Fiat Panda Key Fob Replacement Fiat Panda key fobs contain transponder chips that send an alert to your car to unlock the doors or start the engine. The fob could stop working due to a variety of reasons. The most common cause of key fob malfunction is a dead coin battery. Other causes include water damage, the receiver module is defective, and signal interference. Dead Coin Battery Replace the battery if your key fob is dead. Use a button cell that has 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 must be cleaned before being used again. A paper towel that has been soaked in isopropyl alcohol or electronic cleaner can be the solution. If the key fob isn't working despite being not exposed to water, it could be due to a malfunction in the receiver module or internal electronic chip. In these instances, reprogramming the key fob using an OBDII scanner could aid. Water Damage You could have water damage to your key fob if it was submerged in a pool, puddle or washing machine. It's generally possible to get it working by removing the batteries and cleaning the circuit board with rubbing alcohol. It's a good idea to allow the fob to dry completely before putting in a brand new battery. You may have a faulty module when your key fob ceases working after replacing the battery or changing the programming. You can find the instructions for the reprogramming of most remote keys on YouTube, or consult the owner's manual. You can also try resetting the car's onboard computer using the OBDII scan tool. Faulty Receiver Module The key fob is equipped with a chip that connects to the car's system. If the chip is damaged, it can no longer send and receive signals to the vehicle. This could be due to dropping the key fob or due to exposure to water. If your key fob stopped working due to exposure to water or water exposure, you might be able fix the issue if you clean the chip using electronic cleaner or isopropyl alcohol. If the key fob doesn't respond to cleaning, it's possible that the module has an issue and must be replaced. A defective receiver can cause the key to cease to function. This is usually caused by electromagnetic interference. Faulty Electronic Chip The electronic chip inside your key fob plays a crucial role in the anti-theft system in your car. It sends a signal to the immobiliser device in your car to determine whether or not the key is genuine. If the chip is damaged or broken, the car will not start. A malfunctioning chip could be caused by interference signals from objects like bad weather conditions or transmitters operating on the same frequency close to your vehicle. In this instance, you will need an entirely new key fob. Contacts to the battery are not working properly. The battery contacts inside a key fob are very fragile and are susceptible to damage with hard usage. If they're bent, or damaged, the fob will not send any signals to receiver modules inside the vehicle. Modern fobs are designed with rubber seals that keep out water. A splash of water or a light rain should be fine however, submerging them in saltwater can damage the electronic chip. The key fob has a chip which communicates with the immobilizer system of the vehicle to start it. The system relies on cryptocoding systems in modern vehicles and the older red key system for older models. This chip will have to be replaced if damaged. A faulty 12 Volt battery A malfunctioning battery could cause the remote to cease to function. When this happens the car's computer cannot recognize that the remote is inside the vehicle. Test the battery with an voltmeter prior to replacing it to determine its capacity. A fully charged battery should read 12.6 volts. If the reading drops dramatically the time is now to replace it. Put an electrical load for a short period of time on the battery to determine its capacity. This will take off about 1 percent of the charge on the surface. Then, measure the voltage again. The longer a battery is able to hold its voltage more effectively, the greater its capacity. Ideal is that it stays close to 12 volts over several minutes. Radio Signal Faulty Radio Signal This is the main reason for the key fob to stop sending signals to the car. The battery could be replaced to fix this issue. However, it is crucial to choose a battery that is the same voltage and size as the original. https://www.thekeylab.co.uk/fiat-car-keys/ can take a lot abuse, but they're not indestructible. Contacts and buttons on batteries can be damaged through rough handling. Other transmitters or objects using the same frequency can also disrupt a signal. A light-control system in your home, for example can interfere with key fobs that use the same bandwidth. This could interfere with the remote control in your car. Problems with OBDII Scan Tool There are many reasons why a scanner might not work. Certain are more complicated than others. Professional scan tools let mechanics to monitor the car's networks and run various self-tests. These tools can save time, but they are costly and out of reach for the majority of DIYers. If your OBD2 scan tool doesn't turn on, make sure you check the voltage at terminals 16 (scantool power) and 4 (chassis earth). If both are in good condition, it's likely that a fuse has failed. This is among the most frequent causes of a scan tool failing. The easiest fix is to replace the blown fuse.