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Fiat Panda keyfobs are equipped with a transponder that sends signals from the fob to the car to unlock doors or start the motor. However, the key fob may not function due to a variety of reasons.

A dead battery for the coin is the most frequent reason for a key fob malfunction. Other causes include water damage, a faulty module, and interference signals.

Dead Coin Battery

Replace the battery if your key fob is dead. Make use of a new button battery that has the same voltage, size and specifications as the old 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. The best method is to use the paper towel and soak it in isopropyl or an electronic cleaner.

If the key fob isn't working despite being not exposed to water it could be due to a problem in the receiver module or in the internal electronic chip. In these cases you can reprogramme the key fob with an OBDII scanner might assist.

Water Damage

You could have water damage to your key fob if it was submerged in a puddle, pool or washing machine. It's usually possible to get it working again by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It is best to allow the device to completely dry before putting in a battery.

If your key fob has stopped working, even after replacing the battery and reprogramming it, you may have a defective receiver module. You can find reprogramming instructions for the majority of vehicles' remote key fobs on YouTube or in the owner's manual. You can also reset the computer of your car using the OBDII scanner tool.

Faulty Receiver Module

The key fob's chip is an electronic chip that communicates with the vehicle's system. This chip will stop sending and receiving signals to the car if damaged. A key fob falling off can cause this, as well as water exposure. If your key fob has stopped working due to exposure to water, you may be able to fix it by attempting to clean the chip with electronic cleaner or isopropyl ethanol.

If the key fob still does not respond after cleaning it, there is a good chance that the module is defective and will require to be replaced. A damaged receiver can cause the key to cease to function. This is usually due to electromagnetic interference.

Faulty Electronic Chip

The electronic chip in the key fob is a crucial component of the anti-theft system in your car. It sends a message to the immobiliser in your car that tells it whether the key is genuine. Your car will not start if the chip is damaged.

A malfunctioning chip can be caused by interference from objects, bad weather or transmitters near your vehicle. In this case you'll require an entirely new key fob.

Faulty Battery Contacts

The battery contacts of the fob's key can be damaged by heavy usage. If they're broken or bent, the fob won't send any signals to the receiver modules inside the car.

Modern fobs come with rubber seals that keep out water. A splash of water or light rain should be fine However, submerging them in salt water could harm the chip's electronic components.

The key fob is equipped with the chip that connects to the vehicle's immobilizer system in order to begin it. It uses the old red keys that were used in older vehicles, or the cryptocoding system found in newer vehicles. This chip needs to be replaced if defective.

Faulty 12 Volt Batterie

A defective battery can cause the key fob to work. The car's system will not recognize the remote when this occurs.

Before replacing the battery, test it by using a a voltmeter to determine its capacity. A fully charged battery should display 12.6 volts. If the reading decreases significantly it's time to change it.

Place an electrical load for a few seconds on the battery to test its capacity. This will take away approximately 1% of the surface charge. Then, measure the voltage once more. The higher the capacity of the battery and the longer it can maintain its voltage. It should be close to 12 volts for several minutes.

Problems with Radio Signal

This is the most common reason for keys not sending signals to the car. This issue can be fixed by replacing the battery. But, it is essential to purchase a battery that is the same size and voltage as the original one.

Fobs are subject to a lot of abuse, and they aren't impervious to destruction. The battery buttons and contacts are brittle, so they can get bent or damaged by rough use.

The signal could also be disrupted by other objects or transmitters who use the same frequency. For example, a light-control panel that is near your home could transmit interference on the same bandwidth that key fobs use. This could interfere with the remote control in your car.

Faulty OBDII Scan Tool

There are many reasons scanners don't perform. Some are more complex than others.

Professional scan tools let mechanics to observe the car's network and perform various self-tests. These are great time savers, but they are also extremely expensive, and out of the reach of most DIYers.

If your OBD2 scan tool fails to turn on, check the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If these are both present the chances are that a fuse is blowing. This is among the most frequent causes of a scan tool failing. The most straightforward fix is to replace the blown fuse.