows it to unlock doors or turn on the motor The fob can stop functioning due to a variety reasons The most frequent cause of key fob malfunction is a dead coin battery Other causes include water damage or a malfunctioning module and interference signals Dead Coin Battery If your key fobs battery is dead the first step is to replace it Choose a new button battery that has identical in size voltage and specifications as the previous one If the key fob was exposed to water such as saltwater or rain at the beach it must be cleaned before being used again A paper towel soaked in isopropyl alcohol or electronic cleaner will help If the key fob has not been exposed to water but remains inoperable it could be an issue with the receiver module or an internal electronic chip In these situations you can reprogramme the key fob using an OBDII scanner might assist Water Damage If your key fob took an immersion in the pool or puddle or even a trip to the washing machine you might have some water damage It is usually possible to get it working by removing the batteries and cleaning the circuit board using ruby alcohol Its best to let the fob completely dry before putting in batteries If your key fob isnt working even after replacing the battery and reconfiguring it you may have a problem with the receiver module You can find reprogramming instructions for most vehicles remote key fobs on YouTube or in the owners guide You can also reset your computer of your car using the OBDII scanner tool Faulty Receiver Module The key fob contains the chip that communicates with the vehicles system If the chip is damaged it will no longer send and receive signals to the vehicle This can be caused by dropping the key fob or through exposure to water If your key fob stopped working due to water exposure you may be able fix the issue if you clean the chip using electronic cleaner or isopropyl alcohol If the key fob doesnt respond to cleaning its possible that the component has issues and needs to be replaced A defective receiver module could also cause the remote control key to stop functioning This is usually due to electromagnetic interference Faulty Electronic Chip The electronic chip inside your key fob plays an important function in the antitheft security system of your car It transmits a signal to the immobiliser unit inside your car to inform it whether or not the key is genuine If the chip is damaged or broken your vehicle wont start A faulty chip can also be caused by interference signals from objects bad weather conditions or transmitters operating on the same frequency in close proximity to your vehicle In this case youll require an entirely new key fob Contacts of the battery may be damaged The battery contacts on the fobs battery can be damaged by heavy usage If they are bent or damaged the fob will not send any signals to receiver modules in the vehicle Modern fobs come with rubber seals to keep out water Submerging them in water even if its just small splash or drizzle could damage the chips electronic circuit The key fob is equipped with a chip that communicates with the vehicles immobilizer in order to activate it This system uses crypto coding systems in newer vehicles or the red key system in older ones This chip will need to be changed if it is damaged Faulty 12 Volt Battery A damaged battery can cause the remote to stop working When this happens the cars computer system cannot recognize that the remote is inside the vehicle Before replacing the battery you should test it with a a voltmeter to determine its capacity A fully charged battery will display 126 volts If the reading falls dramatically it is time to replace the battery To test the batterys capacity to determine its capacity put an electric load on it for a couple of minutes This will take off about 1 percent of the charge on the surface Then test the voltage again The longer the battery is able to keep its voltage steady more effectively the greater its capacity It is ideal to maintain at or near 12 volts for several minutes The radio signal is not working properly Radio Signal This is the most typical reason for a key fob that stops sending signals to the car The battery can be replaced to solve this issue It is essential to purchase a battery that has the same dimensions and voltage as the original Fobs endure a lot of abuse but theyre also not impervious to destruction The battery contacts and buttons are delicate and are susceptible to being bent or damaged from excessive use A signal can also be interrupted by other transmitters or objects that use the same frequency fiat 500 replacement key control panel at your home for instance can interfere with key fobs that have the same bandwidth This can interfere with your cars remote control Incorrect OBDII Scan Tool There are a number of reasons why a scan tool could not function Certain are more complicated than others Professional scan tools enable a mechanic observe the cars network and run various selftests These can be real time savers but they can also be very expensive and out of the reach of most DIYers If your OBD2 scan tool doesnt turn on check voltage at terminals 16 scantool power and 4 chassis earth If they are all OK a fuse may have failed This is one of the most frequent causes of scan tool failure The simple fix is usually to replace the fuse that has been blown