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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. However, the fob can not function due to a variety of reasons.

A dead battery for the coin is the most common cause of key fob malfunctions. Other reasons include water damage, a faulty receiver module and signal interference.

Dead Coin Battery

Replace the battery if the key fob has gone out of service. Use a button cell with the same voltage, size, and specification as your old one.

If the key fob has been exposed to water, such as a splash of rain or salt water at the beach, it needs to be cleaned before it is able to be used again. The best way to do this is using the paper towel and soak it in isopropyl, or electronic cleaner.

If the key fob has not 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 through an OBDII scan can help in these cases.

Water Damage

If your key fob has taken submerged in a puddle or pool or even a trip through the washing machine, you may have some water damage. It's usually possible to restore it's functionality by removing the battery and scrubbing the circuit board with isopropyl alcohol. It's best to let the circuit board completely dry before putting in batteries.

If your key fob isn't working even after replacing the battery and reprogramming it, you may have a malfunctioning receiver module. You can find the instructions for the reprogramming of most remote keys on YouTube or refer to the owner's manual. You can also reset the computer in your car with the OBDII scanner tool.

Faulty Receiver Module

The key fob is equipped with a chip that communicates with the vehicle's system. This chip will stop sending and receiving signals to the car if damaged. Dropping the key fob can result in this, as can water exposure. If the key fob is not working after water exposure it could be possible to repair the issue by cleaning or cleaning the chip using isopropyl alcohol or an electronic cleaner.

If the key fob does not respond to cleaning, it's possible that the component has an issue and must be replaced. A malfunctioning receiver module could also cause the remote control key to cease functioning. This usually happens due to electromagnetic interference.

Faulty Electronic Chip

The chip inside your key fob plays a vital role in the anti-theft system of your car. It transmits a signal to the immobiliser unit inside your car to determine whether the key is valid. If the chip is damaged or broken, your car will not start.

A defective chip can be caused by interference signals from objects like bad weather conditions or transmitters operating on the same frequency near your car. In this instance you'll need an entirely new key fob.

Contacts for the battery that are defective

The battery contacts of a key fob are very delicate and can get damaged by repeated use. If they are bent, or broken, the fob won't transmit any signals to receiver modules inside the vehicle.

Modern fobs are equipped with rubber seals that keep out water. A splash of water or a light rain should be fine but submerging them into saltwater can damage the electronic chip.

The key fob contains a chip that communicates with the vehicle's immobilizer system to activate it. It uses the old red keys in older vehicles as well as the cryptocoding system that is used in modern vehicles. If the chip is not working properly and needs to be replaced.

Problematic 12 Volt Battery

A defective battery can cause the remote to cease working. When this happens the car's computer won't recognize that the remote is inside the vehicle.

Test the battery with a voltmeter before replacing it to determine its capacity. A fully charged battery will display 12.6 volts. If the reading drops dramatically, it's time to replace it.

To test a battery's capacity put an electrical load on it for a few minutes. This will eliminate about 1% of the surface charge. Then take another measurement of the voltage. The better the battery's capacity, the longer it can keep its voltage. Ideal is to hold close to 12 volts over several minutes.

Faulty Radio Signal

This is the main reason for keys not sending signals to a car. This issue can be resolved by replacing the battery. It is crucial to buy a battery that has the same voltage and dimensions as the original.

Fobs aren't impervious to damage and can be damaged by a lot. The battery contacts and buttons are delicate and are susceptible to being bent or damaged by rough usage.

A signal can also be impacted by other objects or transmitters which use the same frequency. A light-control panel in your home, for instance can interfere with key fobs which use the same bandwidth. This can interfere with the remote control of your car.

Faulty OBDII Scan Tool

There are many reasons why a scanner may not work. Some are more complicated than others.

Professional scan tools enable mechanics to examine the car's systems and perform a variety of self-tests. These are great time-savers, but they can also be very expensive and are out of the range of most DIYers.

If your OBD2 scanner doesn't work examine the voltage at terminal 16 (scan tool power) and terminal 4 (chassis ground). If they're both in good shape it's possible that a fuse has blown. This is among the most common causes of scan tool failure. The easiest solution is to replace the fuse that is blowing up.