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Fiat Panda key fobs contain a transponder chip which sends a signal to your car to unlock the doors or start the engine. The fob may stop working due to a variety reasons.

A dead coin battery is the most common reason for key fob malfunctions. Other causes include water damage as well as a defective module and interference signals.

Dead Coin Battery

If the battery in your key fob is dead, the first step is to replace it. Use a button cell with the same voltage, size, Fiat ducato key replacement and specification as your 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. The best way to do this is using the paper towel and soak it 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 due to an issue with the receiver module or an internal electronic chip. In these situations it is possible to re-programme the key fob with an OBDII scanner might assist.

Water Damage

It is possible to get water damage if your key fob was submerged in a puddle, pool or washing machine. It's possible to get it back in working order by taking the batteries off and cleaning the circuit board with ruby alcohol. It's best to let the board completely dry prior to installing batteries.

You could have a damaged module in the event that your key fob stops working after replacing the battery or replacing it with. There are reprogramming guidelines for most remote key fobs on YouTube or in the owner's guide. You could also try resetting the car's onboard computer using the OBDII scan tool.

Faulty Receiver Module

The key fob contains the chip that communicates with the vehicle's system. If the chip is damaged, it cannot longer transmit and receive signals to the vehicle. This could be due to dropping the key fob or by water exposure. If the key fob stopped functioning after exposure to water, it could be possible to repair it by cleaning the chip using isopropyl alcohol or electronic cleaner.

If the key fob continues to not respond after cleaning it, then it is likely that the receiver module is not functioning properly and must be replaced. A malfunctioning receiver module could also cause the remote control key to stop functioning. This is typically caused by electromagnetic interference.

Faulty Electronic Chip

The electronic chip inside your key fob is a vital component of the anti-theft system in your car. It sends a message to the immobiliser in your car to inform it if the key is valid. If the chip is damaged or damaged, your car won't start.

A faulty chip can also be caused by interference signals from objects, bad weather conditions or transmitters on the same frequency in close proximity to your car. In this scenario it is likely that a new fob would be required.

Contacts of the battery may be damaged.

The battery contacts of the fob's battery can be damaged due to heavy use. If they are bent, or broken, the fob won't transmit any signals to receiver modules in the vehicle.

Modern fobs are designed with rubber seals that keep out water. Submerging them in water even if it is just an occasional drizzle or splash, can damage the electronic chip.

The key fob is equipped with chip that communicates with the immobilizer system of the vehicle to start it. The system is based on the old red keys that were used in older vehicles as well as the cryptocoding system found in modern vehicles. If the chip is not working properly it will have to be replaced.

The 12 Volt Battery is faulty

A malfunctioning battery could cause the key fob not to work. The car's system will not recognize the remote if this occurs.

Test the battery with the help of a voltmeter to determine its capacity. A fully charged battery should read 12.6 volts. If the reading drops significantly then it's time to replace it.

Put an electrical load for a few seconds on the battery to determine its capacity. This will eliminate 1% of the surface charges. After that, measure the voltage. The better the battery's capacity and the longer it can maintain its voltage. It should be at 12 volts or less for several minutes.

Faulty Radio Signal

This is the main reason for a key fob that ceases to send signals to the car. The issue can be fixed by replacing the battery. It is important to buy an identical battery dimensions and voltage as the original.

Fobs aren't impervious to damage and can withstand a lot. Battery contacts and buttons can be damaged through rough handling.

Other transmitters or objects that use the same frequency can also disrupt the signal. For instance, a light-control panel close to your home can transmit interference on the same frequency that key fobs use. This can interfere with the remote control of your car.

Faulty OBDII Scan Tool

There are a variety of reasons why scanners don't work. Certain are more complicated than others.

Professional scan tools enable mechanics to monitor the car's networks and run various self-tests. They can be huge time savers, however they are also extremely expensive and are out of the budget of many DIYers.

If your OBD2 scan tool won't power on, test the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If these are OK it's possible that a fuse has been blown. This is one of the most common causes of scan tool failure. The most straightforward fix is to replace the fuse which has blown.