Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder which transmits an indication from the fob to the car to open doors or start the motor. However, the key fob may stop working for several reasons. A dead battery for the coin is the most frequent cause of key fob malfunctions. Other causes are water damage or a malfunctioning module and interference signals. Dead Coin Battery Replace the battery if the key fob is dead. Choose a button battery with the same voltage, size and specifications as the old one. If the key fob was exposed to water (such as saltwater or rain at the beach) it should be cleaned prior to using it again. A paper towel that has been soaked in isopropyl alcohol or electronic cleaner can work wonders. If the key fob hasn't been exposed to water but it is still not working, there may be a problem with the receiver module or an internal electronic chip. Reprogramming the keyfob using an OBDII scan can help in these cases. Water Damage It is possible to get water damage if your key fob was submerged in a pool, puddle or washing machine. It's usually possible to restore it's functionality by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It's best to let the fob dry completely before putting in a brand new battery. You may have a faulty module in the event that your key fob stops working after replacing the battery or updating. Reprogramming instructions are available for the majority of vehicles' remote key fobs on YouTube or in the owner's manual. You can also try resetting the car's onboard computer with the OBDII scan tool. Faulty Receiver Module The key fob has an electronic chip that communicates with the car's system. The chip will stop sending and receiving signals to the car when it is damaged. This could be due to dropping the key fob, or due to exposure to water. If the key fob you have purchased has stopped functioning due to water exposure it is possible to fix it if you clean the chip using electronic cleaner or isopropyl ethanol. If the key fob won't respond to cleaning, it is likely that the module is in an issue and should be replaced. A malfunctioning receiver could cause the key to not work. This usually happens due to electromagnetic interference. Faulty Electronic Chip The electronic chip that is in your key fob plays a vital part in the anti-theft security system of your vehicle. It transmits a message to the immobiliser inside your car to tell it if the key is valid. If the chip is damaged or broken, the car will not start. A damaged chip could be caused by interference caused by objects, bad weather or transmitters near your vehicle. In this situation you'll require an entirely new key fob. Contacts to the battery are not working properly. The battery contacts of the key fob could be damaged through heavy use. If they're bent, or broken, the fob won't send any signals to receiver modules in the vehicle. Modern fobs have rubber seals that block out water. Immersing them in water, even if it's just an occasional drizzle or splash can harm the electronic chip. The key fob is equipped with chips that communicate with the vehicle's immobilizer system in order to begin it. The system utilizes the old red keys for older vehicles as well as the cryptocoding system that is used in newer vehicles. If the chip is defective it will have to be replaced. The 12 Volt Battery is faulty A faulty battery may cause the key fob not to work. The car's computer may not recognize the remote when this occurs. Before you replace the battery, test it by using a an voltmeter to gauge its capacity. A fully charged battery should display 12.6 volts. If the reading drops significantly, it is time to replace the battery. Put an electrical load for a short time on the battery to gauge its capacity. This will take away 1% of the surface charges. Then take another measurement of the voltage. The higher the capacity of the battery, the longer it can maintain its voltage. Ideal is that it stays close to 12 volts over several minutes. Radio Signal Faulty Radio Signal This is the most common cause of a key fob that ceases to send signals to the car. The battery can be replaced to solve this issue. It is however important to choose a battery that is the same voltage and size as the original one. Fobs can take a lot punishment, and aren't indestructible. The battery contacts and buttons could be damaged through rough handling. Other transmitters or objects using the same frequency can also interfere with the signal. For instance, a lighting control panel close to your home can transmit interference using the same frequency that key fobs utilize. This can interfere with the remote control of your car. Incorrect OBDII Scan Tool There are many reasons why a scan tool could not function. Some are more complicated than others. Professional scan tools allow mechanics to look over the car's networks and conduct a variety self-tests. They can be huge time savers, but they are also extremely expensive, and out of the range of most DIYers. If your OBD2 scan tool isn't turning on, check voltage at the terminals 16 (scantool power) and 4 (chassis earth). If both are in good condition the fuse could have been blown. This is the most frequent reason for failure of the scan tool. It is generally simple to fix the issue by replacing the fuse that was blown.