Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder that transmits an indication from the fob to the car in order to unlock doors or start the motor. However, the fob may stop working for several reasons. A dead battery for the coin is the most common cause of a key fob malfunction. Other reasons include water damage, malfunctioning receiver modules and signal interference. Dead Coin Battery Replace the battery if your key fob has gone out of service. Make use of a button cell battery that has the same voltage, size and specifications as the previous one. If the key fob has been exposed to water, like a splash of rain or salt water at the beach, it will have to be cleaned before it is able to be used again. The best method is to use the paper towel and soak it in isopropyl or an electronic cleaner. If the key fob has not been exposed to water, but remains inoperable it could be because of a problem with the receiver module or an internal electronic chip. Reprogramming the keyfob through an OBDII scan may help in these instances. Water Damage You could have water damage to your key fob if it was submerged in a puddle, pool or washing machine. It's possible to get it working by removing the batteries and cleaning the circuit board with ruby alcohol. It is a good idea to allow the fob to dry completely before installing a new battery. If your key fob stopped working even after replacing the battery and programming it again, you might have a malfunctioning receiver module. You can find reprogramming procedures for the majority of vehicles' remote key fobs on YouTube or in the owner's manual. You could also try resetting the car's computer onboard using the OBDII scan tool. Faulty Receiver Module The key fob's chip is a chip which communicates with the vehicle's system. If the chip is damaged, it will no longer transmit or receive signals to the vehicle. This can be caused by dropping the key fob, or through exposure to water. If the key fob has stopped working after exposure to water, it may be possible to fix it by cleaning the chip with isopropyl alcohol, or electronic cleaner. However, if the key fob does not respond after cleaning it you can be sure that the receiver module is not functioning properly and will require to be replaced. A damaged receiver can cause the key to stop working. This is usually due to electromagnetic interference. A defective electronic chip The chip inside your key fob plays a crucial function in the anti-theft security system in your car. It sends a signal to the immobiliser inside your car to determine whether the key is genuine. If the chip is damaged or broken, the car won't start. A defective chip can be caused by interference signals from objects, bad weather conditions or transmitters operating on the same frequency as your vehicle. In this situation, you will need an entirely new key fob. Contacts for the battery that are damaged The battery contacts of a key fob can be damaged by excessive usage. If they are bent, or broken, the fob won't send any signals to the receiver modules inside the vehicle. Modern fobs come with rubber seals in order to keep out water. Immersing them in water, even if just small splash or drizzle could harm the chip's electronic circuit. https://www.thekeylab.co.uk/fiat-car-keys/ contains chips that communicate with the vehicle's immobilizer to allow it to activate it. The system is based on the old red keys that were used in older vehicles or the cryptocoding system found in the latest vehicles. The chip must be changed if it is defective. Faulty 12 Volt Batterie A faulty battery may cause the key fob not to work. If this happens, the car's computer system will not recognize that the remote is in the vehicle. Test the battery with a voltmeter before replacing it to determine its capacity. A fully charged battery will read 12.6 volts. If the reading drops dramatically it's time to change it. Set an electrical load for a few moments on the battery to gauge its capacity. This will eliminate approximately 1% of the surface charge. Then take another measurement of the voltage. The higher the capacity of the battery is, the longer it will keep its voltage. Ideal is to hold close to 12 volts over several minutes. Faulty Radio Signal This is the most common cause of a key fob that stops sending signals to the car. This issue can be fixed by replacing the battery. However, it is important to select a replacement battery with the same voltage and size as the original one. Fobs endure a lot of abuse, but they're not indestructible. The battery buttons and the contacts are fragile which means they could be bent or broken by the force of. The signal could also be affected by other transmitters or objects which use the same frequency. A light-control panel at your home, for instance can interfere with key fobs that have the same bandwidth. This could interfere with your car's remote control. Faulty OBDII scan tool There are many reasons why a scanner could not work. Some are more complicated than others. Professional scan tools allow mechanics to examine the car's systems and perform a variety of self-tests. These can be real time savers, but they are also extremely expensive, and out of the reach of most DIYers. If your OBD2 scan tool won't power on, check voltage at the terminals 16 (scantool power) and 4 (chassis earth). If they are all OK, a fuse may have ruptured. This is one of the most frequent causes of scan tool failure. The simple fix is usually to replace the fuse which has blown.