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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 open the doors or start the engine. However, the fob may be inoperable due to various reasons. A dead coin battery is the most common reason for malfunctioning keys. Other causes are water damage or a malfunctioning module and interference signals. Dead Coin Battery Replace the battery in case your key fob is dead. Use a button cell that has the same voltage, size and specifications as your previous one. If the key fob was exposed to water (such as rain or saltwater at the beach) it must be cleaned prior to being used again. The trick is to use an old towel soaked in isopropyl or an electronic cleaner. If the key fob hasn't been exposed to water but still does not work it could be because of a problem with the receiver module or an internal electronic chip. Reprogramming the keyfob with an OBDII scan could help in these instances. Water Damage It is possible to get water damage if your key fob was submerged in a pool, puddle or washing machine. It is usually possible to get it back to working by taking off the battery and then scrubbing the circuit board with isopropyl alcohol. It is best to let the circuit board completely dry before installing batteries. If your key fob has stopped working, even after replacing the battery and programming it again, you might have a problem with the receiver module. You can find reprogramming procedures for most vehicles' remote key fobs on YouTube or in the owner's guide. You can also try resetting the car's onboard computer with the OBDII scan tool. Faulty Receiver Module The key fob contains the chip that communicates with the car's system. If the chip is damaged, it will no longer transmit or receive signals to the vehicle. This could be due to dropping the key fob, or by water exposure. If the key fob stops working after water exposure it could be possible to repair it by cleaning the chip with isopropyl alcohol, or electronic cleaner. However, if the key fob is still unable to not respond after cleaning it, it is likely that the receiver module is not functioning properly and must be replaced. A faulty receiver can also cause the key to not work. www.g28carkeys.co.uk is typically caused by electromagnetic interference. A defective electronic chip The electronic chip inside your key fob plays a vital role in the anti-theft system of your vehicle. It transmits a message the immobiliser in your car to inform it that the key is valid. If the chip is damaged or broken, the car will not start. A defective chip can be caused by interference signals from other objects or weather conditions that are bad, or transmitters on the same frequency as your car. In this instance the replacement fob will be needed. Contacts to the battery are not working properly. The battery contacts of a key fob are very fragile and are susceptible to damage with hard usage. If they're damaged or bent, the key fob will not be able to send any signals to the receiver modules in the car. Modern fobs feature rubber seals that block out water. Submerging them in water even if it's just the slightest splash or drizzle, can damage the electronic chip. The key fob has a chip that communicates with the vehicle's immobilizer system to activate it. This system utilizes cryptocoding systems in the latest vehicles as well as the traditional red key system for older ones. If the chip is not working properly and needs to be replaced. A faulty 12 Volt battery A malfunctioning battery could cause the key fob to work. When this happens the car's computer cannot recognize that the remote is inside the vehicle. Test the battery using the help of a voltmeter to determine its capacity. A fully charged battery should read 12.6 volts. If the reading falls significantly then it's time to replace the battery. Set an electrical load for a short period of time on the battery to test its capacity. This will eliminate one percent of the surface charges. Then, measure the voltage once more. The longer the battery is able to keep its voltage steady and the higher its capacity. It is ideal to maintain close to 12 volts for several minutes. The radio signal is not working properly. Radio Signal This is the most typical reason for the key fob not sending signals to cars. The issue can be fixed by replacing the battery. However, it is important to select a replacement battery that has the same size and voltage as the original. Fobs aren't indestructible and can be damaged by a lot. Contacts and buttons on batteries can be damaged by rough handling. A signal can also be interrupted by other objects or transmitters that use the same frequency. For example, a light-control panel that is near your home could send interference on the same bandwidth that key fobs utilize. This could interfere with your car's remote control. The tool is not working properly. OBDII scan tool There are many reasons a scanner tool may not perform. Certain 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 can be real time savers, but they're also expensive and are out of the budget of many DIYers. If your OBD2 scan tool doesn't turn on, test the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If these are OK it's likely that a fuse has been blown. This is one of the most common causes of scan tool failure. It is often easy to fix the problem by replacing the blown fuse.