Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder which transmits an electronic signal from the fob to the car to unlock doors or turn on the motor. However, the fob may stop working for several reasons. The most frequent cause of key fob failure is an inoperable coin battery. https://www.thekeylab.co.uk/fiat-car-keys/ include water damage the receiver module is defective, and signal interference. Dead Coin Battery If the battery in your key fob has failed, the initial step is to replace it. Make use of a button cell battery with the same voltage, size, and specifications as the previous one. If the key fob was exposed to water (such as rain or saltwater at the beach) it should be cleaned before being used again. The best way to do this is using an old towel soaked in isopropyl or an electronic cleaner. If the key fob has not been exposed to water but it is still not working it could be an issue with the receiver module or an internal electronic chip. In these cases it is possible that reprogramming the key fob using an OBDII scanner may aid. Water Damage It is possible to get water damage to your key fob if it was submerged in a pool, puddle or washing machine. It's usually possible to fix it by taking out the batteries and cleaning the circuit board with rubbing alcohol. It is best to let the board completely dry before putting in batteries. If your key fob stopped working, even after replacing the battery and programming it again, you might have a defective receiver module. Reprogramming instructions are available for all vehicles' remote key fobs on YouTube or in the owner's guide. You can also try resetting the car's onboard computer using the OBDII scan tool. Faulty Receiver Module The key fob contains an electronic chip that communicates with the vehicle's system. If the chip is damaged, it will no longer send and receive signals to the vehicle. A key fob falling off can result in this, as can exposure to water. If your key fob stopped functioning due to water exposure it is possible to fix it by attempting to clean the chip with electronic cleaner or isopropyl ethanol. However, if the key fob does not respond even after cleaning it you can be sure that the module is defective and must be replaced. A defective receiver module could also cause the remote control key to cease functioning. This is often caused by electromagnetic interference. Faulty Electronic Chip The electronic 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 unit inside your car to inform it whether or not the key is valid. If the chip is damaged or damaged, your car will not start. A malfunctioning chip could be caused by interference signals from objects, bad weather conditions or transmitters operating on the same frequency close to your vehicle. In this situation an upgrade to the fob will be required. Contacts to the battery are not working properly. The battery contacts on the fob's battery can be damaged due to heavy use. If they're bent, or damaged, the fob will not transmit any signals to receiver modules in the vehicle. Modern fobs are made with rubber seals in order to keep out water. Immersing them in water, even if it is just small splash or drizzle, can damage the chip's electronic components. The key fob comes with an electronic chip that communicates with the immobilizer system of the vehicle to begin it. The system uses the old red keys in older vehicles, or the cryptocoding system used in newer vehicles. If the chip is defective it will have to be replaced. A faulty 12 Volt battery A faulty battery can cause the remote to cease to function. The car's computer may not recognize the remote when this occurs. Before replacing the battery, test it using a the voltmeter to determine its capacity. A fully charged battery will display 12.6 volts. If the reading drops dramatically the time is now to replace it. To determine the capacity of a battery put an electrical load on it for a few minutes. This will remove 1% of the surface charges. Then measure the voltage again. The longer a battery is able to hold its voltage, the better its capacity. Ideal is that it stays close to 12 volts during several minutes. Radio Signal Faulty Radio Signal This is the main reason for a keyfob that stops sending signals to the car. The battery is able to be replaced to resolve this issue. However, it is crucial to buy a new battery that is the same voltage and size as the original one. Fobs take a lot of abuse, and they aren't indestructible. The battery contacts and buttons are delicate, so they can get bent or broken by excessive use. Other transmitters or objects operating on the same frequency could also disrupt the signal. A light-control panel at your home, for instance could interfere with key fobs that have the same frequency. This can interfere with the remote control of your car. Problems with OBDII Scan Tool There are many reasons scanners don't work. Some are more complicated than others. Professional scan tools enable mechanics to observe the car's networks and run various self-tests. These can be real time-savers, but they can also be very expensive, and beyond the budget of many DIYers. If your OBD2 scanner won't start, check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If they're all fine the fuse could have ruptured. This is one of the most common causes of failures in the scan tool. The easiest fix is to replace the fuse which has blown.