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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain a transponder chip which sends a signal to your car to unlock the doors or start the engine. However, the key fob may be inoperable due to various reasons. A dead coin battery is the most frequent reason for key fob malfunctions. Other causes include water damage as well as a defective module and interference signals. Dead Coin Battery If your key fob's battery has gone out of service, the first step is to replace it. Make use of a button cell battery that has the same voltage, size and specifications as your previous one. If the key fob was exposed to water (such as saltwater or rain at the beach) It must be cleaned before using again. The best method is to use an old towel soaked in isopropyl or an electronic cleaner. If the key fob is not 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 you can reprogramme the key fob with an OBDII scanner could help. Water Damage There could be water damage if your key fob was submerged in a pool, puddle or washing machine. You can usually get it working again by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It's best to allow the fob to dry completely before putting in a brand new battery. If your key fob isn't working, even after replacing the battery and reprogramming it, you may have a faulty receiver module. There are 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 with the OBDII scan tool. Faulty Receiver Module The key fob is equipped with an electronic chip that communicates with the vehicle's system. If the chip is damaged, it cannot longer transmit and receive signals to the vehicle. Dropping the key fob could cause this, as can exposure to water. If fiat 500 spare key thekeylab.co.uk stopped working after water exposure it may be possible to fix the issue by cleaning the chip with isopropyl alcohol or an electronic cleaner. If the key fob does not respond following cleaning, then it is likely that the module is defective and must be replaced. A damaged receiver can cause the key to cease to function. This usually happens due to electromagnetic interference. A malfunctioning electronic chip The electronic chip inside your key fob plays a crucial function in the anti-theft security system of your car. It transmits a message the immobiliser in your car to inform it that the key is valid. If the chip is damaged or damaged, your car will not start. A faulty chip may also be caused by interference from other objects, bad weather or transmitters located near your vehicle. In this situation an upgrade to the fob will be needed. Faulty battery contacts The battery contacts on a key fob can be damaged by heavy usage. If they're damaged or bent, the fob will not transmit any signals to the receiver modules in the car. Modern fobs are made with rubber seals that keep out water. A splash of water or light rain should be fine but submerging them into salt water could cause damage to the electronic chip. The key fob has chips that communicate with the vehicle's immobilizer system in order to begin it. The system uses the old red keys for older vehicles, or the cryptocoding system that is used in newer vehicles. This chip will need to be changed if it is faulty. A faulty 12 Volt battery A faulty battery may cause the key fob to function. If this happens, the car's computer system won't recognize that the remote is inside the vehicle. Test the battery using an voltmeter prior to replacing it to determine its capacity. A fully charged battery will display 12.6 volts. If the reading drops significantly it is time to replace the battery. To determine the capacity of a battery to determine its capacity, put an electric load on it for a couple of minutes. This will take away one percent of the surface charges. After that, measure the voltage. The higher the capacity of the battery is, the longer it will keep its voltage. Ideal is that it stays close to 12 volts for several minutes. Radio Signal Faulty Radio Signal This is the main cause of a key fob that ceases to send signals to the car. This issue can be fixed by replacing the battery. It is however important to select a replacement battery that has the same size and voltage as the original one. Fobs can take a lot abuse, but they're not indestructible. The battery buttons and contacts are brittle and are susceptible to being bent or damaged by the force of. A signal can also be interrupted by other objects or transmitters who use the same frequency. A light-control panel at your home, for instance could interfere with key fobs that use the same frequency. This can interfere with the remote control of your car. Faulty OBDII Scan Tool There are many reasons why a scan tool could not work. Some are more complicated than others. Professional scan tools allow a mechanic to examine the car's systems and run a range of self-tests. These are real time savers, however they're also expensive, and beyond the budget of most DIYers. If your OBD2 scan tool isn't turning on, check the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If both are in good condition it's likely that a fuse has been blown. This is the most frequent reason for failure of the scan tool. The most straightforward fix is to replace the blown fuse.